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• BIOS not detecting working SATA hard drive

  - by user28927

  Some time ago my power supply died. It's a long story from then till now, but the important bit is that I ended up with a new hard drive and a new power supply. I tested to see if my original hard drive was still alive, and it booted and worked perfectly until I turned it off. When I started it again it would not boot. I bought new SATA cables, assuming that the one I had was not seating properly (it was cheap and wobbly), but no dice. Upon start-up I am presented with a message telling me to insert boot media into the selected drive or add a drive and restart. Neither the new or the old drive is detected by BIOS, my Vista install disk, or from my bootable Linux USB drive. When I remove all of the RAM the computer ceases outputting visual information, and upon reinstalling the ram and starting up again gives me a "failed overclock" error. So, does anyone have an idea as to what might be going on? I'm completely lost at this point.

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• Server not accepting uploads

  - by Tatu Ulmanen

  I'm having a strange problem with my VPS: I can download files from it, I can use PuTTy to connect to it and all behaves normally. But sometimes, when I try to upload a file to the server or save a file via SFTP, the connection inexplicably fails. I am using jEdit to edit files remotely via SFTP. When it works, it works fine. When it doesn't, I get an error message: Cannot save: java.io.IOException: inputstream is closed Cannot save: java.io.IOException: 4: I can see that a temporary save file (#file.php#save#) is created on the server with a filesize of 0. So the connection works, but when it comes to sending the actual data, something fails. The same thing with WinSCP, but the error is different: Copying file fatally failed. Copying files to remote side failed. And I can always browse the server with PuTTy without a problem. I see nothing abnormal in any log files. Auth.log shows this when I try to save: sshd[32638]: Accepted password for - from - port 62272 ssh2 sshd[32638]: pam_unix(sshd:session): session opened for user - by (uid=0) sshd[32640]: subsystem request for sftp sshd[32638]: pam_unix(sshd:session): session closed for user - When I wait for a while (say, an hour), everything works fine again. It can't be a temporary ban, as I am still allowed to connect to the server, right? I know this may not be enough info to solve the problem, but I am grateful for any clues or bits of information that might help me. What are the possible causes for this kind of behaviour, what log files can I check for clues etc.. I'm running out of ideas!

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• Advice: USB Monitoring Programming

  - by Kashif

  I need an advice about USB programming in linux. i have to design a USB monitoring program that 'll keep checking usb ports of a linux cent os. as soon as a usb or external hard disk is connected, this program will shoot an email to some specific person about detail of usb (as size, mount on, time). when usb is disconnected, it will again shoot an email to some person with same kind of information. mean while this program will also write logs in syslog/messages with name of programing for easy tracking. Now I want ask that what is best way to develop this program. as I'm new to this field so i know nothing about it? either i should use perl, bash scripting or some other language? I have no idea what is right way to adopt coz this program will keep running all the time to keep a check on usb ports. I know few commands in like lsusb, fdisk (to check attached usb) and df -h (to get detail of usb) but dont know how i can achieve using these commands that i am thinking. also one more thing that in future i also need to modify this program for ubuntu and Citrix XenServer and it should be same everywhere.

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• When upgrading from Vista to Windows 7 on a DELL laptop, how do I know which drivers to reinstall an

  - by msorens

  According to Dell's upgrade page for Vista to Windows 7, after using the upgrade assistant the final step is to install drivers. They refer to this page for the order of driver installation, listing 9 items. From there I go to the Dell Drivers and Downloads page, enter my system tag, and get a list of the downloads available for my specific box. That page, by the way, has a link to driver install instructions that lists 10 rather than 9 items. Going to Drivers Help in the side panel and clicking on "In what order should drivers be installed?" shows yet a third list, this one containing 13 items. Not surprisingly, the order of these 3 lists of drivers are not quite the same for the common items! Furthermore, of the 26 files Dell's site recommends for my machine, there are several not shown on any of the 3 lists! I can make determinations for some of these: 6 of them are "applications" so I know which of those I want and that they could probably be safely installed after all drivers. BIOS: I would think this should be unaffected by an OS upgrade so could be skipped. Two tools in the diagnostics category: could probably be done after all drivers. That leaves just a CD/DVD driver and a webcam driver unaccounted for. So my two related questions are these: How critical is the driver installation order and which one do I follow? (Keep in mind this is for an upgrade, not a fresh install.) Where in the order do I insert the CD/DVD and the webcam drivers (if needed) ? Dell's driver download page provides (in theory) the list of all downloads relevant to my specific machine, via the service tag. But do I actually need to reinstall all of them? some? none? How does one determine this? They do label each with Recommended or Optional, so do I need to reinstall all the recommended ones? (Part of the reason for my perplexed frown is that I wonder why I would need to reinstall a CD/DVD driver since I would already be using the drive to install the OS!)

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• All of the NTFS hard links damaged, where are hardlinks stored and how to recover them?

  - by String Xu

  This is Windows 7 x64 sp1 on a NTFS file system. All hardlinks within C:\Windows\System32 folder disappear, and the Windows can't boot, because even the osloader, C:\Windows\System32\boot\Winload.exe also disappeared. Nevertheless, the original files are still located in the corresponding C:\Windows\winsxs folders. After booting into the Recovery Environment, and copied one Winload.exe (x64) from other folder, Windows gave an error pointing out that "ntoskrnl.exe is corrupted or missing...its file digital signature cannot be verified" In trying to boot in Safe Mode, the message above was shown after a screen prompting "Loaded \Windows\system32\config\system" Because at this early booting stage, smss.exe was still not loaded, so there is not any dumping and logs. Based on my study, ntoskrnl.exe depends on the following files: C:\windows\system32\PSHED.DLL C:\Windows\System32\hal.dll C:\Windows\System32\kdcom.dll C:\Windows\System32\clfs.sys C:\Windows\System32\ci.dll All those files above are copied from their corresponding folders and verified their md5 with a well-operating Windows 7 x64 SP1. But the booting error is still the same: "ntoskrnl.exe is corrupted or missing..." Background: 1. Before the reboot, there was an windows update going on. Then something unknown happen, almost all processes were broken to run, including the windows task manager, taskmgr.exe. After mount the hard disk to other computer, it seems that all hardlinks within C:\Windows\System32 folder were gone. I tried several data recovery software, but they are not be able to find those disappeared NTFS hard links. So the question is: Where are information about those hard links stored? And how to recover them? Are they depend on some windows service or stored in the registry?

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• Installing 64-bit Ubuntu Server 12.04 LTS, on a VM with VMWare Player, on a 64-bit Windows 7 PC

  - by WannaBeAGeek

  I'm trying to create a VM, using VMWare Player, with an ISO image of Ubuntu Server 12.04 (LTS). The machine I'm doing the installation on has an Intel(R) Core(TM) i5 CPU, and runs 64-bit Windows 7 I managed to create the VM (gave username, password, configured network etc), but I can't install Ubuntu Server. First I get this alert : Binary translation is incompatible with long mode on this platform. Disabling long mode. Without long mode support, the virtual machine will not be able to run 64-bit code. For more details see http://vmware.com/info?id=152. When I click OK, I get another alert : This virtual machine is configured for 64-bit guest operating systems. However, 64-bit operation is not possible. This host supports Intel VT-x, but Intel VT-x is disabled. Intel VT-x might be disabled if it has been disabled in the BIOS/firmware settings or the host has not been power-cycled since changing this setting. (1) Verify that the BIOS/firmware settings enable Intel VT-x and disable 'trusted execution.' (2) Power-cycle the host if either of these BIOS/firmware settings have been changed. (3) Power-cycle the host if you have not done so since installing VMware Player. (4) Update the host's BIOS/firmware to the latest version. For more detailed information, see http://vmware.com/info?id=152. Then, when I click OK, my VM exists, and I get back to the VMWare Player home screen. I don't know much about hardware and virtualisation, so there might be some necessary info I'm not giving. Please don't hesitate to let me know what is missing in my post, for finding solutions. Thanks :)

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• IIS not responding with SSL Server Hello

  - by Damien_The_Unbeliever

  I'm having difficulty getting a particular IIS machine to "do" SSL. This is a test environment (one of many) which we've set up "the same" as we have many times previously, but it just doesn't seem to be working. The server is Windows Server 2003 (Version 5.2 (Build 3790.srv03_sp2_gdr.100216-1301 : Service Pack 2)) IIS is hosting 4 sites (including the default site), but only one site is configured for SSL. We're using the same SSL certificate we use on all of our other servers (it's a wildcard cert). (Don't think this is relevant, but including anyway) We've configured the site to require SSL, it has a subdirectory that doesn't require SSL but has an asp page that redirects into SSL. The 403;4 error page for the site is hooked up to this asp page (this is how we do our non-HTTPS into HTTPS transition). Using Microsoft Network Monitor (3.3), I've just run a session against a server where SSL is working. It can pull apart the SSL exchange as the following messages: SSL: Client Hello SSL: Server Hello. Certificate. Server Hello Done SSL: Client Key Exchange. Change Cipher Spec. Encrypted Handshake Message. SSL: Change Cipher Spec. Encrypted Handshake Message However, on our problem server, I only see: SSL: Client Hello. The next packet from the server (from port 443, so it's listening and responding there) contains only 60 bytes, and just seems to have the Tcp headers and not much else (but I'm by no means an expert at deciphering these things). So, where do I look next? Or what additional information do I need to add to this question, and where do I find it?

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• Where do vendors publish internal transfer rates of HDDs?

  - by red888

  So I've started to dig into storage fundamentals and found that in order to calculate the IOPS of a HDD you need to know the internal transfer rate of the drive (time it takes data to move from the platters to internal disk's cache). I went on newegg and even a few vendor sites and could not find this info published for any HDDs. Is it sometimes called something else? Take this link to a seagate HDD for instance. Nowhere do I see "internal transfer rate", but I do see something called "Sustained Data Rate OD"- is that the same thing? Just so you know where I'm getting this info (Book: "Information Storage and Management Storing, Managing..."): Consider an example with the following specifications provided for a disk: The average seek time is 5 ms in a random I/O environment; therefore, T = 5 ms. Disk rotation speed of 15,000 revolutions per minute or 250 revolutions per second — from which rotational latency (L) can be determined, which is one-half of the time taken for a full rotation or L = (0.5/250 rps expressed in ms). 40 MB/s internal data transfer rate, from which the internal transfer time (X) is derived based on the block size of the I/O — for example, an I/O with a block size of 32 KB; therefore X = 32 KB/40 MB. Consequently, the time taken by the I/O controller to serve an I/O of block size 32 KB is (TS) = 5 ms + (0.5/250) + 32 KB/40 MB = 7.8 ms. Therefore, the maximum number of I/Os serviced per second or IOPS is (1/TS) = 1/(7.8 × 10^-3) = 128 IOPS.

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• Log and debug/decrypt an windows application's HTTPS traffic

  - by cweiske

  I've got a proprietary windows-only application that uses HTTPS to speak with a (also proprietary, undocumented) web service. To ultimately be able to use the web service's functionality on my linux machines, I want to reverse-engineer the web service API by analyzing the requests sent by the application. Now the question: How can I decrypt and log the HTTPS traffic? I know of several solutions which don't apply in my case: Fiddler is a man-in-the-middle HTTPS proxy which I cannot use since the application doesn't support proxies. Also, I do not (yet) know if it works with self-signed server certificates, which I doubt. Wireshark is able to decrypt SSL streams if you have the server's private certificate, which I don't have. any browser extension since the application is not a browser If I remember correctly, there have been some trojans that capture online banking information by hooking into/replacing the window's crypto API. Since the machine is mine, low level changes are possible. Maybe there is a non-trojan (white-hat) network log application out there which does the same? There is a blackhat presentation with some details available to read. They refer to Microsoft Research Detour for easy API hooking.

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• SQL Server 2008 login problem with ASP.NET application: Failed to open the explicitly specified database

  - by eulerfx

  I am running SQL Server 2008 Express Edition on Windows Server 2008 with an ASP.NET application which must access the server. The ASP.NET application is associated with an application pool that runs on the NetworkService account. This account in turn has a Login and User record on SQL Server in the required database. When I attempt to run the ASP.NET website I get a blank page and when viewed in the error log, I seem to be getting this information event record: Login failed for user 'NT AUTHORITY\NETWORK SERVICE'. Reason: Failed to open the explicitly specified database. [CLIENT: myLocalMachine] The connection string has Trusted_Connection=True; and the required database specified. When I explicitly specify the user name and password I get another login error stating the password is incorrect, even though the same un/pw combination works through SQL Server Management studio. The NETWORK SERVICE account seems to have all the required privileges for the database. Also, I made a test ASP.NET website project which does a simple select from a table in that database, and using the same config file I am not getting the error and it seems to work. Is it something to do with trust levels then, because the original ASP.NET web app references various DLLs including open source libraries. Also, the application does not seem to be able to write to the event log itself, throwing a security exception, even though everything in the config files, including machine.config states the app is in full trust.

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• Can IP address transfer from person to another after he disconnects from ISP or any other way?

  - by learner

  I have been checking this website that sells a product (health related) and trying to find out if it is a scam site. The site is something.blogspot.in (and not something.blogspot.com, which happens to be a different site altogether). So is it an Indian site? It has a CBox chat box where the owner communicates with customers (or potential ones) for information. The owner shows that his product has worked for people by providing links from a forum (created by him at network54.com) where people have posted positively. One doesn't have to be registered to post on there, but the IP address of the poster gets shown along with the post. According to the owner, IP address is basis of authenticity. I found that many people had different IP addresses on their different posts. The owner has declared the nationalities of the people who posted. When I traced the IP addresses of them with this site, I found that the nationalities provided by the owner were wrong. Is it possible that when a person disconnects himself from an ISP, another person from another country gets his old IP address?

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• File Open/Save Dialog always 'Not Responding'

  - by Amanda

  I am aware that this question has been asked once, however the solution for them didn't work with me. Whenever I go to open/save a file in any program, the dialog does not come up, and the application goes to 'Not Responding'. This goes on for about a few minutes, and then stops, but still does not open the dialog. There have been a few occasions where the dialog has suddenly worked for a while, but then the problem comes back. I have tried many solutions given around the internet, I have cleaned it with CCleaner, disk defragged it, sorted the index. Nothing works. Is there anybody who has any idea what the problem is? This is Windows Vista. I'm not quite sure what kind of information you guys would need about my laptop, but I'll give you it if you need it. :) Solutions I have Tried: I have tried deleting the 'Shellicon' folder in the registry, which wasn't even in there. I have looked for mapped network drives lingering around, and I haven't come across any. I have tried rebuilding teh Widnows Search Indexes...no difference.

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• Mac updated just now, postgres now broken

  - by user52224

  I run postgres 9.1 / ruby 1.9.2 / rails 3.1.0 on a maxbook air for local dev. It's all been running smoothly for months, (though this is the first time I've done development on a mac.) It's a macbook air from last year, and today I got the mac osx software update message as I have a few times before, and my system downloaded approx 450mb of updates and restarted. It now says it's on OSX 10.7.3. Point is, postgres has stopped working, when I start my thin server (mirror heroku cedar) as normal, and then browse to my rails app I get: PG::Error could not connect to server: Permission denied Is the server running locally and accepting connections on Unix domain socket "/var/pgsql_socket/.s.PGSQL.5432"? What happened? After browsing around a few questions I'm still confused, but here's some extra info: Running psql from command line gives same error I can run pgadmin 3 and connect via it and run SQL no problems Running which psql shows the version as /usr/bin/psql I created a PostgreSQL user back when I got the mac (it's always been on lion) I've no idea why, almost certainly I was following a tutorial which I neglected to store in my notes. Point is I am aware there is a _postgres user as well. I know it's rubbish, but apart from a note on passwords, I don't have any extra info on how I configured postgres - though the obvious implication is that I did not use the _postgres user. Anyone have suggestions or information on what might have changed / what I can try to debug and fix? Thanks. Edit: Playing around based on this question and answer: http://stackoverflow.com/questions/7975414/check-status-of-postgresql-server-mac-os-x, see this string of commands: $ sudo su postgreSQL bash-3.2$ /Library/PostgreSQL/9.1/bin/pg_ctl start -D /Library/PostgreSQL/9.1/data pg_ctl: another server might be running; trying to start server anyway server starting bash-3.2$ 2012-04-08 19:03:39 GMT FATAL: lock file "postmaster.pid" already exists 2012-04-08 19:03:39 GMT HINT: Is another postmaster (PID 68) running in data directory "/Library/PostgreSQL/9.1/data"? bash-3.2$ exit

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• How to make an "import image" button/field in a PDF form?

  - by Joe

  How to make an "import image" button/field in a PDF form? I am designing a "Lost Pet" poster for a local animal shelter. The idea is to make a PDF file that users of the shelter's website can download, insert their pet's information, and then print it out if their pet goes missing. I will be designing the poster in InDesign CS3, and then exporting it to a PDF file. I will then add form fields for the user to fill out. I am ok with making text entry form fields. That is a simple matter. What's not so simple is figuring out a way to allow the user to insert a photo of their lost pet into the PDF, save the file, and then print it out with the photo in it. I am running Adobe Acrobat Professional 8. I am running it on a Mac. All of the searches I've done have told me that if I was running Acrobat in Windows, I'd have access to this other program called LiveCycle Designer which has pre-built form item libraries, including a Image Field. But I cannot find any similar option on the Mac version. Has anyone has any experience doing something like this? If so, I could certainly use some tips on making this work. Just a quick clarification... This is a volunteer design project that I am doing for the shelter, so I don't want to spend money on any extra software/addons at all. I am hoping this can be done somehow with the pre-existing software I have.

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• Known USB 2.0 devices don't install driver, but must be manually forced

  - by Darragh

  When a known USB 2.0 device is plugged in and detected, it doesn't install the driver correctly but shows a Code 28 error and lists the device under "Other Devices" in Device Manager. When view properties of this device , it shows the following status; The drivers for this device are not installed. (Code 28) There is no driver selected for the device information set or element. To find a driver for this device, click Update Driver. When updating the driver manually and selecting the appropriate driver Windows doesn't believes it's the correct driver, but you can force the installation and it works! The other condition the driver will auto-install is when the same USB device is plugged into a USB 3.0 port. Power related issues are not also causing this as I have tried vi a Docking station, USB hub. etc.. Devices tried; Jabra Headset USB-Mass Storage Device (flash disk and ext HD) MS Wireless Keyboard & Mouse USB Ethernet controller (USB-MAC controller) This is on a laptop part of a Domain with Windows 7 Ent 7601, I am logged in as a local administrator. There isn't any Group Policies blocking not signed driver or whitelisted devices on the domain. Any suggestions please feel free

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• Isolating Apache virtualhosts from the rest of the system

  - by JesperB

  I am setting up a web server that will host a number of different web sites as Apache VirtualHosts, each of these will have the possibility to run scripts (primarily PHP, possiblu others). My question is how I isolate each of these VirtualHosts from eachother and from the rest of the system? I don't want e.g. website X to read the configuration of website Y or any of the server's "private" files. At the moment I have set up the VirtualHosts with FastCGI, PHP and SUExec as described here (http://x10hosting.com/forums/vps-tutorials/148894-debian-apache-2-2-fastcgi-php-5-suexec-easy-way.html), but the SUExec only prevents users from editing/executing files other than their own - the users can still read sensitive information such as config files. I have thought about removing the UNIX global read permission for all files on the server, as this would fix the above problem, but I'm not sure if I can safely do this without disrupting the server function. I also looked into using chroot, but it seems that this can only be done on a per-server basis, and not on a per-virtual-host basis. I'm looking for any suggestions that will isolate my VirtualHosts from the rest of the system. PS I'm running Ubuntu 12.04 server

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• LdapErr: DSID-0C0903AA, data 52e: authenticating against AD '08 with pam_ldap

  - by Stefan M

  I have full admin access to the AD '08 server I'm trying to authenticate towards. The error code means invalid credentials, but I wish this was as simple as me typing in the wrong password. First of all, I have a working Apache mod_ldap configuration against the same domain. AuthType basic AuthName "MYDOMAIN" AuthBasicProvider ldap AuthLDAPUrl "ldap://10.220.100.10/OU=Companies,MYCOMPANY,DC=southit,DC=inet?sAMAccountName?sub?(objectClass=user)" AuthLDAPBindDN svc_webaccess_auth AuthLDAPBindPassword mySvcWebAccessPassword Require ldap-group CN=Service_WebAccess,OU=Groups,OU=MYCOMPANY,DC=southit,DC=inet I'm showing this because it works without the use of any Kerberos, as so many other guides out there recommend for system authentication to AD. Now I want to translate this into pam_ldap.conf for use with OpenSSH. The /etc/pam.d/common-auth part is simple. auth sufficient pam_ldap.so debug This line is processed before any other. I believe the real issue is configuring pam_ldap.conf. host 10.220.100.10 base OU=Companies,MYCOMPANY,DC=southit,DC=inet ldap_version 3 binddn svc_webaccess_auth bindpw mySvcWebAccessPassword scope sub timelimit 30 pam_filter objectclass=User nss_map_attribute uid sAMAccountName pam_login_attribute sAMAccountName pam_password ad Now I've been monitoring ldap traffic on the AD host using wireshark. I've captured a successful session from Apache's mod_ldap and compared it to a failed session from pam_ldap. The first bindrequest is a success using the svc_webaccess_auth account, the searchrequest is a success and returns a result of 1. The last bindrequest using my user is a failure and returns the above error code. Everything looks identical except for this one line in the filter for the searchrequest, here showing mod_ldap. Filter: (&(objectClass=user)(sAMAccountName=ivasta)) The second one is pam_ldap. Filter: (&(&(objectclass=User)(objectclass=User))(sAMAccountName=ivasta)) My user is named ivasta. However, the searchrequest does not return failure, it does return 1 result. I've also tried this with ldapsearch on the cli. It's the bindrequest that follows the searchrequest that fails with the above error code 52e. Here is the failure message of the final bindrequest. resultcode: invalidcredentials (49) 80090308: LdapErr: DSID-0C0903AA, comment: AcceptSecurityContext error, data 52e, v1772 This should mean invalid password but I've tried with other users and with very simple passwords. Does anyone recognize this from their own struggles with pam_ldap and AD? Edit: Worth noting is that I've also tried pam_password crypt, and pam_filter sAMAccountName=User because this worked when using ldapsearch. ldapsearch -LLL -h 10.220.100.10 -x -b "ou=Users,ou=mycompany,dc=southit,dc=inet" -v -s sub -D svc_webaccess_auth -W '(sAMAccountName=ivasta)' This works using the svc_webaccess_auth account password. This account has scan access to that OU for use with apache's mod_ldap.

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• Recommendations or advice for shared computer control

  - by Telemachus

  Basic scenario: we are a school (overwhelmingly Mac, some Windows machines via BootCamp), and we are considering using DeepFreeze to guard the state of our shared machines. We have roughly 250 machines that are either shared laptops (which move around quite a bit) or common desktops in public spaces. Obviously, we spend a lot of time maintaining the machines and trying to reverse the inevitable drift as people make changes to the computers. We would like to control the integrity of the build we initially put onto the machines without handcuffing users and especially without using Mac's Parental Control software. (We've had nothing but bad experiences with it.) We've been testing DeepFreeze, and so far it's very impressive. But I'm curious to hear if people who have used DeepFreeze or any similar software have any advice or tips. To get things started, I will post my own pros and cons. Pros: The state of the machine is frozen in our chosen state. All changes made to the machine after that disappear upon restart. (This frozen state really appears to cover everything. I have yet to do something to a test machine that isn't instantly healed.) Tons of trivial but time-consuming maintenance is gone in an instant. Also, lots of not-so-trivial breakage should be avoided. There are good options, however, that allow you to create storage spaces either globally or per user. (Otherwise, stored files disappear upon reboot. For some machines, this is a good option itself. Simply warn people: save externally or else; this machine is a kiosk, not your storage space.) Cons: Anytime we actually need to make a change (upgrade basic software, add a printer or an airport permanently, add new software), the process is a bit more complex. Reboot into a special mode (thaw state), make changes, reboot back into frozen mode. If (when?) we forget this, we will end up making changes that disappear after the next reboot. Users will forget to save files correctly (in the right place or externally), and we will have loud, unpleasant conversations explaining that we can't recover the document they worked on all afternoon yesterday. The machine rebooted. The file is gone. These are my initial thoughts, but I would love to hear from other people who have experience with DeepFreeze or any similar software. What should we be careful about? Do the pros outweigh the cons? What gains or problems am I not seeing? Thanks.

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• How to get the best LINPACK result and conquer the Top500?

  - by knweiss

  Given a large Linux HPC cluster with hundreds/thousands of nodes. What are your best practices to get the best possible LINPACK benchmark (HPL) result to submit for the Top500 supercomputer list? To give you an idea what kind of answers I would appreciate here are some sub-questions (with links): How to you tune the parameters (N, NB, P, Q, memory-alignment, etc) for the HPL.dat file (without spending too much time trying each possible permutation - esp with large problem sizes N)? Are there any Top500 submission rules to be aware of? What is allowed, what isn't? Which MPI product, which version? Does it make a difference? Any special host order in your MPI machine file? Do you use CPU pinning? How to you configure your interconnect? Which interconnect? Which BLAS package do you use for which CPU model? (Intel MKL, AMD ACML, GotoBLAS2, etc.) How do you prepare for the big run (on all nodes)? Start with small runs on a subset of nodes and then scale up? Is it really necessary to run LINPACK with a big run on all of the nodes (or is extrapolation allowed)? How do you optimize for the latest Intel/AMD CPUs? Hyperthreading? NUMA? Is it worth it to recompile the software stack or do you use precompiled binaries? Which settings? Which compiler optimizations, which compiler? (What about profile-based compilation?) How to get the best result given only a limited amount of time to do the benchmark run? (You can block a huge cluster forever) How do you prepare the individual nodes (stopping system daemons, freeing memory, etc)? How do you deal with hardware faults (ruining a huge run)? Are there any must-read documents or websites about this topic? E.g. I would love to hear about some background stories of some of the current Top500 systems and how they did their LINPACK benchmark. I deliberately don't want to mention concrete hardware details or discuss hardware recommendations because I don't want to limit the answers. However, feel free to mention hints e.g. for specific CPU models.

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• How to implement a virtual server running Ubuntu inside a fileserver in windows?

  - by user541445

  I work in a company that has some limitations regarding their budget. They need client/server aplication. I can code the aplication, I've made mini tests on primordial applications that work. The thing is that they only have fileservers, and the application they need must be concurrent compliant, so the database must be in their local network (Fileserver is the only choice). So far, I have explored almost any option available, starting with: Desktop databases. Access (We have a license)(But concurreny is just not effective, besides it's a windows software, yuck). Sqlite (Nice, but since the information they manage is a lot, I've performed some concurrency tests with INSERTs and doing SELECTS at the same time). It fails, somehow it just stops inserting. Open office Base (I dismember a base office only to see that it was a file mode HSQLDB). I've tried, not concurrent at all. Etc (You name the Open source Desktop Database manager, and yes, I've tried that one.) Server databases Call me a stubborn person, but reading some server databases documentation say that their databases will work in a file mode. I've tried a lot of products. Postgres, MySQL, FireBird, H2, Derby, Oracle Express, IBM DB2 Express, etc. So, I really need a hand here, I've been doing this install/delete/depression thing with a lot of databases for 3 weeks, until I got with a crazy idea and I just came here to express it. So, my question comes down to this: Installing a light virtual OS software like Virtual PC and then installing in there a Server OS like an Ubuntu server inside that virtual software will work? Will it work 24/7 or when I close the virtual pc software? Will this work in a fileserver? Any suggestion, answer, critic to the place I work, crazy new concurrent database that will work in fileserver will be most than welcome.

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• Mac OS X: Update Python for Shell

  - by Nathan G.

  So, I see similar questions, but none of the answers work for me. I updated Python to 3.1.3 from 2.6.1. Everything works, except: When I type python into Terminal, I get: Python 2.6.1 (r261:67515, Jun 24 2010, 21:47:49) [GCC 4.2.1 (Apple Inc. build 5646)] on darwin Type "help", "copyright", "credits" or "license" for more information. >>> So, how do I change the version of Python that runs in the Shell? I've tried the script that they provide. It adds their directory to my $PATH, but it still doesn't change the version that'd displayed from Terminal. Here's what I get when I echo $PATH: /Library/Frameworks/Python.framework/Versions/3.1/bin:/Library/Frameworks/Python.framework/Versions/3.1/bin:/Library/Frameworks/Python.framework/Versions/3.1/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/X11/bin It appears that the script provided has added their directory for every time I ran the script (I tried it a few times, naturally). I'll gives links to caps of what is in the other relevant folders it mentions: /Library/Frameworks/Python.framework/Versions/3.1/bin /usr/local/bin /usr/bin Thakns in advance for any ideas!

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• Extract sender activity from postfix logs for auditing user

  - by Aseques

  We have a mail user on our postfix server that was using the company mail to send compromising information to the competence. I've been asked to make a report of the actions for that user in the last time. There are tools like pflogsumm and others that can extract statistic data, but I haven't so far find anything useful to get all the info for a user because the data is in multiple lines. I'd like to get something like this: For the sent mail 11/11/11 00:00:00 [email protected] -> [email protected] 11/11/11 00:00:01 [email protected] -> [email protected] For the received mail 10/10/11 00:00:00 [email protected] -> [email protected] 10/10/11 00:00:01 [email protected] -> [email protected] I know I can do a script by myself, but matching the postfix ID for every mail is not something that can be made with a simple grep, and I've a lot of mail history that I have to recheck distributed among diferent files and so on. The source log is the standard postfix format, for example this one... Sep 13 16:15:57 server postfix/qmgr[18142]: B35CB5ED3D: from=<[email protected], size=10755, nrcpt=1 (queue active) Sep 13 16:15:57 server postfix/smtpd[32099]: disconnect from localhost[127.0.0.1] Sep 13 16:15:57 server postfix/smtp[32420]: 58C3E5EC9C: to=<[email protected]>, relay=127.0.0.1[127.0.0.1]:10024, delay=1.4, delays=0.01/0/0/1.4, dsn=2.0.0, status=sent (250 2.0.0 Ok, id=32697-04, from MTA([127.0.0.1]:10025): 250 2.0.0 Ok: queued as B35CB5ED3D) Sep 13 16:15:57 server postfix/qmgr[18142]: 58C3E5EC9C: removed Sep 13 16:15:57 server postfix/smtp[32379]: B35CB5ED3D: to=<[email protected]>, relay=mail.anothercompany.com[123.123.123.163]:25, delay=0.06, delays=0.03/0/0.01/0.02, dsn=2.0.0, status=sent (250 2.0.0 Ok: queued as 77D0EB6C025) Sep 13 16:15:57 server postfix/qmgr[18142]: B35CB5ED3D: removed

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• What are these isolated resource requests in Apache's access_log?

  - by Greg

  I was looking at my Apache access log and came across some strange requests. A single IP address will access several resources (mostly css style sheets and images), but no actual pages. Sometimes they are requesting a resource that no longer exists on the server, or one that is still under the web root but no longer used (e.g. a resource in an old WordPress theme). Also: The requests list no referrer I get no useful information on the IP address by looking it up There doesn't seem to be any pattern among the IP addresses that are making these requests (e.g. different countries) Are these just links from a stale cache somewhere? Could it be a sign of an attack of some sort? Here is a typical example: GET /wp-content/themes/my-theme/images/old-image.gif HTTP/1.1" 500 809 "-" "Mozilla/4.0 (compatible;)" This was one of about 10 similar requests, some for existing resources, some for older resources. There is no other sign of this IP address in access_log. Note the internal server error, which is a topic for a different thread. What I'm asking here is where would isolated requests like this come from?

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• Macros in Excel 2010 hangs

  - by Ahmad

  I have a spreadsheet with several macros. Generally, when previously using Excel 2007, a user clicks a button and everything works as expected (calculations, some email sending & file I/O). Typically, the expected run-time is about 90 seconds. The spreadsheet is a xlsm file created with Excel 2007. With Excel 2010 however, the same user process results in a non-responsive excel and forces us to kill excel from the task manager. Some note that I have gathered so far in trying to debug this issue: When monitoring CPU usage, it seems that Excel does start the macro. CPU usage increases as expected to about 47% for a few seconds. Excel.exe than drops to 0% usage and I now have a non-responsive Excel (even after 1 hour). If I set debug break points across modules and different functions and step through the code (after clicking the button) , the process works as expected albeit much slower. To add, there were no exceptions. I am at a complete loss as to what the issue may be. I initially thought it may be the add in that is being used but that was debunked by point 2. This seems to be a very odd situation. I can provide more information if required, but I'm at wits end about the root cause could be. I need help in diagnosing and resolving this issue.

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• Effects of internet connection speeds on server queries

  - by SephMerah

  Can my internet connection significantly effect queries run on phpmyadmin? I am currently 18 down and 30 up. I switched internet connections today and noticed a deep drop in query performance. The query that I am running is SELECT * FROM table. Simple. The table has one row of data. The MySQL server is on the same server as everything else. It is a VPS. Godaddy hosts. I dont have any other information. Centos 6.3 MySQL 5.1 PhpMyAdmin 3.4 Okay used google tools to inspect the XHR going out and coming in and this is what it reported. {"success":true,"message":"<div class=\"success\">Your SQL query has been executed successfully ( Query took 0.0033 sec )<\/div>","sql_query":"<div id=\"result_query\" align=\"\">\n<div class=\"success\">Your SQL query has been executed successfully ( Query took 0.0033 sec ) SNIP..................."}. So apparently my server is fine. The strange thing is though.. The returned XHR comes back exactly as soon as I execute the query on the page. It comes back within less than a second. Why PhpMyadmin does not report the change immediately. I am going to try a re-install.

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