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• Does multi-platter hard-drive use all of their heads to read simultaneously?

  - by WiSaGaN

  Suppose we have a harddisk with 2 platters with characteristics below: Rotational rate: 10, 000 RPM Avg sectors/track: 1000 Surfaces: 4 Sector size: 512 bytes I was reading "Computer Systems: A Programmer's Perspective 2ed" when I found that it calculates transfer time as if it only uses ONE head to read a sector. If that's the case, why not use 4 heads to write(read) on 4 surfaces? So when I write a 2K bytes file, each head should only need to wait for the platters to rotate just one sector length instead of 4, thus reducing the transfer time by a factor of 4. Or even redesign sector to make each sector on one cylinder but on 4 tracks residing same position respectively on 4 surfaces. Each one of (512/4) bytes. So when the hd needs to read a sector of 512 bytes, we only need the disk to rotate roughly 1/4 compare to original time. The idea looks like RAID 0.

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• How to move a Windows instance to a different EC2 data centre?

  - by Darren Cook

  I've a Windows EC2 instance running in one region and need to move it to another region (Tokyo and Singapore in this case). Is that even possible? What potential problems do I need to watch out for? (I found http://stackoverflow.com/questions/2181849/ec2-instance-cloning which is describing how to do it, but appears to assume Linux instances, and to assume the same data centre. Is it possible to move my keys across to another region?) I tried something similar with a Windows instance a few months ago, just trying to clone it in the same data centre, but I couldn't get it working quickly, so I had to give up and just create a fresh instance at that time. This time I've got a bit of breathing space, and want to research how to do it properly! Root Device Type: ebs Block Devices: sda1 xvdf (both are ebs, "attached", and have Delete on termination set to "no"; sda1 is the root device) The AMI is described as "Unavailable" (then an ami number).

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• How can I redirect HTTPS(S) traffic to anothr gateway?

  - by PsyStyle

  I have a network like 192.168.0.0/15 with the default gateway set to 192.168.0.1. Al the workstations of the network use this gateway for all kind of accesses to the Internet. Now I am testing a new Internet connection with another provider and for this I am using a second gateway on the same subnet with 192.168.0.2 as IP address. I want to redirect only HTTP and HTTPS traffic to this second gateway without touching the address of the default gateway set inside every workstation. How can I accomplish this task? What I have to change inside the first's gateway firewall configuration or routes? I tried with a dnat like DNAT loc:192.168.0.1 loc:192.168.0.2 tcp 80 but nothing worked. I use Shorewall for simplicity in configuration but I can understand even theorical answers which I will try to adapt to my case

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• Why is it possible to change the password of an admin user on linux?

  - by enum

  A few days ago, a friend of mine, wanted to show me that he can use my linux even if I don't tell him my password. He entered in GRUB, selected the recovery mode option. My first problem is that he already had access to my files (read only). He tried to do passwd but failed. Then he did some kind of remount (I guess that gave him write rights) and after that he was able to change my password. Why is this possible? I personally see it a security issue. Where I work there are several people that use linux and neither of them have a BIOS password set or some other kind of security wall.

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• Should I bother upgrading my Opteron 270 Server?

  - by MousePad

  I have an Opteron Server machine (in a large workstation class case) running on the Tyan 2895 motherboard. It's a dual CPU socket board, but I only have one 270 in there. I have 4GB of RAM, but less than 3GB is addressable, even in 64bit mode, due to the way the board is designed. Is it worth spending a few hundred on an additional CPU and maybe some more RAM? The other problem is that one of the two SATA ports on the board had its wire socket break off. So only one drive can be run as of now. I could have it repaired, but at what cost? Add in the fact that the power supply is gunked up with dust and it's a bit of a nightmare. I actually work about it getting too hot. Seems that for the money I could buy a new server rack from Dell, but it also seems a shame to waste an otherwise working, and for my needs still very fast machine.

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• Need hosting (e-mail, http) for external domains

  - by disappointed

  This may not be the right place, but since it is a more technical aspect of the hosting world, I am taking the liberty to ask: I'm currently running a virtual server with nginx and postfix for web and e-mail, but I can't handle the administration and, due to frequent problems with e-mail services, I need to resolve this with a almost-standard hosting package (anything should work, even 5 MB static files would be OK). The exception being that I would like to use several domains, hosted with different registrars, for web and e-mail. Currently, this is a very simple configuration in my setup. All hosters I have looked at seem to think this a costly business (more than domain registration costs), but of course the recommend to transfer domains to them (they want the $$). Does anyone know of a hosting company that allows its customers to freely manage domains registered somewhere else?

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• Windows Virtual Machine ping reply fails the first few times

  - by user28471

  I am running a windows Web Server 2008 virtual machine. When I try to ping it from another windows machine the ping reply comes straight back with 100% success. But when I try to ping it from one of the Linux boxes, the ping reply fails with partial or 100% loss the first couple of time and succeeds the third time onwards. I know it is quite strange but can any one think anything that could be causing it. Could anything in the Windows Domain Security or Firewall be "taking time" to allow responding to the ping request? In fact even the firewall is turned off on the virtual machine.

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• Installing packetfence

  - by BrNathan

  I asked in the Ubuntu area, but thought I would get a better answer here. Was anyone able to install packetfence on Ubuntu 10? I tried a tutorial, but didn't have any luck. Some of the services installed and are working apache with php, snort, pfdetect, and pfdhcplistener. I can even get info with pfcmd node view all, but for the life of me I can't get it to work with apache2. When I run pfcmd service pf start I also get an error uninitialized value $_[7] in join at /usr/local/pf/lib/pf/class.pm line 170

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• How to achieve in-folder discussions with IMAP (skip SMTP send, Thunderbird)?

  - by lkraav

  Does anyone know a good way to achieve replying to a message into the same IMAP folder without sending another duplicate copy over SMTP? This is to be achieved with a conventional GUI mail client, especially Thunderbird. Goal is to have an in-folder conversation. This is possible with shared IMAP folders, with per-user Seen indices, where subscribed recipients are guaranteed to see the new messages without them arriving from internet. Thunderbird is capable of storing a copy of a reply in the same folder as original message (Account Options), which is half way there. Just pressing Save sends the message into Drafts and that is probably an even bigger patch to try to put a "draft message" into the same folder as original. All options, client, server or logic-wise are an acceptable answer, including programming i.e. patching/creating add-on for Thunderbird.

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• WSS 3.0 fails to hide quick launch items for which the current user does not have access

  - by Nils

  Hello, I'm running a Small Business Server 2008 with Windows Sharepoint Services 3.0 (WSS 3.0). I thought WSS was supposed to hide menu items for which the current logged in user don't have access? Apparently, all users can see all links, regardless of whether they have access. This applies to both links to newly created sub-sites as well as document libraries/lists. Is this expected behaviour, or is there a misconfiguration somewhere that causes the links to stay visible even for users without access? Thanks!

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• Can't connect to ssh after nfs problem

  - by MihaiM

  Hello, I had a problem yesterday with a server that lost connection (S1). From that server, there was a dir shared with NFS to another one (S2), no homedir and not in $PATH, but a dir to store old files for archiving. S1 was back online after a few hours, but now I cannot access S2 because of this (and I'm sure it's because of that because all other services are running without any problem). The ssh connection hangs here: debug1: Entering interactive session. I know a reboot will do the job, but considering this is the NAS of a big app, my bosses will kill me if I do it. Is there any other way to get over this? I tried with different users, but all of them hang in the same place. I connected with HP iLO and not even there I cannot use my username. Thanks in advance.

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• Is there a "pattern" or a group that defines *rcs files in *nix environments?

  - by Somebody still uses you MS-DOS

  I'm starting to use command line a little more, and I see there are a lot of ways to configure some config files in my $HOME. This is good, since you can customize it the way you really like. Unfortunately, for begginners, having too many options is a little confusing. For example, I created .bash_alias for some alias I'm using. I didn't even know this option existed, I'm used to simply edit .bashrc. Do exist a pattern, a "good practice", envisioning flexibility and modularity in terms of rc files structure? Do exist a standardization group for this, or every body just creates it's own configuration setup?

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• When I remove the SSL port 443 from IIS my website stops loading, how can I have it just work with only port 80 and no SSL?

  - by shogun

  I am trying to disable SSL, I delete the 443 port so there is only an entry for port 80 and now the site won't load at all. If I re-add the 443 configuration it loads fine. What is causing it to require that? Why can't I set it up to run without SSL? Instead of just failing it should just load the page without HTTPS. If I disable port 443 and then I browse via HTTP, it STILL fails even though I am not trying to use HTTPS. What gives? When/where/how does it decide to use SSL?

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• How to run Medisoft Patient Accounting Demo on Windows 7?

  - by John

  I installed Medisoft Patient Accounting Demo but every time I try to run it, I get this error: tblExclusiveNew: One of the Database property or the AdsConnection property must have a value. I click OK and then get this error: Exception AdsConnectionError in module MW.EXE at 001FA701. Must specify connection string before getting a server connection. The program then immediately exits. Then a get this error: Ar3import -An error has occurred dmIPCCommunication: No core product found I click close and then: Ar3import-An error has occurred An unspecified error has occurred, please call tech support Googling was no help. Even the Medisoft tech on the Medisoft forum thread I found was unable to fix it. Is this fixable?

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• How to get a windows domain server to recognize a linux machine by its name?

  - by CaCl

  In my company I ran into an issue where we have a linux machine that serves up a Subversion repository. Its hooked up via LDAP to the Active Directory. We got an account setup for an application and they set the Limited Workstations up so it didn't have full access to the network. The problem is that even though the hostname for our machine resolves correctly for me, the credentials for the application account seem to come back as not being allowed based on the name (the error was related to authorized workstations). I don't have access to any of the domain servers but it might be helpful to come at the management or high-level techs with some ideas, they don't seem to have a solution besides allowing all workstations for the user. Does anyone have any idea on how to get my linux machine to properly identify itself with the Domain machine by name?

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• Is it possible to allow saved passwords for remote desktop in a domain environment?

  - by user2813274

  I have checked the "remember password" and every single time, even if it connects correctly after I type a password and check the box, it does not allow subsequent logins using the stored password, saying that it is invalid - is it being saved improperly somehow? is it being disabled by some obscure setting somewhere? (which would be very counter-intuitive, seeing as how the check box is available). I have tried both with domain and non-domain (local) admin accounts, and am using the FQDN for the server. edit: as a troubleshooting step, where would one go to find the (hopefully hashed) password?

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• Does "I securely erased my drive" really work with Truecrypt partitions?

  - by TheLQ

  When you look at Truecrypt's Plausible Deniability page it says that one of the reasons for partition with solely random data is that you securely erased your drive. But what about the partition table with full disk encryption? How can you explain why the partition table says there's a partition of unknown type (With my limited knowledge of partition tables I think that they store all the partition filesystem types) and with solely random data? It seems that if your going to securely erase the drive you would destroy everything, including the partition table. And even if you just wiped the partition, the partition table would still say that the partition was originally NTFS, which it isn't anymore. Does the "I securely erased my drive" excuse still work here? (Note: I know that there's hidden truecrypt volumes, but I'm avoiding them due to the high risk of data loss)

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• Redirect subdomain.example.org to somethingelse.com hidden to the user?

  - by moontear

  I'm not knowledgeable at all about C-NAMES, A-RECORDS, name servers and the like, so just bear with me on this one: I want to redirect subdomain.example.org to another domain somethingelse.com. I do own both domains and both domains run on shared hosting. When creating a subdomain, all I can do out-of-the-box is do a HTTP redirect (302, yuck!) or a frame redirect. I also can set the DNS records on one host like nameserver, CNAME - but I would have know clue what I am doing. Please explain to me how routing with nameservers works and how I should (even if not possible with my current host) redirect subdomain.example.org to somethingelse.com with the user-visible URL staying at "subdomain.example.org"

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• Why can't I change the icon being displayed for a desktop shortcut?

  - by Bill

  I wanted to change the icon showing for a shortcut on the desktop, which points to a .Net utility I created for myself. I rebuilt the exe after changing the icon used within the project. In Windows Explorer the new icon shows in all size variations for the exe. In the 'Change Icon' dialog from the Properties option, the correct icon is showing as present, yet when I Apply it remains with the old icon??? Even when I delete the shortcut and create a new one pointing to the newly built exe the old icon somehow is assigned???

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• Move already (i.e. not new) completed files in rtorrent

  - by Skippy le Grand Gourou

  I've been using rtorrent for a while with a single directory. Now I figured out it was possible to use different directories and even to move completed downloads elsewhere, so according to the rtorrent wiki I edited my .rtorrent.rc as follow : # Download directory directory = /Medias/torrents/ # Watching directories schedule = watch_directory_1,5,60,"load_start=/path/to/dl/dir1/*.torrent,d.set_custom1=/path/to/done/dir1" schedule = watch_directory_2,5,60,"load_start=/path/to/dl/dir2/*.torrent,d.set_custom1=/path/to/done/dir2" # On completion, move the torrent to the directory from custom1. system.method.set_key = event.download.finished,move_complete,"d.set_directory=$d.get_custom1= ;execute=mv,-u,$d.get_base_path=,$d.get_custom1=" It seems to work for new torrents. However I have a bunch of completed files I have already downloaded before to split directories, and for them it does not work : if I delete their file in the session directory, rtorrent will check the hash but won't move them, and if I move them by myself rtorrent won't see them and will try to redownload them. So how can I tell rtorrent either to move them or that they are in another directory ? Thanks.

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• Word 2010 doc skips pages

  - by Sarah

  A Word document with 9 pages, 3 section brakes next page (no odd and even breaks used) and inserted page numbers shows the correct sequence of pages when moving thru the document. When I change the page numbers in section 2 to start from 1 (Section 1 is only one page numbered with a roman numeral.) Then two strange things happen: The sequence in the status bar goes from 1 to 3. Page 2 disappeared (no text is missing) and my total number of pages reads 10 when i actually only have 9. The first page has a table of contents. Page 2 is listed, but when I press ctrl + click the shortcut it goes to page 4?

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• Apache not responding in amazon ec2

  - by Viren

  Well this might sound awkward but I facing terrible issue with my Amazon EC2 instance one of the finding I see is that apache is not responding on port 80 which is weird because I can't even find the incoming packet to port 80 in tcpdump output As per the security rules all security rules are in place correctly at least in amazon console I restarted the apache to listen to port 8080 and added port 8080 and add 8080 to security rule and everything work but I cant just able to understand as to why the port 80 not responding Needless to say since port 8080 is responding all my CNAME and A-record is working too UPDATE No firewall issue either I just cross check the iptables and list is empty Can some share a light on this

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• Using Dropbox API instead of a FTP server for backing up DB/Source in your application.

  - by Somebody still uses you MS-DOS

  This is a small aplication scenario. Usually, when you have to do some backups of source code/database on your server, you use a second ftp server, a cronjob to tar.gz your db dumps and source files, and send this file to your ftp server from your application server. Dropbox created an API to use it's infrastrucutre. Since they provide 2gb for free accounts, I thought about being able to upload to it instead of a ftp server. So, if you do some freelance work, you can create a free account for each client and use this approach, maybe encrypting the files you send. You even gain a revision for each sent file, like a revison control system, for free, from the last 30 days. What do you think of this approach? Is it possible? And, more importantly: what are the security risks involved? (That's why I'm asking this on serverfault, since this POV from sysadmins will be more accurate). Thanks!

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• Tar an gzip together, but the other way round?

  - by Boldewyn

  Gzipping a tar file as whole is drop dead easy and even implemented as option inside tar. So far, so good. However, from an archiver's point of view, it would be better to tar the gzipped single files. (The rationale behind it is, that data loss is minified, if there is a single corrupt gzipped file, than if your whole tarball is corrupted due to gzip or copy errors.) Has anyone experience with this? Are there drawbacks? Are there more solid/tested solutions for this than find folder -exec gzip '{}' \; tar cf folder.tar folder

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• Why can't I change the icon being displayed for a desktop shortcut?

  - by Bill

  I wanted to change the icon showing for a shortcut on the desktop, which points to a .Net utility I created for myself. I rebuilt the exe after changing the icon used within the project. In Windows Explorer the new icon shows in all size variations for the exe. In the 'Change Icon' dialog from the Properties option, the correct icon is showing as present, yet when I Apply it remains with the old icon? Even when I delete the shortcut and create a new one pointing to the newly built exe the old icon somehow is assigned?

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