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• Giving the root user priority to maintain Debian (while server collapsing under heavy load)

  - by Saix

  Is there any way to setup Debian to prioritize any or specific root's activity before every other? For instance, several times per year something gets wrong (usually man's fault by overstressing apache/mysql) and system gets unresponsive under heavy load like 200 (8-core cpu). I know there are limits for php scripts to run then kill, but that's not the way because this limit has to be at least 45 minutes long. The problem is, until I'm able to login via SSH and let apache/mysql restart under this server stress, it nearly hits these 45 minutes anyway. Also hardware restart causing usually to run fsck at boot time on all harddrives since it's usually pretty long the box haven't been restarted. I was told it's really not good idea disabling fsck but then again, it takes more then hour to complete. What is the fastest way to restart apache/mysql? Is there any way to give ssh users or root user higher priority so the logging in and completing these restarts (rather stops though) commands wouldn't take so long? One comes to my mind.. use NICE for apache/mysql but no way. I can't risk limiting those two vital apps 24/7 or could I? I'm a little bit scared if any other system process wouldn't slow the pages down too much. Any backup process, swap (if any) etc. There is pretty heavy PHP framework with 20k visits a day, so it needs every hw/sw resource available. I can't throttle it the whole time, just in certain points when system gets unresponsive, so I could maintain it.

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• cPanel FTP account access to sym links from parent directory

  - by totbar

  I would like to give a potential developer temporary access to some of my projects. I have almost everything in its own subdomain, and each directory is a sibling to my public_html directory. It looks something like: ("developer" is the cPanel account name.) developer/ *This is the top level directory for the cPanel account. "/home/developer" site1/ *site1.mysite.com site2/ *site2.mysite.com site3/ *site3.mysite.com public_html/ *www.mysite.com ... etc I created a directory inside public_html called tempdev and I added symbolic links to each of the sibling directories listed above. My understanding of cPanel is that I can only assign one user with "Special FTP Access" per domain. I really dont want to give a complete stranger my login creds, (its just a development environment but still). So I used the cPanel FTP account creator UI. It will not allow me to assign the user access to the directories outside of public_html. I cant even give access to public_html either. So I made the tempdev directory in www and created the symlinks. Using the new account, I can see the symlinks, but I can go into them. Is there a better way to accomplish what I am attempting?

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• How can I document and automate a system's configuration?

  - by Diomidis Spinellis

  Having a system's configuration represented by its current state is risky, inefficient, and opaque. At some point you may be left with an unsupported system and no upgrade path. Then configuring a new system compatible with the old is a process or trial and error. Furthermore, if at some point the system is damaged the only option is to go back to the most recent full backup, and try to remember what changes followed from that point. Also, the only way to create a system compatible with the original is through a complete dump/restore. Finally, in such a setup there's no way to know how you solved a particular problem; the only thing you can do is to look at the corresponding configuration files and try to guess what you changed to achieve the desired effect. Currently for each system I maintain, I keep a log file where I record all system administration activity, starting from the installation: installation options, added packages, changes in configuration files, updates, problem fixes etc. In theory this allows me to (manually) replay all changes to arrive at the current state, or to unroll an erroneous change by executing the reverse commands. However, this process is also inefficient, error-prone, and relies on human judgment. Another thing I've tried is to put /etc configuration files under version control with git. This helps me document the changes automatically and also apply them on a clean setup. But it's not without problems: git has to run under sudo, passwords and private keys may be stored in the repository, installed packages can't be meaningfully tracked, and git will have a fit if I try to extend this approach to all the system's directories. I've also thought about performing all changes through shell scripts or makefiles, but I think this process will require a lot of effort and will be fragile. Are there some better methods or tools that I'm missing?

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• VPN with VLANs? [closed]

  - by Craig

  As usual, I'm sure I'm in way over my head on this one. My networking skills are limited; so, bear with me if you will. What I have are a few testing servers at my house as well as at a friends house that I want to link together so they can see each other (VPN right? I've done those before). We want to be able to see all the servers and work with them from either location. All the servers also need to be able to see each other. But, we don't want to see each others PCs, printers, PS3s etc. How do we pull that trick off? Multiple VLAN?... subnets?... what? If hardware matters, I have an old PC I was planning on loading pfSense onto because my current el-cheapo router doesn't support VPN. The VPN linking the houses is about the only thing I'm sure on. Beyond that, I'm lost. I'm not a complete noob; but, like I said, I'm not so sharp with the more complex networking. I do however read well... So use lots of descriptive words and feel free to link away to long dry articles if necessary. :-)

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• Windows 7, Black screen with cursor, impossible to logon

  - by PJC

  First - I have gone through as many possible solutions I've found here and elsewhere. [Edit - to describe the issue in more detail, the PC appears to boot correctly, but instead of the logon screen, I have been getting a black screen WITH the pointer cursor, and it responds correctly to the mouse. Pressing CTL-ALT-DEL brings up the logon screen's background, but with no logon area nor any other content. This screen was at the full resolution before I uninstalled the graphics driver in safe-mode.] I also just ran a full up-to-date AVG scan from boot media. [Edit - the AVG scan, which was updated to today's virus signatures, found no issues at all.] So - steps I've tried: Safe Boot, Restore from before the issue - done, no help. Uninstall the graphics driver - done, now i have a 1024x768 fallback screen, still no way in. sfc /scannow - only doable from Safe boot obviously, but no change. [Edit - booting from restore media, performing a startup repair and...]Restore further back - restored to 2 days ago, and I'd had many reboots since then with no problem. Enable autologin to try to get beyond the login screen - done, doesn't work. It seems the best advice is complete reinstall, but I really don't want to do that because it'll take 3-4 days to add all the apps I use. Some key points to note - in both states - before and after removing the video driver, I always had a mouse cursor on the screen. CTL-ALT-DEL flashes up the login background, but no login info. I can (and often do) reinstall from scratch, but was at a fairly stable state before this, and would prefer not to. -Paul

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• Diff bios - corrupt video driver

  - by sfonck

  Hi, I'm using an Dell M90 Precision Laptop which has a NVidia Quadro FX 2500M graphics card and is running Windows XP. Laptop has been running fine - but a few weeks ago screen went 'white' - restarted computer- bios and startup screens show weird green dots and stripes, normal startup only shows a black screen... only VGA mode works to display something. I've been trying to remove and reinstall the correct drivers downloaded from Dell's website - no solution. I gave up and reinstalled XP - everything was working perfect again. 2 weeks later - again the white screen - tried everything again (flashin new bios also - nothing works) Reinstalled XP - everyhting was working again, so I made a DriveSnapShot of the partition. Today - again the 'white screen'. Ok, no problem ...I was thinking all I needed to do was to restore the DriveSnapShot backup... Few minutes later the backup is restored ... but guess what: video driver does not work correctly... As the DriveSnapShot restored the complete partition, as it was at the time everything was working perfectly, this would mean my driver problems are due to 'settings' in the bios or on the graphics-card itself + these 'settings' can get overridden by doing a new XP-install.... I'm out of options, can somebody help me to find a solution for this problem: Is there some way to backup and restore a bios after seeing some problems? Is there some way to know what is causing this problem like a bios diff utility? Thanks!

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• Mysql: create index on 1.4 billion records

  - by SiLent SoNG

  I have a table with 1.4 billion records. The table structure is as follows: CREATE TABLE text_page ( text VARCHAR(255), page_id INT UNSIGNED ) ENGINE=MYISAM DEFAULT CHARSET=ascii The requirement is to create an index over the column text. The table size is about 34G. I have tried to create the index by the following statement: ALTER TABLE text_page ADD KEY ix_text (text) After 10 hours' waiting I finally give up this approach. Is there any workable solution on this problem? UPDATE: the table is unlikely to be updated or inserted or deleted. The reason why to create index on the column text is because this kind of sql query would be frequently executed: SELECT page_id FROM text_page WHERE text = ? UPDATE: I have solved the problem by partitioning the table. The table is partitioned into 40 pieces on column text. Then creating index on the table takes about 1 hours to complete. It seems that MySQL index creation becomes very slow when the table size becomes very big. And partitioning reduces the table into smaller trunks.

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• How best to handle end user notification in the event of system failure incl. email?

  - by BrianLy

  I've been asked to research ways of handling end user notifications when systems such as email are experiencing problems. Perhaps an example will make this a little clearer. We have a number of sites in different countries. Recently email was impacted at one of the sites, but it could have been a complete network outage. Information was provided by phone to local IT managers at the site but onward communication was slower than some would have liked. It seems like almost everyone at the site has a personal mobile phone which could receive text messages, and perhaps access a remote website with postings on the situation. However managing and supporting a system to text people on these relatively infrequent occasions would be very costly to do internally. What are other people doing to handle situations like this? Some things I've thought of include: Database of phone numbers to text. Seems costly and not very easy to maintain for an already stretched IT group. Is there an external service that would let you do this policies? Send voicemail message to all phones on site. Maintain an external website. This would not work in all situations (network failure), and there is a limit on the amount of info that can be posted externally. A site outage could be sensitive information in some situations. How could the site be password protected? Maybe OpenId/Facebook connect would work. Use a site like Yammer.com which is publicly accessible but only by people with a company email address. Anyone using this for IT outage notifications? To me it looks like there is no clear answer, and that there are solutions for some subsets of users. To be comprehensive a number of solutions would need to be combined. Any additional thoughts or recommendations? What worked or didn't work for your organization?

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• Backing up 80G hard drive 1G per day

  - by barrycarter

  I want to securely backup my 80G HD, but doing a complete backup takes forever and slows down my machine, so I want to backup just 1G per day. Details: % First hurdle: on the first day, I want to backup the "first" 1G of the hard drive. Of course, there really is no "first" 1G on a hard drive. % After 80 days, I'll have my whole HD backed up... assuming none of my files ever change, which of course they do. So the backup plan/program must also catch file creation/changes as they come along. % The backups must be consistent, in that I can restore my system by restoring the backups sequentially. In other words, "dd if=/harddrive" probably won't work. % The backups should encrypt file contents AND names, but I don't see this as a major hurdle. % Once the backup has backed up everything (even changed files), it can re-backup the first 1G on my hard drive. Even though this backup is redundant, that's OK, because I always want to be backing up something (eg, if I'm backing up to optical media, the older media might start going corrupt). Is there a magic backup plan/program that does this? In reality, I want to do this for multiple machines with multiple drives each, but think that solving the above will solve the general case.

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• cause for mysql crash

  - by user1322092

  A cron job automatically restarted my mysql database. What's the cause for the crash, or can you suggest how to resolve or monitor. I would REALLY appreciate your input. 120715 14:38:58 mysqld started 120715 14:38:58 InnoDB: Started; log sequence number 0 411137570 120715 14:38:58 [Note] /usr/libexec/mysqld: ready for connections. Version: '5.0.95' socket: '/var/lib/mysql/mysql.sock' port: 3306 Source distribution 120715 15:14:21 [Note] /usr/libexec/mysqld: Normal shutdown 120715 15:14:23 InnoDB: Starting shutdown... 120715 15:14:25 InnoDB: Shutdown completed; log sequence number 0 411166467 120715 15:14:25 [Note] /usr/libexec/mysqld: Shutdown complete 120715 08:14:25 mysqld ended 120715 08:14:26 mysqld started 120715 8:14:26 InnoDB: Started; log sequence number 0 411166467 120715 8:14:26 [Note] /usr/libexec/mysqld: ready for connections. Version: '5.0.95' socket: '/var/lib/mysql/mysql.sock' port: 3306 Source distribution 121212 09:15:32 mysqld started InnoDB: The log sequence number in ibdata files does not match InnoDB: the log sequence number in the ib_logfiles! 121212 9:15:58 InnoDB: Database was not shut down normally! InnoDB: Starting crash recovery. InnoDB: Reading tablespace information from the .ibd files... InnoDB: Restoring possible half-written data pages from the doublewrite InnoDB: buffer... 121212 9:17:28 InnoDB: Started; log sequence number 0 554145193 121212 9:17:57 [Note] /usr/libexec/mysqld: ready for connections. Version: '5.0.95' socket: '/var/lib/mysql/mysql.sock' port: 3306 Source distribution

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• Laptop freezing every few seconds, including screen + sound

  - by zenstealth

  Just a few days ago, my Windows 7 HP dv4170us (1.76Ghz CPU, 1GB Ram) laptop started to freeze every other second where everything on screen and and sound (such as a song playing in iTunes) would just freeze until I bash it violently (without actually breaking the laptop) or wait for a couple of more seconds. I think it started one night when I noticed that a USB mouse of mine stopped working, and it displayed random "Device was not recognized" errors. I just unplugged the mouse and ignored it. Skip forward to the next day, is started freezing, and as of today I can't get my computer to not keep freezing. I tried to backup my files onto an external hdd, but it almost corrupted the drive. I ran 4 complete virus scans using MSSE and MalwareBytes (both quick and full scans), and they all came up clean. In the Task manager, the CPU usage is on a constant max, and so is the RAM (if I have just a few apps running, I only have like 30Mb of free RAM left). Also, on the outside of my laptop, right above where the CPU is located, it's very, very hot. I suspect that something is wrong internally within inside of the computer, but I'm not sure. It also does the same thing when booted into Ubuntu.Does anyone know what could be wrong with it?

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• Linux 2.6.24-gentoo-r3-comtrance on x86_64 high Useage for unknown reasons

  - by Dorjan

  Hello everyone, I'm a complete rookie when it comes to all things Linux related so please treat me as such and assume I know nothing. That being said my Top says this: top - 12:08:03 up 11 days, 15:36, 0 users, load average: 5.47, 5.53, 5.46 Tasks: 296 total, 2 running, 294 sleeping, 0 stopped, 0 zombie Cpu(s): 6.3%us, 1.4%sy, 0.0%ni, 71.3%id, 20.6%wa, 0.0%hi, 0.3%si, 0.0%st Mem: 8176880k total, 8118236k used, 58644k free, 89312k buffers Swap: 1004052k total, 0k used, 1004052k free, 7235652k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 1229 root 15 -5 0 0 0 D 1 0.0 199:28.63 kjournald 2946 root 20 0 1716 676 552 D 1 0.0 145:02.94 syslogd 14553 root 20 0 2644 1268 876 R 1 0.0 0:00.34 top 14609 postfix 20 0 7896 1884 1460 D 1 0.0 0:00.02 bounce 14630 postfix 20 0 7896 1876 1452 R 0 0.0 0:00.00 bounce And my hard drives says: > df -k Filesystem 1K-blocks Used Available Use% Mounted on /dev/sda3 4925556 4474836 200508 96% / /dev/sda5 489992 36090 428602 8% /tmp /dev/sda6 377951852 236171160 122581816 66% /var none 4088440 0 4088440 0% /dev/shm It has been like it for a few days now... I know not what is causing the high server load (Normally around 1.3) can anyone give any tips on how to track down the culprit? Many thanks,

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• Allow connections to only a specific URL via HTTPS with iptables, -m recent (potentially) and -m string (definitely)

  - by The Consumer

  Hello, Let's say that, for example, I want to allow connections only to subdomain.mydomain.com; I have it partially working, but it sometimes gets in a freaky loop with the client key exchange once the Client Hello is allowed. Ah, to make it even more annoying, it's a self-signed certificate, and the page requires authentication, and HTTPS is listening on a non-standard port... So the TCP/SSL Handshake experience will differ greatly for many users. Is -m recent the right route? Is there a more graceful method to allow the complete TCP stream once the string is seen? Here's what I have so far: #iptables -N SSL #iptables -A INPUT -i eth0 -p tcp -j SSL #iptables -A SSL -m recent --set -p tcp --syn --dport 400 #iptables -A SSL -m recent --update -p tcp --tcp-flags PSH,SYN,ACK SYN,ACK --sport 400 #iptables -A SSL -m recent --update -p tcp --tcp-flags PSH,SYN,ACK ACK --dport 400 #iptables -A SSL -m recent --remove -p tcp --tcp-flags PSH,ACK PSH,ACK --dport 400 -m string --algo kmp --string "subdomain.mydomain.com" -j ACCEPT Yes, I have tried to get around this with nginx tweaks, but I can't get nginx to return a 444 or abrupt disconnect before the client hello, if you can think of a way to achieve this instead, I'm all ears, err, eyes. (As suggested by a user, bringing this inquiry over from http://stackoverflow.com/questions/4628157/allow-connections-to-only-a-specific-url-via-https-with-iptables-m-recent-pote)

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• Can my employer force me to backup my personal machine? [closed]

  - by Eric B

  Here's the background: Approximately 1.25 years ago, the company I work for was acquired by a larger 400 person company. Before acquisition (and today still) we are all remote employees using our own personal hardware for work-related duties (coding, email, etc). We are approximately 15 employees within the larger organization. Some time after acquisition, the now owning company was slapped with a civil lawsuit. Part of this lawsuit (discovery) is requiring them to retrieve & store from us any related information. Because we were a separate company up until acquisition, there is a high probability that our personal machines might contain information about what the lawsuit alleges (email, documents, chat logs?, etc). Obviously, this depends largely on the person's job function (engineer vs. customer support vs. CEO). All employees are being required to comply. Since acquisition (1.25 yrs), the new company has not provided us with company laptops/desktops. We continue to use personal hardware, licenses, etc for work. Email is via POP3s and not hanging around on the mail server - it's on everyone's client. Documents are spread across personal machines. So, now they want us each to backup our complete personal machines. They are allowing us to create a "personal" folder where we can place personal documents. That single folder will be excluded from backup. Of course, that means total re-arrangement of documents, etc. For most of us, 99% of the data on the machine is NOT related to work. So, what's the consensus? Should we comply? What is their recourse if we do not?

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• Jabber client for windows 7

  - by Anders

  I am looking for a jabber client with some specific functions. I have spent 1½ day looking for one and it is getting tiresome. Clients that I have been using, that have what I need, but I am not interesting for a reason in are: Pidgin, does not show complete messages in their popups. Miranda IM, I have a constant disconnect issue that does not seem to be resolved in my case. What I need are: Popups A popup that shows broadcasts to users. A popup that show when my username is typed in a conference chat. I need to be able to view the full message in the popup. No configuration of a theme to make this enabled, or if there is a working theme for it already. Preferable placement is on the top right of the screen. Able to 'popup' when running full screen applications, much like games. Conferences Easy access to bookmarked conferences. I do not want to go through submenus to rejoin a disconnected or closed conference. If I close the conference window I want to be connected to the conference until I exit the client. Tabbed interface. Configuration Sober configurations, options are great but there is a limit and the above needs to be availble in the options in a understandable manner. What I wish for: MSN Not needed! If it is avaible then it is a big plus. Facebook Not needed! If it is avaible then it is a big plus. Conferences/chats Not needed! Eyecandy is always nice.

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• amazon ec2-medium apache requests per second terrible

  - by TheDayIsDone

  EDITED -- test running from localhost now to rule out network... i have a c1.medium using EBS. when i do an apache benchmark and i'm just printing a "hello" for the test from localhost - no database hits, it's very slow. i can repeat this test many times with the same results. any thoughts? thanks in advance. ab -n 1000 -c 100 http://localhost/home/test/ Benchmarking localhost (be patient) Completed 100 requests Completed 200 requests Completed 300 requests Completed 400 requests Completed 500 requests Completed 600 requests Completed 700 requests Completed 800 requests Completed 900 requests Completed 1000 requests Finished 1000 requests Server Software: Apache/2.2.23 Server Hostname: localhost Server Port: 80 Document Path: /home/test/ Document Length: 5 bytes Concurrency Level: 100 Time taken for tests: 25.300 seconds Complete requests: 1000 Failed requests: 0 Write errors: 0 Total transferred: 816000 bytes HTML transferred: 5000 bytes Requests per second: 39.53 [#/sec] (mean) Time per request: 2530.037 [ms] (mean) Time per request: 25.300 [ms] (mean, across all concurrent requests) Transfer rate: 31.50 [Kbytes/sec] received Connection Times (ms) min mean[+/-sd] median max Connect: 0 7 21.0 0 73 Processing: 81 2489 665.7 2500 4057 Waiting: 80 2443 654.0 2445 4057 Total: 85 2496 653.5 2500 4057 Percentage of the requests served within a certain time (ms) 50% 2500 66% 2651 75% 2842 80% 2932 90% 3301 95% 3506 98% 3762 99% 3838 100% 4057 (longest request)

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• Conflicts with file from package mysql-5.0.77

  - by Whiteyq

  I'm trying to install APC (Alternative PHP Cache) on a CentOs dedicated server. I've everything done apart from configuring phpize. Running :yum -y install php-devel gives me the following error file /usr/share/mysql/charsets/Index.xml from install of mysql-libs-5.1.57-1.el5.art.x86_64 conflicts with file from package mysql-5.0.77-4.el5_5.3.i386 etc etc for other languages So, i think the mysql version i have is too old & i more than likely need to upgrade mysql to version 5.1. Im reluctant to do this as a) its a live server (although only 3/4 domains) b) ive read ill read to recompile php if i upgrade To add to this i have plesk installed for managing domains & might need reinstalling/reconfiguring also. sorry for the long intro but its my first post & best to give as much info as possible, so my question is basically Is there any way i can run :yum -y install php-devel to get phpize working to complete installation of APC for the version of mysql i currently have installed? ie 5.0.77

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• How to chain GRUB2 for Ubuntu 10.04 from Truecrypt & its bootloader (multi boot alongside Windows XP partition)?

  - by Rob

  I want Truecrypt to ask for password for Windows XP as usual but with the standard [ESC] option, on selecting that, i.e via Escape key, I want it to find the grub for the (unencrypted) Ubuntu install. I've installed Windows XP on the 120Gb hard drive of a Toshiba NB100 netbook then partitioned to make room for Ubuntu 10.04 and installed that after the Windows XP install. When I encrypt Windows XP, Truecrypt will overwrite the grub entry in the master boot record (MBR), I believe (?) and I won't be able to choose between XP and Ubuntu anymore. So I need to restore it back. I've searched fairly extensively for answers on Ubuntu forums and elsewhere but have not yet found a complete answer that covers all eventualities, scenarios and error messages, or otherwise they talk of legacy GRUB and not GRUB2. Ubuntu 10.04 uses GRUB2. My setup: Partitions: Windows XP, NTFS (to be encrypted with Truecrypt), 40Gb /boot (Ext4, 1Gb) Ubuntu swap, 4Gb Ubuntu / (root) - main filesystem (20gb) NTFS share, 55Gb I know that the Truecrypt boot loader replaces the GRUB when boot up because I've already tried it on another laptop. I want boot loader screen to look something like the usual: Truecrypt Enter password: (or [ESC] to skip) password is for WindowsXP and on pressing [ESC] for it to find the Ubuntu grub to boot from Thanks in advance for your help. The key area of the problem is how to instruct Truecrypt when escape key is pressed, and how the Grub/Ubuntu can be made visible to the truecrypt bootloader to find it, when the esc key is pressed. Also knowing as chaining.

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• rsync --remove-source-files but only those that match a pattern

  - by user28146

  Is this possible with rsync? Transfer everything from src:path/to/dir to dest:/path/to/other/dir and delete some of the source files in src:path/to/dir that match a pattern (or size limit) but keep all other files. I couldn't find a way to limit --remove-source-files with a regexp or size limit. Update1 (clarification): I'd like all files in src:path/to/dir to be copied to dest:/path/to/other/dir. Once this is done, I'd like to have some files (those that match a regexp or size limit) in src:path/to/dir deleted but don't want to have anything deleted in dest:/path/to/other/dir. Update2 (more clarification): Unfortunately, I can't simply rsync everything and then manually delete the files matching my regexp from src:. The files to be deleted are continuously created. So let's say there are N files of the type I'd like to delete after the transfer in src: when rsync starts. By the time rsync finishes there will be N+M such files there. If I now delete them manually, I'll lose the M files that were created while rsync was running. Hence I'd like to have a solution that guarantees that the only files deleted from src: are those known to be successfully copied over to dest:. I could fetch a file list from dest: after the rsync is complete, and compare that list of files with what I have in src:, and then do the removal manually. But I was wondering if rsync can do this by itself.

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• Non-volatile cache RAID controllers: what kind of protection is there against NVCACHE failure?

  - by astrostl

  The battery back-up (BBU) model: admin enables write-back cache with BBU writes are cached to the RAID controller's RAM (major performance benefit) the battery saves uncommitted and cached data in the event of a power loss (reliability) If I lose power and come back within a day or so, my data should be both complete and uncorrupted. The downside to this is that, if the battery is dead or low, OR EVEN IF IT IS IN A RELEARN CYCLE (drain/charge loops to ensure the battery's health), the controller reverts to write-through mode and performance will suffer. What's more, the relearn cycles are usually automated on a schedule which may or may not happen in the middle of big traffic. So, that has to be manually disabled and manually scheduled for off-hours if it's a concern. Annoying either way. NV caches have capacitors with a sufficient charge to commit any uncommitted-to-disk data to flash. Not only is that more survivable in longer loss situations, but you don't have to concern yourself with battery death, wear-out, or relearning. All of that sounds great to me. What doesn't sound great to me is the prospect of that flash module having an issue, though. What if it's completely hosed? What if it's only partially hosed? A bit corrupted at the edges? Relearn cycles can tell when something like a simple battery is failing, but is there a similar process to verify that the flash is functional? I'm just far more trusting of a battery, warts and all. I know the card's RAM can fail, the card itself can fail - that's common territory, though. In case you didn't guess, yeah, I've experienced a shocking-to-me amount of flash/SSD/etc. failure :)

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• Centos 5.5 install PearDB

  - by John Gardeniers

  Disclaimer: I use Linux for some jobs but I am not a Linux admin. I have a Centos 5.4 machine which performs some server duties and doubles as a web site development machine. PHP 5.3.3 was installed from RPM with the --without-pear option. I now wish to use PearDB but can't figure out how to install it. If I run yum install php-pear-db, it comes back with Error: Missing Dependency: php = 5.1.6-27.el5_5.3 is needed by package php-devel-5.1.6-27.el5_5.3.i386 (updates). The only RPM I've found that looks like it might be close currently has a dead link, so I can't even try that. What would be the best way to go about this? Is there a way to reinstall from the RPM and include pear? Can I install the dependency without breaking the current installation? Should I try to uninstall the original PHP and reinstall it from source, complete with pear? I thought this might have been an SU question but the FAQ over there suggests otherwise.

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• Windows 7 clean install becomes corrupt after reboot (repeated many fresh installs)

  - by pjotr_dolphin

  My laptop keeps crashing on boot after clean Windows 7 install. Ok, here is the story, and some fact. Computer: Samsung NP900X3C-A04HK (256GB SSD, 8GB RAM) OS to install: Windows 7 Ultimate SP1 (not from Samsung, own fresh Win) I purchased this laptop about a year ago, never booted it into the Windows Home that was installed on it, installed directly Ubuntu on the machine. Full disc encryption was the selected install, so of course it wiped the complete disc (including Samsung Recovery Partition). After some time, I felt like going back to Windows, as Windows 7 is actually quite nice. So I went to buy a fresh Windows 7Ultimate with SP1. Now to the tricky part. Windows installs perfectly, and after installing all Windows updates, drivers from Samsung, software I need, it is time for shutting it down and go to bed. Starting it up again, and it is not booting, these are the type of errors I have gotten so far (fresh installed it more then a dozen times now, and tried different suggestions from threads on the net). Windows failed to start... Status: 0xc000000f Info: The boot selection failed because a required device is inaccessible. File: /boot/bcd Status: 0xc000000f Info: an error occurred while attempting to read the boot configuration data. And some other errors, not all the same. Not memory of this. I have run different disc checks, and all says my SSD is in perfect shape. Note: Soft reboots from Windows menu works, never gets corrupted. But if I Shutdown and then start it up again, this is when it happens. Can someone help me not get back to Ubunut? What can be the cause, and how can it be fixed so I do not get there problems again?

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• Some Portions of Computer Running Slow (Specifically Graphics)

  - by Mike Gates

  I noticed that a few things are running slow today on my Windows 7 laptop. Specifically, they are: Opening and closing windows takes several seconds for the animation to complete. Windows media player opens fine, but the movies are very laggy MMORPG's, such as RuneScape, are extremely laggy When waking my computer from sleep mode, after entering my password, my desktop takes about 3 seconds to fade in Other than those, everything runs at a normal speed. Things I've done that maybe contributed to this problem: Changed the graphics processor (by plugging in/unplugging the charger) [however, no matter how I change the graphics, I'm still getting this lagginess] Installed AdBlock, a Firefox addon [I recently removed it, and I'm still experiencing this problem] Went into Advanced System Settings, Clicked Settings, and unchecked a few visual things (such as the animation for opening and closing windows) [sure, this got rid of the opening/closing windows lag, but I like that little animation - plus that leaves all the other lag problems I'm experiencing] So, does anyone have any ideas/fixes? If so, please respond. Thank you. Some Other Information: I'm on a HP Pavillion dv7 laptop, 4285 Entertainment PC, with: intel CORE i5 inside, ATI Mobility Radeon Premium Graphics, Microsoft DirectX11 Opening and closing of windows: Defined as opening a program (i.e. Firefox) or closing it by hitting the X in the upper-right hand corner. Lately, the animation for opening and closing windows (which is simply either growing from the icon from the taskbar to fill the screen, or shrinking from the screen down towards the icon on the toolbar.) This problem also occurs for minimizing/maximizing windows. Very laggy movies: defined as .avi movie files saved to My Documents which skips several frames per second and seemingly slows down the movie as a whole Extremely laggy games: I tried RuneScape today, and movement in the game was at least 10x slower than it ever has been, even when playing on the lowest detail/graphics Desktop taking 3 seconds to fade in after sleep: in this scenario, I had no other programs running visibly. The computer generally fades to black from the password screen to the desktop in about 1 second, normally. However, it is now taking 3 or more seconds.

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• How to manage enterprise network of Linux machines?

  - by killy9999

  I work at the university. In my institute we have six computer laboratories used for teaching. Each lab has almost 20 computers, which gives over 100 machines total. Computers have either Windows XP or Windows 7 Eneterprise operating system. We use Symantec Ghost to manage all the computers. Each computer has a Ghost client installed, which allows to control computers over network. Every six months we restore a master image on one of the computers in a lab, update that image and distribute it over the network to all computers in a laboratory. Thanks to Ghost client this is done automatically with just a few clicks. Recently I suggested that it would be good to have Linux installed in the laboratories. The administrators were concerned that we would not be able to manage that many computers if each would have to be updated manually. The question is: how to manage such a huge network of Linux machines in an automated way? To make the description of our network more complete I'll add that all students have their accounts (about few thousand users) on a central server. These are accessed via LDAP. To use a computer in laboratory each student has to log in using his own account.

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• Inexpensive (used) hardware for Xen virtualization test?

  - by Jason Antman

  Virtualization is one of the areas where I could really use some experience. I also run quite a few services (web, mail, dns, etc.) out of my home. Since most of my hardware is getting a bit old (I'm running on stuff that was surplused years ago...) I decided that it's about time I start renewing some things, and also play around with virtualization a bit more. My plan is to setup a SAN box (simple iSCSI target, relatively inexpensive gigE switch), get a pair (for starters) of new servers, and start building some new stuff with Xen, specifically planning on playing with live migration and full virtualization. Does anyone have recommendations for used, older "servers" (really anything in a rack-mount form factor, I'm not too worried about things like iLO/iLOM for the test nodes) that support VT-x/AMD-V? I'm biased to HP, but it looks like they didn't make Proliants with VT-x/Vanderpool processors until G6 (for the DL360) or so, which is way out of my price range. I'm looking in the sub-$300 range (or less, if possible), used, probably Ebay. Any recommendations are greatly appreciated. Edit:And, to catch this before the comments start coming - these are personal systems. I have first-generation Proliants still in use (I got them as corporate surplus in 05, they've been running since then, and probably were running since 01 or 02 prior to being sold). I don't need anything shiny and new - I've got a bunch of old boxes, at least one complete replacement for every model in use, and that's fine for me (and easy on the wallet).

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