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• Can't compile CentOS 5, Ruby 1.9.2 and OpenSSL 1.0.0c

  - by pstinnett

  I'm trying to install Ruby 1.9.2 on CentOS 5.5. I get through most of the make process, but when it tries to compile OpenSSL I get an error. Below is the errror outputted: compiling openssl make[1]: Entering directory `/sources/ruby-1.9.2-p136/ext/openssl' gcc -I. -I../../.ext/include/x86_64-linux -I../.././include -I../.././ext/openssl -DRUBY_EXTCONF_H=\"extconf.h\" -fPIC -O3 -ggdb -Wextra -Wno-unused-parameter -Wno-parentheses -Wpointer-arith -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -o ossl_x509.o -c ossl_x509.c In file included from ossl.h:201, from ossl_x509.c:11: openssl_missing.h:71: error: conflicting types for ‘HMAC_CTX_copy’ /usr/include/openssl/hmac.h:102: error: previous declaration of ‘HMAC_CTX_copy’ was here openssl_missing.h:95: error: conflicting types for ‘EVP_CIPHER_CTX_copy’ /usr/include/openssl/evp.h:459: error: previous declaration of ‘EVP_CIPHER_CTX_copy’ was here make[1]: *** [ossl_x509.o] Error 1 make[1]: Leaving directory `/sources/ruby-1.9.2-p136/ext/openssl' make: *** [mkmain.sh] Error 1 Any help would be greatly appreciated! I'm not a master at Linux by any means, but I was able to successfully install this version of Ruby on our dev server. Our live server is running a newer version of OpenSSL which I'm assuming is why it's breaking. Just not sure what the fix is!

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• WordPress: can't access WordPress.com and other external sites?

  - by Rax Olgud

  Hello, I recently started a WordPress blog using hosting at MyDomain (they offer the application "natively"). The blog works fine, however I have two plugins I can't seem to install correctly. First, the WordPress.com Stats plugin requires the API Key. When I input it, I get the following message: Error from last API Key attempt: Your blog was unable to connect to WordPress.com. Please ask your host for help. (transport error - could not open socket: 110 Connection timed out) Second, the Akismet plugin is not configured. When I go to Akismet page to insert my API key, it has the following message: There was a problem connecting to the Akismet server. Please check your server configuration. I assume the two issues are related... I approached my hosting provider about the subject and all they said is that they don't support WordPress, only provide means to install it. To clarify, up to this point I have only been able to install plugins that don't require an API key. What can I do to diagnose the problem and fix it? As a work-around, are there comparable stats and anti-spam plugins that don't require an API key? Many thanks.

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• Can compressing Program Files save space *and* give a significant boost to SSD performance?

  - by Christopher Galpin

  Considering solid-state disk space is still an expensive resource, compressing large folders has appeal. Thanks to VirtualStore, could Program Files be a case where it might even improve performance? Discovery In particular I have been reading: SSD and NTFS Compression Speed Increase? Does NTFS compression slow SSD/flash performance? Will somebody benchmark whole disk compression (HD,SSD) please? (may have to scroll up) The first link is particularly dreamy, but maybe head a little too far in the clouds. The third link has this sexy semi-log graph (logarithmic scale!). Quote (with notes): Using highly compressable data (IOmeter), you get at most a 30x performance increase [for reads], and at least a 49x performance DECREASE [for writes]. Assuming I interpreted and clarified that sentence correctly, this single user's benchmark has me incredibly interested. Although write performance tanks wretchedly, read performance still soars. It gave me an idea. Idea: VirtualStore It so happens that thanks to sanity saving security features introduced in Windows Vista, write access to certain folders such as Program Files is virtualized for non-administrator processes. Which means, in normal (non-elevated) usage, a program or game's attempt to write data to its install location in Program Files (which is perhaps a poor location) is redirected to %UserProfile%\AppData\Local\VirtualStore, somewhere entirely different. Thus, to my understanding, writes to Program Files should primarily only occur when installing an application. This makes compressing it not only a huge source of space gain, but also a potential candidate for performance gain. Testing The beginning of this post has me a bit timid, it suggests benchmarking NTFS compression on a whole drive is difficult because turning it off "doesn't decompress the objects". However it seems to me the compact command is perfectly capable of doing so for both drives and individual folders. Could it be only marking them for decompression the next time the OS reads from them? I need to find the answer before I begin my own testing.

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• Syncing Music Everywhere with Google Music and iTunes Match - Will This Work?

  - by dragonmantank

  I have the following devices: Personal Laptop running Windows 7/Ubuntu 11.10 (mostly use Ubuntu) Media Server running Windows 7 with PS3 Media Server and iTunes Work Laptop running OSX Snow Leopard iPad iPhone 4S The iPhone just replaced my Droid 2 Global. What I had been doing was using Google Music to watch the folders iTunes was storing music in and moving any new files up to Google Music. The Droid would pull music down from the cloud via streaming or me telling it to make it available offline, I had folders set up with PS3 Media Server to stream them to TV's via DLNA, and used RDP to play music through my speakers in the office. So far it's worked well. Since I've replaced the Droid 2 though with an iPhone, I've lost the syncing ability with Google Music and have to do it via iTunes (I knew this would happen, no big suprise). I got to thinking though - Apple does offer iTunes Match, which allows your devices to stream/download the music from 'the cloud,' much like Google Music. I could then listen to whatever I Wanted (for the most part) on my phone, iPad, and laptops by syncing via iTunes Match. I don't want to loose my MP3s though, and since I've never used iTunes Match, I wonder if the following is a viable solution: Sign up for iTunes Match on my media server Let it scan my library and make available my songs in AAC in the cloud Not delete the media server MP3s Set up other devices to sync to iTunes Match Continue to get MP3s via Amazon or other services and add to iTunes Let the MP3s sync to Google Music, and let the MP3's add to the AAC versions on my devices I think the main kicker is I don't want to lose the MP3 versions of my songs as those will work just fine on all my devices and I generally rip at 320kbps. I don't mind spending $25/year if it means that I can easily shift the music from device to device without much thinking, but I'm not going to pay $25/year to end up converting my library over to AAC just to save myself the hassle of manually syncing my iPad and iPhone.

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• Ionic Isapi Rewrite error on IIS6, Windows 2003 Server

  - by EsiX

  First of all my setup is a VPS running Windows 2003 Server with multiple domains on it IIS 6, Plesk IsapiRewrite4.ini RewriteLogLevel 3 RewriteCond %{HTTP_HOST} ^mydomain.com$ RewriteRule ^/(.*)$ http://www.mydomain.com/$1 [R] This is one of their basic examples. Ionic is installed and setup proper because if I use another rule (a simpler one ... like the one following) it works instant # IsapiRewrite4.ini # RewriteLogLevel 3 # # This ini file illustrates the use of a redirect rule. # Any incoming URL that starts with an uppercase W # will be redirected to the specified server. RewriteRule ^/(W.*)$ http://server.dyndns.org:7070/$1 [R] This one works in the TestDriver tool and none of them gives any error or warnings in TestParse tool, but it doesn't do a thing on the webserver... The fact that one rule works means that the isapi module works. I am using the last version. RedirectRule http://mydomain.com/someplace/somefile.html http://www.mydomain.com/howto/someplace/anotherfile.html [I,L] Both examples were taken from http://iirf.codeplex.com/Wiki/View.aspx?title=Redirection&referringTitle=Home So my IsapiRewrite4.ini needs to do this two tasks: auto transform and redirection for a number of urls. Can you help out.. I really don't know what I'm doing wrong.

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• Boot ISO image from GRUB4DOS on EFI machines

  - by Vladimir Tikhomirov

  I failed with loading ISO image (non-distro) from GRUB2 from USB stick, but found the way how I can boot the GRUB4DOS and then load the image from there. However, it doesn't work all the time and the questions is WHY it doesn't? Environment and loading process: We need to have EFI machine, USB stick, booting ISO, GRUB2 and GRUB4DOS. Last 3 on USB stick. Boot: USB - EFI loader - GRUB2 - GRUB4DOS - ISO image Configuration files To boot GRUB4DOS I use this from grub.cfg: menuentry "image.iso" { linux /syslinux/grub.exe --config-file="/menu.lst" } My menu.lst is here: timeout 20 default 0 title image.iso find --set-root --ignore-floppies --ignore-cd //image.iso map --heads=0 --sectors-per-track=0 //image.iso (hd32) map --hook chainloader (hd32) This works perfectly with Legacy machines. However, when I come to GRUB4DOS, I don't see the menu with image.iso, I see only GRUB command line. That means that my menu.lst didn't load. Why is it like this? Background and ideas I have an idea that GRUB4DOS doesn't recognize my USB stick as a device. I tried the command find and got (hd0,0), (hd0,1), (hd0,2), (rd). When I tried to set root to any of these devices I don't see fat file system, how it was with Legacy machines. The root device is (hd0,0), which has ntfs file system which should be partition with Windows. EFI machines support only GRUB2, so I can't boot GRUB4DOS straight away. Please, don't suggest anything like this, because my image doesn't have kernel. You can imagine that you load HDAT2 or Hiren's boot cd, for example. menuentry "Blancco Blancco5.iso" { set isofile="/image.iso" loopback loop $isofile set root=(loop) linux /isolinux/vmlinuz isofile=$isofile splash quiet initrd /isolinux/initrd }

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• IMAP proxy as a POP3 hub?

  - by mailman stan

  Simple scenario, complicated technology: One family receiving mail from five email addresses via POP3 into one Outlook inbox on a single PC. Now we'd like to be able to replicate that single inbox across multiple devices (eg. desktop PC, laptop, netbook, smartphone). If we continue using POP3 as the mail transfer protocol, messages will be downloaded to one device and will not be visible to the others; replies will likewise be isolated on the sending machine. If we switch to IMAP, I understand that we can have multiple devices maintaining a shared view of an inbox hosted at the server end, but what about multiple accounts? I tried changing the account configuration in Outlook to fetch from the mail providers' IMAP service instead of POP3, which does give a shared view across multiple devices but also causes Outlook to create a separate inbox and PST for each account. This is awkward because it means there are five separate folders that need to be checked, and Outlook tools like search filters and rules don't seem to work across accounts. To get what I want (five accounts delivered into one shared mailbox) it seems that I would need some sort of intervening server that collects mail (using POP3) from all our accounts into a single inbox while preserving the original destination addresses, and then serves it up to all our devices using IMAP. Is this workable? Is it a good approach? Is there an easier way?

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• ADSL throughput loss from Reed-Solomon encoding

  - by javano

  I'm reading about ADSL starting here and I am confused by how the Reed-Solomon encoding for ECC is limiting the available transfer rate, as much as it does (nearly half). This pdf on the same subject contains the following; A maximum of 255 sub-carriers can be used to modulate data in the downstream direction. Sub-carrier 256, the downstream Nyquist frequency, and sub-carrier 64, the downstream pilot frequency, are not available for user data, thus limiting the total number of available downstream sub-carriers to 254. Each of these 254 sub-carriers can support the modulation of 0 to 15 bits. Since the ADSL DMT data frame rate is 4000 frames per second, the maximum theoretical downstream data rate of an ADSL system is 15.24Mbps. Due to limitations in system architecture, specifically the maximum allowable Reed-Solomon codeword size (255 bytes), the maximum achievable downstream data rate is 8.16Mbps. How is this nearly halving the throughput? Is all that extra bandwidth overhead of the RS encoding? 15240000 bps (15.24Mbps) - 8160000 bps (8.12Mbps) = 7080000 bps (7.08Mbps). Where has that 7Mbps of throughput gone? EDIT: I tried to read the wiki page on Reed-Soloman but it's all crazy maths and algerbra, which I don't understand. I can understand that data is split into 255 byte codewords, because that maybe the max codeword size whilst still maintaining accuracy during transmission; But I don't understand why that means less data is sent?

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• Remote Scripted Installation of Sun/Oracle JRE

  - by chrisbunney

  I'm attempting to automate the installation of a Debian server (debian 6.0 squeeze 64bit). Part of the installation requires the Sun JRE package to be installed. This package has a licence agreement, which has to be accepted. I have a script which uses the following lines to accept and install the JRE: echo "sun-java6-bin shared/accepted-sun-dlj-v1-1 boolean true" | debconf-set-selections apt-get install -y sun-java6-jre This works fine when executing the script locally. However, I need to execute the script remotely using the ssh command, e.g.: ssh -i keyFile root@hostname './myScript' This doesn't work. In particular, it fails on apt-get install -y sun-java6-jre. It would seem that in spite of me setting the licence agreement to accepted, when run remotely in this manner it is ignored. Despite setting the value to true, I still get prompted to manually accept the agreement when I run this command: ssh -i keyFile root@hostname 'apt-get install -y sun-java6-jre' I suspect it is something to do with environment that is taken care of when running a proper terminal session, but have no idea what to try next to fix it. So, what do I have to do to get this command (and hence my deployment script) to run correctly when executing it remotely? Or is there an alternative way that allows me to install the JRE remotely by another means? Edit 0: I have compared the output of env when executed remotely via ssh and when executed via a local terminal session. The only difference between the outputs is that the local terminal session has the additional value TERM=xterm.

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• Force Windows Local Subnet Traffic through a Gateway

  - by Beerey

  Hi all, We are attempting to route all traffic from a certain machine to a gateway. This works ok for traffic destined for subnets outside of the machine's subnet. However, traffic to machines in the same subnet as the source machine goes through an On-Link gateway in Windows. This means that the default gateway is ignored, and traffic in a subnet (for example, 192.168.50.10 - 192.168.50.11) flows. Destination Netmask Gateway Interface Metric 192.168.50.0 255.255.255.0 On-link 192.168.50.214 276 This route can be deleted from Windows, but when the machine is rebooted it always comes back. Adding a persistant static route to the gateway with a lower metric doesn't work, since it will still try the On-Link gateway after the persistant route fails. Adding each machine in a VLAN isn't an option due to the setup we have Adding a startup script to delete the gateway isn't a great option either, since users will have full admin access to the machine and might disable the script. We cannot transperantly intercept all network traffic on the subnet using Gratuitous ARPs or transparent proxying, since there are other machines on the subnet which use a different gateway The only way we have gotten it to work is by adding a persistant route to the gateway for the subnet traffic, and deleting the On-link route on reboot. The question is then. Is there a way to permanently remove this On-link route If not, is there a way to otherwise force even local subnet traffic to go through a gateway?

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• Properly force SSL with .htaccess, no double authentication

  - by cwd

  I'm trying to force SSL with .htaccess on a shared host. This means there I only have access to .htaccess and not the vhosts config. I know you can put a rule in the VirtualHost config file to force SSL which will be picked up there (and acted upon first), preventing double authentication, but I can't get to that. Here's the progress I've made: Config 1 This works pretty well but it does force double authentication if you visit http://site.com - once for http and then once for https. Once you are logged in, it automatically redirects http://site.com/page1.html to the https coutnerpart just fine: RewriteEngine On RewriteCond %{HTTPS} !=on RewriteRule ^ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301] RewriteEngine on RewriteCond %{HTTP_HOST} !(^www\.site\.com*)$ RewriteRule (.*) https://www.site.com$1 [R=301,L] AuthName "Locked" AuthUserFile "/home/.htpasswd" AuthType Basic require valid-user Config 2 If I add this to the top of the file, it works a lot better in that it will switch to SSL before prompting for the password: SSLOptions +StrictRequire SSLRequireSSL SSLRequire %{HTTP_HOST} eq "site.com" ErrorDocument 403 https://site.com It's clever how it will use the SSLRequireSSL option and the ErrorDocument403 to redirect to the secure version of the site. My only complaint is that if you try and access http://site.com/page1.html it will redirect to https://site.com/ So it is forcing SSL without a double-login, but it is not properly forwarding non-SSL resources to their SSL counterparts. Regarding the first config, Insyte mentioned "using mod_rewrite to perform a simple redirect is a bit of overkill. Use the Redirect directive instead. It's possible this may even fix your problem, as I believe mod_rewrite rules are some of the last directives to be processed, just before the file is actually grabbed from the filesystem" I have not had no such luck on finding a force-ssl config option with the redirect directive and so have been unable to test this theory.

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• How do I force Windows 7 to recognize my Projector?

  - by user63564

  I have a new Dell XPS with an NVIDIA GeForce GT 445M and an old (several years) Epson PowerLite Cinema 550 projector. Windows 7 refuses to recognize that the projector is connected under normal conditions (I'll get to the strange condition in a moment). Here are some things that I have already tried: Confirm that the projector continues to work well on my old Windows XP laptop. Confirm that the video cable (HDMI to HDMI) is connected Make sure the Dell laptop is plugged in to wall power at all times Reboot both the computer and the projector Click "Detect" under the "Connect to an External Display" Windows dialog (no reaction) Click "Rigorous Display Detection" under NVIDIA Control Panel (dialog: none found) Checked "Force Television Detection on startup" under "My display is not shown..." in NVIDIA Control Panel (no effect) Here's where it gets weird... My projector has three states: off, standby and on. Standby means the power switch on the back is on, but the projector is effectively off (no picture, no access to menu or controls). When I plug in the HDMI cable while the projector is in standby, Windows detects the projector! It lets me switch to Duplicate, Extend, or Project Only mode, and adjusts the resolution appropriately. A new Generic Plug-n-Play monitor shows up in my device manager. A "Seiko EPSON PJ" display shows up in my NVIDIA control panel. Then if I turn my projector on, Windows no longer recognizes the display. This is true whether I turn the projector on while the HDMI cable is plugged in, or if I unplug the HDMI cable while turning on the projector. Anyone have any ideas, because I'm completely stumped...?

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• Performance of file operations on thousands of files on NTFS vs HFS, ext3, others

  - by peterjmag

  [Crossposted from my Ask HN post. Feel free to close it if the question's too broad for superuser.] This is something I've been curious about for years, but I've never found any good discussions on the topic. Of course, my Google-fu might just be failing me... I often deal with projects involving thousands of relatively small files. This means that I'm frequently performing operations on all of those files or a large subset of them—copying the project folder elsewhere, deleting a bunch of temporary files, etc. Of all the machines I've worked on over the years, I've noticed that NTFS handles these tasks consistently slower than HFS on a Mac or ext3/ext4 on a Linux box. However, as far as I can tell, the raw throughput isn't actually slower on NTFS (at least not significantly), but the delay between each individual file is just a tiny bit longer. That little delay really adds up for thousands of files. (Side note: From what I've read, this is one of the reasons git is such a pain on Windows, since it relies so heavily on the file system for its object database.) Granted, my evidence is merely anecdotal—I don't currently have any real performance numbers, but it's something that I'd love to test further (perhaps with a Mac dual-booting into Windows). Still, my geekiness insists that someone out there already has. Can anyone explain this, or perhaps point me in the right direction to research it further myself?

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• How does a vsftpd server work and how to configure it?

  - by ysap

  I was asked to configure a FTP server, based on the vsftpd package. The server is running on a remote machine to which I have a superuser privilege access. Being unfamiliar with the mechanics of FTP servers, I tried to figure out how user ftp accounts are configured. The previous maintainer used a shell script, which works on a list that we maintain to track users accounts and passwords, to configure the ftp accounts. From reading the script, I see that he generates a list of usernames and passwords, and actually creates a user account on the Linux machine. This means that for each user that we configure in the list, a new user account is being added by the adduser command: adduser --home /home/ftp --no-create-home $user (but w/o a private /home/username directory - using the /home/ftp instaed). Each of these users can log into his account using the ssh command. This fact seems a little strange to me, as I'd think that the ftp account should be decoupled from the Ubuntu user accounts. As another side effect, when a user connects using a web browser, he is connected to the /home/ftp directory. However, he can then use "Up to a higher level directory" link to go up and effectively have access to all of our system. So, the questions are: Is this really how the FTP server supposed to work in terms of configuring ftp accounts? If not, how do I configure the vsftpd server in a way that I have only the superuser Ubuntu account on that machine and all ftp account are... just FTP user accounts? Additionally, these ftp account should be configured in terms of how and what they are allowed to access.

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• DCOM configuration: accounts with same name but different passwords problem

  - by archimed7592

  Hello, everybody! I'm experiencing troubles with DCOM configuration. Here is the case: I'm using some product which supports client-server interaction through DCOM, but the client won't get any access to the server if the attempt is being done from an account with a name which exists at the server as well, but has different password. Basically, if we try to access the server from the Administrator account which obviously present on the server machine, we will fail if client's Administrator password doesn't match server's one. After actively collaborating with the product's developer in attempts to localize the issue, he come across with resolution "can't be fixed" or, if you prefer to call a pikestaff a pikestaff than it's more likely a "don't know how to fix" resolution :). I believe there is a solution for this problem and I'm asking you, IT professionals, to help me out with this one. I do realize that the problem may be caused by the way the developer interact with DCOM and if so it can't be fixed be means of pure system configuration and the question should be asked at SO, but since I've bumped into the same behavior while working with file/printer sharing - Windows tried to simplify everything and used currently impersonated credentials to access the share, I hope the solution lies at system configuration layer. P.S. I believe that the actual software product I'm talking about is entirely irrelevant however my experience tell me that there always would be somebody who will think that it on the contrary is very relevant. Here it is: SpRecord.

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• Could not continue scan with NOLOCK due to data movement during installation

  - by dbdev1

  Hi, I am running Windows Server 2008 Standard Edition R2 x64 and I installed SQL Server 2008 Developer Edition. All of the preliminary checks run fine (Apart from a warning about Windows Firewall and opening ports which is unrelated to this and shouldn't be an issue - I can open those ports). Half way through the actual installation, I get a popup with this error: Could not continue scan with NOLOCK due to data movement. The installation still runs to completion when I press ok. However, at the end, it states that the following services "failed": database engine services sql server replication full-text search reporting services How do I know if this actually means that anything from my installation (which is on a clean Windows Server setup - nothing else on there, no previous SQL Servers, no upgrades, etc) is missing? I know from my programming experience that locks are for concurrency control and the Microsoft help on this issue points to changing my query's lock/transactions in a certain way to fix the issue. But I am not touching any queries? Also, now that I have installed the app, when I login, I keep getting this message: TITLE: Connect to Server Cannot connect to MSSQLSERVER. ADDITIONAL INFORMATION: A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server) (Microsoft SQL Server, Error: 67) For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&EvtSrc=MSSQLServer&EvtID=67&LinkId=20476 BUTTONS: OK I went into the Configuration Manager and enabled named pipes and restarted the service (this is something I have done before as this message is common and not serious). I have disabled Windows Firewall temporarily. I have checked the instance name against the error logs. Please advise on both of these errors. I think these two errors are related. Thanks

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• Embedded Spotlight does not function in Outlook 2011

  - by syntaxcollector

  I have a rather strange problem. I manage a network of about 35 Mac, and we all recently switched from Mail.app to Outlook 2011 (Please don't debate this, I've already had this conversation ad nauseum) We are using network home directories (NHD) server from a Windows file server over the SMB protocol. The problem I'm having is Spotlight does not function inside of Outlook. But ONLY inside of Outlook. The global Spotlight can find all email and contacts with Outlook, but the embedded Spotlight cannot. As a test, I took one of my users and switched them from a network home directory to a portable home directory (PHD) (this means the home folder was copied to the local hard drive). This resulted in a working Spotlight within Outlook, as soon as I switched the user back to an NHD, however, it stopped working. I have already tried erasing the Spotlight index and killing the process to force re-indexing. I have exhausted all Spotlight troubleshooting, and since the global is working that is obviously not the issue. I believe it has something to do with the Spotlight plugin Microsoft wrote that is located in /Library/Spotlight. Any ideas?

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• Strange performance issue with Dell R7610 and LSI 2208 RAID controller

  - by GregC

  Connecting controller to any of the three PCIe x16 slots yield choppy read performance around 750 MB/sec Lowly PCIe x4 slot yields steady 1.2 GB/sec read Given same files, same Windows Server 2008 R2 OS, same RAID6 24-disk Seagate ES.2 3TB array on LSI 9286-8e, same Dell R7610 Precision Workstation with A03 BIOS, same W5000 graphics card (no other cards), same settings etc. I see super-low CPU utilization in both cases. SiSoft Sandra reports x8 at 5GT/sec in x16 slot, and x4 at 5GT/sec in x4 slot, as expected. I'd like to be able to rely on the sheer speed of x16 slots. What gives? What can I try? Any ideas? Please assist Cross-posted from http://en.community.dell.com/support-forums/desktop/f/3514/t/19526990.aspx Follow-up information We did some more performance testing with reading from 8 SSDs, connected directly (without an expander chip). This means that both SAS cables were utilized. We saw nearly double performance, but it varied from run to run: {2.0, 1.8, 1.6, and 1.4 GB/sec were observed, then performance jumped back up to 2.0}. The SSD RAID0 tests were conducted in a x16 PCIe slot, all other variables kept the same. It seems to me that we were getting double the performance of HDD-based RAID6 array. Just for reference: maximum possible read burst speed over single channel of SAS 6Gb/sec is 570 MB/sec due to 8b/10b encoding and protocol limitations (SAS cable provides four such channels).

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• Solaris 10 invalid ARP requests from 0.0.0.0?

  - by JWD

  The guys at the data center where I'm hosting a server running Solaris 10 are telling me that my server is making a lot of invalid arp requests. This is an example of a portion of what was sent to me from the logs (with Mac addresses and IP addresses changed). xxxx:xxxx:xxxx/0.0.0.0/0000.0000.0000/[myipaddress]/[Datestamp]) I don't see anything in the arp tables (arp -a) or routing tables (netstat -r) and I don't see anything relating to 0.0.0.0 when snoping the arp requests. The only place I see any reference to 0.0.0.0 is if I do netstat -a for the SCTP SCTP: Local Address Remote Address Swind Send-Q Rwind Recv-Q StrsI/O State ------------------------------- ------------------------------- ------ ------ ------ ------ ------- ----------- 0.0.0.0 0.0.0.0 0 0 102400 0 32/32 CLOSED But not really sure what that means. Doesn't seem like I can disable SCTP. Does anyone have any idea what might be causing this and how to stop it? I think the switch I'm connected to doesn't like it and momentarily drops the connection. Is there anyway to at least block those requests using ipfilter or something else?

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• Asterisk/FreePBX: Allow other Google Talk clients to ring when using motif module

  - by larsks

  I've recently installed FreePBX to act as a link between a SIP soft phone and my Google Talk account. It was easy to set up and outbound calls work just fine, but I've run into two problems with inbound calls that I'm not sure how to resolve. I'm using an inbound route to forward all calls from Google to my soft phone. If the soft phone is not currently registered, Asterisk answers and immediately generates a fast-busy signal (reporting CHANUNAVAIL in the logs), and the call is lost. If the soft phone is registered, Asterisk "answers" the call before rining the soft phone, which means that other Google Talk clients never ring (since from their perspective someone has answered the call). For solving (1) seems like I could use the ChanIsAvail() function (or this answer) to prevent Asterisk from answering in the event that the phone isn't registered. However, I'm not sure what to do about (2), because the behavior I want is for Asterisk to not "answer" the call until I answer the call on the soft phone. How do I configure Asterisk (ideally within the FreePBX framework) such that I can continue to receive calls at other Google Talk clients in addition to forwarding them to a SIP phone?

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• HTTP Error 503. The service is unavailable

  - by user1671639

  I'm struggling to setup the environment in IIS8, I searched a lot but couldn't find a right solution. I checked the error logs, but no idea. C:\Windows\System32\LogFiles\HTTPERR 2013-10-09 09:28:39 192.168.43.205 60172 192.168.43.205 80 HTTP/1.1 GET / 503 2 AppOffline qa.hti.local 2013-10-09 09:28:39 192.168.43.205 60192 192.168.43.205 80 HTTP/1.1 GET /favicon.ico 503 2 AppOffline qa.hti.local Then in Event Viewer: WARNINGS: A listener channel for protocol 'http' in worker process '11188' serving application pool 'qa.hti.local' reported a listener channel failure. The data field contains the error number. A listener channel for protocol 'http' in worker process '7492' serving application pool 'qa.hti.local' reported a listener channel failure. The data field contains the error number. A listener channel for protocol 'http' in worker process '9088' serving application pool 'qa.hti.local' reported a listener channel failure. The data field contains the error number. A listener channel for protocol 'http' in worker process '9964' serving application pool 'qa.hti.local' reported a listener channel failure. The data field contains the error number. A listener channel for protocol 'http' in worker process '7716' serving application pool 'qa.hti.local' reported a listener channel failure. The data field contains the error number. I don't understand what the warning means. ERROR: Application pool 'qa.hti.local' is being automatically disabled due to a series of failures in the process(es) serving that application pool. Note: I learned that consecutive 5 failures leads to APP Pool crash, and this can increased. I also tried increasing this but no success. OS: Windows server 2012 IIS Version: 8 Please share your thoughts.

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• Internet Explorer / Windows 7 does not want to show HTML file from local network drive

  - by Jaanus

  Setup: I have Windows 7 running inside VirtualBox on Mac OS X host. I have a shared drive with some HTML files, that I am mounting as a local drive W: in Windows, from the VirtualBox server \VBOXSVR. I want to look at them with a browser in Windows. Chrome in Windows 7 opens and shows those HTML files just fine (file:///W:/welcome.html). But Internet Explorer does not, and shows this error instead of the files: Internet Explorer cannot display the web page What you can try: [button Diagnose Connection Problems] More information This problem can be caused by a variety of issues, including: Internet connectivity has been lost. The website is temporarily unavailable. The Domain Name Server (DNS) is not reachable. The Domain Name Server (DNS) does not have a listing for the website's domain. If this is an HTTPS (secure) address, click Tools, click Internet Options, click Advanced, and check to be sure the SSL and TLS protocols are enabled under the security section. For the internet zone in the status bar, it shows: Internet | Protected Mode: On IE settings are a mystery to me, and I could possibly get it to work by tweaking IE settings, but I don't know which ones. How do I make IE show the same files that Chrome is happy to show? (Chrome showing them means that the files themselves are fine, there is something about the setup that just makes IE be a diva.)

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• How to use most of memory available on MySQL

  - by Zilvinas

  I've got a MySQL server which has both InnoDB and MyISAM tables. InnoDB tablespace is quite small under 4 GB. MyISAM is big ~250 GB in total of which 50 GB is for indexes. Our server has 32 GB of RAM but it usually uses only ~8GB. Our key_buffer_size is only 2GB. But our key cache hit ratio is ~95%. I find it hard to believe.. Here's our key statistics: | Key_blocks_not_flushed | 1868 | | Key_blocks_unused | 109806 | | Key_blocks_used | 1714736 | | Key_read_requests | 19224818713 | | Key_reads | 60742294 | | Key_write_requests | 1607946768 | | Key_writes | 64788819 | key_cache_block_size is default at 1024. We have 52 GB's of index data and 2GB key cache is enough to get a 95% hit ratio. Is that possible? On the other side data set is 200GB and since MyISAM uses OS (Centos) caching I would expect it to use a lot more memory to cache accessed myisam data. But at this stage I see that key_buffer is completely used, our buffer pool size for innodb is 4gb and is also completely used that adds up to 6GB. Which means data is cached using just 1 GB? My question is how could I check where all the free memory could be used? How could I check if MyISAM hits OS cache for data reads instead of disk?

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• Vista ICS issue

  - by Bill Grey

  I have a strange problem with Internet Connection Sharing on a laptop running Vista Business. This laptop is connected to the internet via the ethernet port, which goes to an ADSL modem. it is automatically assigned the IP address 192.168.1.50, and the modem/gateway is 192.168.1.1 My friends laptop is running Vista Home. Previously, I would create an ad hoc wireless network, enable ICS, and everything would be perfect. My friend would have internet access via this. However, something has now mysteriously broken. If I enable ICS on the wireless connection, it resets my Local Area Connection, assigning it the manual IP address of 192.168.0.1, which means my connection to the internet is destroyed. Both wireless adapters on each network are assigned auto configuration addresses, in the 168. range. They can see each other fine, but my friends laptop cannot access the internet via mine, even after I have restored the Local Area Connection settings. I understand the computer with ICS enabled must have the IP of 192.168.0.1, but previously, before whatever went wrong, my wireless adapter would be 192.168.0.1 and my friends computer would get an IP via DHCP. I have also tried setting static IP address and making a bridge, none of which works. How can I fix this problem, and prevent enabling ICS from touching my Local Area Connection? Both machines have no firewall, have appropriate settings etc...

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• Sql Server Management Studio: Change Prefix or Suffix characters

  - by PhantomDrummer

  I have an instance of SSMS 2008, for which the option to edit data in a table doesn't work. If I right-click on any table in the Object Explorer and select 'Edit top 200 rows' I get an error dialog 'Invalid prefix or suffix characters. (MS Visual Database Tools)'. The error seems to be associated specifically with SSMS, not with SQL Server (because this SSMS instance gives the same error no matter what database I connect to, but I've verified I can connect to some of the same databases using SSMS on other machines without the error). (However, our firewall prevents me using SSMS on other machines for some crucial tasks, so I do need to fix the problem). Googling for the error suggests that I should change the prefix, suffix or escape character, but without any indication of how you can make that change in SSMS. I'd also note that I'm not aware of having done any customization on SSMS since installing it, so would be surprised at having to make such a change now. Does anyone have any idea what the error message means or what I can do about it? Or how I can change the prefix/suffix/escape characters if that is really the problem.

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