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• How much does a computer actually cost?

  - by Cawas

  Ok, so when you buy a new notebook, you spend about $1 or $2 thousand with the OS included. When you make your own desktop machine you can get as low as $100 for a good one today, with not a single piece of software included. It can't be much lower, but it can go lot higher. People, including myself, tend to believe that's the price of a computer, but then there comes the softwares. I just stumbled upon a nice piece of application I could use myself, but it's very specific, very tiny, and most people would never bother about this. And it costs "just $12". That is a lot for something I may use just once or twice! OS upgrades, hardware malfunction, and your custom set of software actually raise the computer price quite a lot, thus this question: how much we pay in the end for our personal computers? I'd like to see some statistics on that. Maybe divided into 3 categories or something, but some data with averages, minimum and "maximum" costs would be very nice. Maybe a "cost per year" would be nice. Just wondering.

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• Google-Bot fell in love with my 404-page

  - by 32bitfloat

  Every day my access-log looks kind of this: 66.249.78.140 - - [21/Oct/2013:14:37:00 +0200] "GET /robots.txt HTTP/1.1" 200 112 "-" "Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)" 66.249.78.140 - - [21/Oct/2013:14:37:01 +0200] "GET /robots.txt HTTP/1.1" 200 112 "-" "Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)" 66.249.78.140 - - [21/Oct/2013:14:37:01 +0200] "GET /vuqffxiyupdh.html HTTP/1.1" 404 1189 "-" "Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)" or this 66.249.78.140 - - [20/Oct/2013:09:25:29 +0200] "GET /robots.txt HTTP/1.1" 200 112 "-" "Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)" 66.249.75.62 - - [20/Oct/2013:09:25:30 +0200] "GET /robots.txt HTTP/1.1" 200 112 "-" "Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)" 66.249.78.140 - - [20/Oct/2013:09:25:30 +0200] "GET /zjtrtxnsh.html HTTP/1.1" 404 1186 "-" "Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)" The bot calls the robots.txt twice and after that tries to access a file (zjtrtxnsh.html, vuqffxiyupdh.html, ...) which cannot exist and must return a 404 error. The same procedure every day, just the unexisting html-filename changes. The content of my robots.txt: User-agent: * Disallow: /backend Sitemap: http://mysitesname.de/sitemap.xml The sitemap.xml is readable and valid, so there seems to be no reason why the bot should want to force a 404-error. How should I interpret this behaviour? Does it point to a mistake I've done or should I ignore it?

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• Windows XP can use a wired network port, but MacBook (OS X) fails on the same port

  - by Dean Hill

  I wired the Cat5 in my house seven years ago. The wired ports have worked fine with both my Windows XP laptop and MacBook. My wireless network also works fine, but I like to use wired occasionally. One of the Cat5 runs wasn't terminated with a jack, so I recently terminated this wire with a port/jack on the wall end and a standard Cat5 plug on the end that plugs into my router. This is the same setup as my other runs. Unfortunately, the MacBook isn't working well with the new wired port. The OS X Network System Preferences show the IP, Subnet, Router, etc., and everything looks fine. A "netstat -ibd" shows no errors or dropped packets. However, when I open a page in Safari, the status says "Contacting 'www.google.com'" and appears to hang. If I wait for a couple minutes, part of the Google page starts to display, but it is still not the full page load. When I use a Windows XP laptop on the same wired port, everything works fine. An internet speed test shows good results and all web pages load fine. A "netstat -e" under Windows shows no errors. I've used a Cat5 tester, and the cable tests fine (wires 1-8 light up in sequence). I've replaced both the port/jack and the connector twice to make sure I wired things correctly. I'd really like this Cat5 to work with the MacBook (and I'm trying to avoid running a new length of cable). Any ideas what the problem could be?

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• Performance Test and TCP tuning

  - by Mithir

  We are in the process of performance testing an application which receives tcp requests converts them to soap requests (WCF-httpBinding) which other services work on. The server is Windows Server 2008 R2. The TCP requests are received by TcpListener instance (.NET C#). There are 3 http-binded WCF services running on the same server. We have built a performance test client which goal is to simulate multiple concurrent requests(each request has to be different and recognizable by the application). We built a test running 150 requests that run on the same time (by 150 different threads), and we noticed straight away that some requests get the TCP connection slowly, but once they get it, they act fast. A single request writes twice on the same connection- request and an application ack. Although a single request+ack can take about 150ms, the 150 test takes about 7 seconds. The Problem When we try to run this test from 2 different computers we lose requests. some clients requests are getting no connection was made because the target machine actively refused it So I got here and got convinced it was because of the backlog. I changed the TcpListener parameters and did the registry AFD backlog changes written here but it still didn't work, so I inserted all of the TCP tuning suggested plus some netsh commands which were recommended, but still no change, we still get that error. Is there anything else I need to know? Are there any other solutions?

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• Pure Terminal Server 2003 system hangs

  - by Donovan

  System Profile: IBM Server hardware Windows Ent Server 2003 running terminal services. No Citrix. Max user load: 30 Symptoms: While in the course of normal operation our terminal server will hang up. As far as I can tell there isn't any trigger that's plainly visible yet. The way in witch it hangs may give a clue though. The hang presents its self by users not being able to initiate any new processes. All processes currently loaded into memory work just fine. Example: outlook 2007. You may continue to read email, operate the client and such. Some people don't even realize the hang has occurred for a bit of time. My attempts to troubleshoot have been futile. Reacting to the hang does no good because I can't start any new processes to investigate. After I reboot the server my next instinct would be to begin logging to catch the hang occurring but I'm not sure what to log. Right now I'm attempting to keep process explorer running in case the issue occurs again. Sometimes it happens twice a day, other times, once a week. Anyone have any ideas on how I could set myself up for better success in tracking this problem down? Thanks, Donovan

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• changing filesystem format from xfs to ext4 without losing data

  - by A.Rashad

  I have a fresh Lucid Lynx (Ubuntu 10.04) running on a laptop. where I defined the filesystems as: mount point / on ext4 (46 Gb) mount point /home on jfs (63 GB) swap as 3 Gb I left the machine over night to do some task, without AC power supply. next day in the morning I found it on standby, task completed, but filesystem was not reachable. it gave me I/O error it seems that there is a problem with jfs and standby. anyways, to avoid any hassle, I want to move this mount point from jfs format to ext4. can I do this without losing data and without the need to place the data in a temporary location until transformation is done? sorry to mention that, but I recall back in the windows days, we would change a FAT16 to FAT32 or a FAT32 to NTFS without having to lose the data. I hope this is available on Linux. Update The /home filesystem was xfs not jfs, and it seems there is a bug with this filesystem for some reason, I had to re-install the OS twice until I ended up with ext4 for the entire / However, as a conclusion, it seems that there is no way to make a conversion

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• Home server hard drive: 186k start-stop cycles in 325 days?

  - by j-g-faustus

  I set up a home server about a year ago, using Ubuntu server (10.04 LTS at the moment), four disks in RAID 5 for storage (WD Green 1.5 TB) and a laptop drive for the OS. Today the output of smartctl, a command line utility for checking the SMART attributes of a hard drive, tells me that the primary OS drive has had no less than 186,000 start-stop cycles in 325 days and may be nearing the end of its lifespan. The smartctl output is in "normalized values", in this case a number between 200 and 000, where 200 is "brand new" and 000 means "worn out". My disk gets 001. So I wonder what happened: 186k start/stop cycles in 7820 hours is about one start/stop per 2.5 minutes around the clock. This seems somewhat excessive for a computer that sees actual use once or twice per day. (The RAID disks are normal, averaging to one start/stop per day, as expected.) Does anyone have similar experiences, or pointers to what might be the issue here? Specifically I'd like to know Why the massive start/stop count? Do I have some sort of configuration issue? Could there be a background service that is causing trouble? Could having a laptop disk as the OS drive be part of the problem? Can anyone confirm or deny this? Here is the /etc/hdparm.conf configuration /dev/sda { apm = 127 spindown_time = 120 } and the most relevant parts of smartctl --attributes /dev/sda: smartctl version 5.38 [x86_64-unknown-linux-gnu] Copyright (C) 2002-8 Bruce Allen === START OF READ SMART DATA SECTION === SMART Attributes Data Structure revision number: 16 Vendor Specific SMART Attributes with Thresholds: ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE 1 Raw_Read_Error_Rate 0x002f 200 200 051 Pre-fail Always - 0 4 Start_Stop_Count 0x0032 001 001 000 Old_age Always - 185875 9 Power_On_Hours 0x0032 090 090 000 Old_age Always - 7820 12 Power_Cycle_Count 0x0032 100 100 000 Old_age Always - 109 193 Load_Cycle_Count 0x0032 118 118 000 Old_age Always - 246833 194 Temperature_Celsius 0x0022 107 098 000 Old_age Always - 36 As I generally prefer my drives to last more than a year, any advice is appreciated.

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• Identify differences between MP3 files

  - by Thingomy

  I have 2 old similar directory trees with MP3 files in them. I am happily using tools like diff and Rsync to identify and merge the files that are only present on one side, or are identical, I'm left with a bunch of files that are bitwise different. On running diff over a pair actually different files, (with -a tag to force text analysis) it produces incomprehensible gibberish. I have listened to files from both sides, and they both seem to play fine (but at nearly 10 minutes per song, when listening to them twice each, I haven't done many) I suspect the differences are due to some player in the past "enhancing" my collection by messing about with ID3 tags, but I can't be certain. Even if I identify differences in ID3 tags, I would like to confirm that no cosmic ray or file copy error issues have damaged any of the files. One method that occurs to be is finding the byte locations of the differences, and ignoring all changes in the first ~10kb of each file, but I don't know how to do this. I have on the order of a hundred or so files that differ across the directory tree. I found How to compare mp3, flac audio data in a file, ignoring header data (ID3 tag) etc.? -- but I can't run alldup due to being Linux only, and from the sounds of it, it would only partially solve my issues anyway.

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• How can I track down the cause of ext3 filesystem corruption?

  - by Jon Buys

  We have a VMware vSphere 5 environment running CentOS 5.8 virtual machines. In the past two weeks we have had five incidents of virtual machines having a filesytem become corrupt, requiring an fsck to repair. Here is what we see in the logs: Nov 14 14:39:28 hostname kernel: EXT3-fs error (device dm-2): htree_dirblock_to_tree: bad entry in directory #2392098: rec_len is smaller than minimal - offset=0, inode=0, rec_len=0, name_len=0 Nov 14 14:39:28 hostname kernel: Aborting journal on device dm-2. Nov 14 14:39:28 hostname kernel: __journal_remove_journal_head: freeing b_committed_data Nov 14 14:39:28 hostname last message repeated 4 times Nov 14 14:39:28 hostname kernel: ext3_abort called. Nov 14 14:39:28 hostname kernel: EXT3-fs error (device dm-2): ext3_journal_start_sb: Detected aborted journal Nov 14 14:39:28 hostname kernel: Remounting filesystem read-only Nov 14 14:39:28 hostname kernel: EXT3-fs error (device dm-2): htree_dirblock_to_tree: bad entry in directory #2392099: rec_len is smaller than minimal - offset=0, inode=0, rec_len=0, name_len=0 Nov 14 14:31:17 hostname ntpd[3041]: synchronized to 194.238.48.2, stratum 2 Nov 14 15:00:40 hostname kernel: EXT3-fs error (device dm-2): htree_dirblock_to_tree: bad entry in directory #2162743: rec_len is smaller than minimal - offset=0, inode=0, rec_len=0, name_len=0 Nov 14 15:13:17 hostname kernel: __journal_remove_journal_head: freeing b_committed_data The problem seems to happen while we are rsync'ing application data from another server. So far we have been unable to reproduce the problem, or identify a root cause. After we had a few servers have this problem, we assumed that there was an issue with the template, so we scrapped all VM's cloned off of the template, destroyed the template, and built a new template from scratch, installed from a newly downloaded CentOS ISO. We use HP EVA SAN's for datastores, and moved from a 4400 to a 6300 after the first problem. Since the move and rebuilding new virtual machines we have seen the issue twice. On one VM we shut down the server, removed two virtual CPUs, and booted it back up again, the problem presented itself almost immediately. On the other VM, we rebooted it, and the problem happened a half hour later. Any tips or pointers in the right direction would be appreciated.

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• Chrome's new window disappear from desktop

  - by faulty

  I'm having this problem with Chrome on a Windows 7 x86 machine. I'm using Chrome for a locally hosted intranet web app. In the web app, there's frequent use of new window which popup, which works like a dialog box for the app. The problem started since yesterday. All the new windows doesn't appear on top and no where to be found on the desktop. But it does appear on the taskbar. Clicking the button on the taskbar doesn't bring up the window as well. I've also tried Alt+Space, then Move, it doesn't work. I only found 2 way to bring it up, Maximize or Show as tab. What could have caused this and how should I fix it? Thanks EDIT: I've configure to not group taskbar buttons. EDIT: I've just gone through the javascript of the button, it call window.open to display the popup. I can see the popup flicker and disappear. If I step through the code, the popup will display properly, sometime. Also, if I click the button twice, it will also display the popup, but at a much smaller size, less than 100x100

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• What is the fastest and best way to convert an rmvb video to mp4/mkv without losing any quality?

  - by Eric Leung

  the file will be played in a popbox3d. my old method was to convert the video using vidcoder (an offshoot of handbrake) using normal settings, but i've recently confirmed that this significantly reduces video and audio quality. i bumped up the conversion quality to 'high profile' and this produced a higher quality video but raised the conversion time to about twice the video length (95 minutes to convert a 45 minute video) on a core2duo laptop. this is less than ideal when a large number of videos need to be converted. i have tried a direct remuxing using mkv toolnix but this produced a video that refused to display video on the popbox3d, which is consistent with the reported: [quote=other old thread] it is possible to put RealMedia A/V in MKV container (used MKVtoolnix) - however, it is awkward to play later. RV40 is only suspected to be based on H.264 - simplify, is not consistent with MPEG-4 AVC specification. [/quote] i have read that ... [quote=from old thread] Under normal circumstances, [ffmpeg] should convert the video to .video.mp4 and the audio to (.wav then to) .audio.mp4, then mux the video and audio into a new .mp4 file and delete the temporary video-only and audio-only files.[/quote] and i am currently attempting to discover how this is done. help? PS: i download a lot of series from asia and for some strange reason, rmvb is a really popular format over there. sometimes, it's the only format that's available. unfortunately, it's a format that is incompatible with the popbox3d, so i have to convert the files before i can watch them on my tv.

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• how to authenticate once for multiple servers, using only apache configs?

  - by Wang

  My problem is, I have a number of prepackaged web apps (a print system, a wiki, a bug tracker, an email archive, etc.) running on different Mac OS X Leopard (soon to be SL) servers that each need to authenticate users from the internet at large. Right now every server presents an Apache basic authentication prompt, which takes a shared login, but it's apparently enough of an inconvenience to log in repeatedly that people are sending email without checking the wiki or bug tracker or archive. In the case of the bug tracker, a user [might need to log in twice---once for apache if he hasn't used any other protected service on that server, once for the bug tracker itself so it can distinguish different people. Since the only common component to all these apps is Apache 2 itself, does it have any way of authenticating a user once, in some way that will be respected by other servers and various web apps? Looked at http://serverfault.com/questions/32421/how-is-session-stickiness-achieved-across-multiple-web-servers but it sounds like the answer is assuming that I get to write my own web app. Looked at Ian Bicking's blog but it's four years old and recommends something available only for apache 1.3, not apache 2. Sorry not to hyperlink the second site---apparently I need 10 reputation points. Edit: Shibboleth does what I need, but I should have specified that I'm looking for a really dumb, really simple solution for in-house services that need to handle all of a dozen users, probably not more than three at a time.

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• Add and remove letterhead in Word document

  - by Daniel Wolf

  Our company has letterheaded paper (pre-printed paper with our logo on it). Whenever we send something out by mail, we print it on that paper. However, when we send the same document via email, we convert it to a PDF file. Now the problem is: when converting a Word document to PDF, it should contain the letterhead. When printing the same document on paper, it should not (or else the letterhead would be printed twice). Currently, we are using two different Word document templates - one with letterhead, one without. So whenever we want to add or remove the letterhead, we have to create a new document with the other template and copy and paste everything over. Nasty solution. What I'm looking for is some simple way to switch the letterhead on and off. What I've tried so far: Switching the template: There does not seem to be a simple way to switch the template for an existing document. Using a picture watermark: Our letterhead goes all the way to the border of the page. (No printer supports this, of course, but it is fine for export to PDF.) Apparently depending on the current default printer, Word will not allow a borderless watermark, instead shifting the image around. Using the page header: When editing the page header, I can insert pictures at arbitrary positions, which is great. However, I could not find a way (short of macros) to enable/disable just the pictures in the header. (The text should remain there.)

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• Adobe Acrobat Reader don't zoom out the page enough in "one page" mode

  - by mbaitoff

  I'm using Adobe Acrobat Reader version 9.4 under Debian Lenny. I'm experiencing a problem: when I push the "Show one page at a time" button, I expect the page to zoom such that pressing PgUp/PgDn would turn to the next/previous page. However, the zoom seems to be not enough - very thin bottom portion of the page doesn't fit inside the reader window, and pressing PgUp/PgDn gives the jitter of the same page, and I have to push twice to get to the next page. It is even worse in continuous page mode - a roll of pages begin to be non-synced with window boundaries, ending up with page break right in the middle of the view after several turns of the pages. This behaviour doesn't occur on windows version - I have a page properly zoomed in single/continuous modes, so that turning the pages is performed as page-at-once, as intended. How to make the Acrobat Reader fit the page to window properly? Thats how it looks before pressing PgDn (notice the bottom edge of the "paper" hidden beneath the bottom window edge): Thats how it looks after pressing PgDn (notice the "paper" bottom edge emerged from beneath the window edge, while the "paper" upper edge hides behind the upper window edge, showing that the document window size is not enough to contain the whole page):

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• Typical outbound port list for guest access?

  - by Steve

  I manage a weekly rental house that includes wireless Internet access. I've allowed all outbound ports on my router but my ISP has disabled my Internet access twice now because guests have downloaded (or served up) copyrighted content. So I'd like to institute some port filtering to discourage p2p sharing (see disclaimer below). But I don't want to inconvenience the 99.9% of folks who keep things above-board. My question is, what outbound ports are typically open for rental/hotel wireless Internet access, or where can I find such a list? TCP 80,443,25,110 at a minimum. Though my own email service uses 995 and 465 for SSL, some may use IMAP, I personally use SSH and FTP, so I'll open those. Roughly I figure I need to open access to privileged ports, and close 1024 & above. Is there a whitelist I should institute for commonly used high ports? And does it make sense to block UDP 1024 ? Disclaimer: I realize anyone replying to this message could circumvent the port filtering and share content to their heart's content. I do not need comprehensive p2p blocking, which requires more than a port whitelist. Anyone staying at the house shoulders the responsibility for their Internet use, per the rental contract. Also anyone savvy enough to circumvent the port filters would hopefully be savvy enough to use some sort of peer blocking, thereby preventing the ISP from taking down the service.

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• Can anyone explain these differences between two similar i7 processors? [closed]

  - by Brian Frost

  I have two systems I've just built. They both have i7 processors and Asus P8Z77 motherboards. When I run a simple processor loop benchmark that I wrote in Delphi some time back I get one machine showing nealry twice as fast as the other. I then used CPU-Z to dump me the details of the hardware and I see that the fast machine shows: Processor 1 ID = 0 Number of cores 4 (max 8) Number of threads 8 (max 16) Name Intel Core i7 2700K Codename Sandy Bridge Specification Intel(R) Core(TM) i7-2700K CPU @ 3.50GHz Package (platform ID) Socket 1155 LGA (0x1) CPUID 6.A.7 Extended CPUID 6.2A Core Stepping D2 Technology 32 nm TDP Limit 95 Watts Core Speed 3610.7 MHz Multiplier x FSB 36.0 x 100.3 MHz Stock frequency 3500 MHz the slow machine shows: Processor 1 ID = 0 Number of cores 4 (max 8) Number of threads 8 (max 16) Name Intel Core i7 2600K Codename Sandy Bridge Specification Intel(R) Core(TM) i7-2600K CPU @ 3.40GHz Package (platform ID) Socket 1155 LGA (0x1) CPUID 6.A.7 Extended CPUID 6.2A Core Stepping D2 Technology 32 nm TDP Limit 95 Watts Core Speed 1648.2 MHz Multiplier x FSB 16.0 x 103.0 MHz Stock frequency 3400 MHz i.e the slow machine has a 2600k to the fast machine 2700k. The very different "Multiplier x FSB" must be significant but I dont understand how two processors with a very 'similar' number can be so different. To get the machines the same must I copy the processors or is there some clever setting that I can change? Thanks for any help. Brian.

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• x86_64 and memory issues

  - by Valery

  Recently I've switched from ubuntu 32bit to 64bit version. And now I experiencing some problems. All application take twice more memory. And some application takes even more. For example sshd on new server: root 6608 0.0 0.0 67972 2912 ? Ss 14:43 0:00 sshd: deploy [priv] deploy 6616 0.0 0.0 67972 1724 ? S 14:43 0:00 sshd: deploy@pts/4 root 20892 0.0 0.0 50916 1160 ? Ss 15:53 0:00 /usr/sbin/sshd root 21170 0.0 0.0 67972 2912 ? Ss 15:56 0:00 sshd: deploy [priv] deploy 21173 0.0 0.0 67972 1728 ? S 15:56 0:00 sshd: deploy@pts/0 root 23802 0.0 0.0 67972 2912 ? Ss 16:08 0:00 sshd: deploy [priv] deploy 23804 0.0 0.0 67972 1724 ? S 16:08 0:00 sshd: deploy@pts/1 root 24570 0.0 0.0 67972 2908 ? Ss 12:45 0:00 sshd: deploy [priv] deploy 24573 0.0 0.0 68112 1804 ? S 12:45 0:00 sshd: deploy@pts/3 deploy 25014 0.0 0.0 5168 852 pts/0 S+ 16:13 0:00 grep ssh the same on the old server: root 4867 0.0 0.0 5312 1028 ? Ss Mar23 0:00 /usr/sbin/sshd root 23753 0.0 0.0 8052 2556 ? Ss 16:15 0:00 sshd: deploy [priv] deploy 23755 0.0 0.0 8052 1524 ? S 16:15 0:00 sshd: deploy@pts/0 deploy 23770 0.0 0.0 3004 748 pts/0 D+ 16:15 0:00 grep ssh The same problems with postfix, nginx and some other application.

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• Xen domain migration locking problem

  - by brodie

  I am trying to live migrate a VM (domain) between two Xen servers. I have xen locking (xend-domain-lock = yes) configured with a ocfs2 shared storage between them. This locking is working fine. If I try to start up the VM on the secondary server it refuses to start (which is correct). The problem I am having is when trying to do live migration, it seems like it is trying to remove the lock twice. The first lock it removes is for "domain test", the second is for "migrating-test" which does not exist. Should their be a lock for this "migrating-test" VM? These are the relevant options in the xen config file: (xend-relocation-server yes) (xend-relocation-port 8002) (xend-relocation-address '') (xend-relocation-hosts-allow '') (xend-domain-lock yes) (xend-domain-lock-path /var/lib/xen/lock) This is the section of the log: [2010-06-10 10:45:57 14488] DEBUG (XendDomainInfo:4054) Releasing lock for domain test [2010-06-10 10:45:57 14488] INFO (XendCheckpoint:474) SUSPEND shinfo 000c6ceb [2010-06-10 10:45:57 14488] INFO (XendCheckpoint:474) delta 21ms, dom0 95%, target 0%, sent 57Mb/s, dirtied 173Mb/s 111 pages 4: sent 111, skipped 0, delta 6ms, dom0 100%, target 0%, sent 606Mb/s, dirtied 606Mb/s 111 pages [2010-06-10 10:45:57 14488] INFO (XendCheckpoint:474) Total pages sent= 131295 (0.99x) [2010-06-10 10:45:57 14488] INFO (XendCheckpoint:474) (of which 0 were fixups) [2010-06-10 10:45:57 14488] INFO (XendCheckpoint:474) All memory is saved [2010-06-10 10:45:57 14488] INFO (XendCheckpoint:474) Save exit rc=0 [2010-06-10 10:45:57 14488] INFO (XendCheckpoint:123) Domain 22 suspended. [2010-06-10 10:45:57 14488] DEBUG (XendDomainInfo:2757) XendDomainInfo.destroy: domid=22 [2010-06-10 10:45:58 14488] DEBUG (XendDomainInfo:2227) Destroying device model [2010-06-10 10:45:58 14488] INFO (image:567) migrating-test device model terminated [2010-06-10 10:45:58 14488] DEBUG (XendDomainInfo:2234) Releasing devices [2010-06-10 10:45:58 14488] DEBUG (XendDomainInfo:2247) Removing vif/0 [2010-06-10 10:45:58 14488] DEBUG (XendDomainInfo:1137) XendDomainInfo.destroyDevice: deviceClass = vif, device = vif/0 [2010-06-10 10:45:58 14488] DEBUG (XendDomainInfo:2247) Removing vkbd/0 [2010-06-10 10:45:58 14488] DEBUG (XendDomainInfo:1137) XendDomainInfo.destroyDevice: deviceClass = vkbd, device = vkbd/0 [2010-06-10 10:45:58 14488] DEBUG (XendDomainInfo:2247) Removing console/0 [2010-06-10 10:45:58 14488] DEBUG (XendDomainInfo:1137) XendDomainInfo.destroyDevice: deviceClass = console, device = console/0 [2010-06-10 10:45:58 14488] DEBUG (XendDomainInfo:2247) Removing vbd/51712 [2010-06-10 10:45:58 14488] DEBUG (XendDomainInfo:1137) XendDomainInfo.destroyDevice: deviceClass = vbd, device = vbd/51712 [2010-06-10 10:45:58 14488] DEBUG (XendDomainInfo:2247) Removing vfb/0 [2010-06-10 10:45:58 14488] DEBUG (XendDomainInfo:1137) XendDomainInfo.destroyDevice: deviceClass = vfb, device = vfb/0 [2010-06-10 10:45:58 14488] DEBUG (XendDomainInfo:4054) Releasing lock for domain migrating-test [2010-06-10 10:45:59 14488] ERROR (XendDomainInfo:4070) Failed to remove unmanaged directory /var/lib/xen/lock/b01515ae-9173-03cb-0cb7-06f3dfbede8b.

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• Real benefits of tcp TIME-WAIT and implications in production environment

  - by user64204

  SOME THEORY I've been doing some reading on tcp TIME-WAIT (here and there) and what I read is that it's a value set to 2 x MSL (maximum segment life) which keeps a connection in the "connection table" for a while to guarantee that, "before your allowed to create a connection with the same tuple, all the packets belonging to previous incarnations of that tuple will be dead". Since segments received (apart from SYN under specific circumstances) while a connection is either in TIME-WAIT or no longer existing would be discarded, why not close the connection right away? Q1: Is it because there is less processing involved in dealing with segments from old connections and less processing to create a new connection on the same tuple when in TIME-WAIT (i.e. are there performance benefits)? If the above explanation doesn't stand, the only reason I see the TIME-WAIT being useful would be if a client sends a SYN for a connection before it sends remaining segments for an old connection on the same tuple in which case the receiver would re-open the connection but then get bad segments and and would have to terminate it. Q2: Is this analysis correct? Q3: Are there other benefits to using TIME-WAIT? SOME PRACTICE I've been looking at the munin graphs on a production server that I administrate. Here is one: As you can see there are more connections in TIME-WAIT than ESTABLISHED, around twice as many most of the time, on some occasions four times as many. Q4: Does this have an impact on performance? Q5: If so, is it wise/recommended to reduce the TIME-WAIT value (and what to)? Q6: Is this ratio of TIME-WAIT / ESTABLISHED connections normal? Could this be related to malicious connection attempts?

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• Cache-control for permanent 301 redirects nginx

  - by gansbrest

  I was wondering if there is a way to control lifetime of the redirects in Nginx? We would liek to cache 301 redirects in CDN for specific amount of time, let say 20 minutes and the CDN is controlled by the standard caching headers. By default there is no Cache-control or Expires directives with the Nginx redirect. That could cause the redirect to be cached for a really long time. By having specific redirect lifetime the system could have a chance to correct itself, knowing that even "permanent" redirect change from time to time.. The other thing is that those redirects are included from the Server block, which according the nginx specification should be evaluated before locations. I tried to add add_header Cache-Control "max-age=1200, public"; to the bottom of the redirects file, but the problem is that Cache-control gets added twice - first comes let say from the backend script and the other one added by the add_header directive.. In Apache there is the environment variable trick to control headers for rewrites: RewriteRule /taxonomy/term/(\d+)/feed /taxonomy/term/$1 [R=301,E=expire:1] Header always set Cache-Control "store, max-age=1200" env=expire But I'm not sure how to accomplish this in Nginx.

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• PC freezes after repeated clicking noises

  - by Péter Török

  I have an oldish PC (Athlon XP 2200, WinXP). Every time I switch it on, I hear a loud "click" first of all, and when it is shut down, again a click is the last sound I hear. Lately it started to behave erratically: it started to click loudly in the middle of a session. First only once in a while, then repeatedly for several seconds in a row, and finally it froze completely. We were not doing anything particular during these times, usually just browsing the web. This has already happened twice in a few week's time period. We typically use it only in the evenings, so when the freeze happened, I just decided it is time for the bed. When it was started up the next day, everything looked fine. Any hints on what could be the culprit? Could it be caused by an ageing heat fan, or dust that has accumulated inside the case? We are backing up all the data stored on it, and then will open the case to look inside, but I thought it would be good to get some background info first of all.

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• Virus ridden computer freezes on startup - can't access safe mode

  - by Eric

  Someone whom I love but who cannot be trusted with a live internet connection downloaded a particularly nasty virus that in turn downloaded a variety of unknown other viruses onto my home computer. The computer now freezes completely a few seconds after reaching the desktop and is unresponsive to any keyboard or mouse command. There are videos of my little kid on this hard drive that are not backed up and that I cannot bear to lose. But if I could get in there long enough to copy them off to an external drive I would have no problem doing a clean windows install to fix the problem; everything else is backed up online but the videos were too large. Normally I would start by going into safe mode but I have a large Dell monitor that doesn't show anything until the welcome screen appears. I think that I have gotten into the setup screen once or twice by mashing keys before I can see anything, but this monitor doesn't support that so I can't see what I'm doing to get it to boot from CD or anything else. I'm at my wits end. Any advice?

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• Adding users to Sharepoint when they are not in the same domain

  - by jim-work

  Bear with me as I explain this, I'm working my way through Sharepoint access as I go, but I'll clarify my question as I go along. The Problem We have about 10,000 users who need access to our Sharepoint 2005 based reporting. Because our organization is migrating from one domain to another, we need to add each user twice, once for each domain. For the current domain, this is no problem, we've got a powershell script that I tweaked to add all the users in a given CSV file, this takes about 5 minutes to run. The big problem we're having is with users who are NOT in our currently active domain. Because the sharepoint server cannot authenticate the new users, we can't add them directly. What we're doing is creating a temp user, then using STSADM.EXE to migrate that test user to the proper domain/user_name for each of our 10,000 users. The creation and migration takes about 5 seconds per user, or well over 12 hours to run. The Question Has anyone encountered this before? Is there a way to add users without requiring AD authentication? Why is STSADM.EXE running so slow? Thanks a lot for any advice or direction anyone can give me.

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• netstat on fresh install of Solaris 10 update 9

  - by cjavapro

  I am attempting to decipher the below output bash-3.00$ netstat -a UDP: IPv4 Local Address Remote Address State -------------------- -------------------- ---------- *.sunrpc Idle *.* Unbound *.32771 Idle TCP: IPv4 Local Address Remote Address Swind Send-Q Rwind Recv-Q State -------------------- -------------------- ----- ------ ----- ------ ----------- *.* *.* 0 0 49152 0 IDLE *.sunrpc *.* 0 0 49152 0 LISTEN *.* *.* 0 0 49152 0 IDLE localhost.5987 *.* 0 0 49152 0 LISTEN localhost.898 *.* 0 0 49152 0 LISTEN localhost.32771 *.* 0 0 49152 0 LISTEN localhost.5988 *.* 0 0 49152 0 LISTEN localhost.32772 *.* 0 0 49152 0 LISTEN *.ssh *.* 0 0 49152 0 LISTEN *.32785 *.* 0 0 49152 0 BOUND localhost.6788 *.* 0 0 49152 0 LISTEN localhost.6789 *.* 0 0 49152 0 LISTEN localhost.32782 *.* 0 0 49152 0 LISTEN localhost.smtp *.* 0 0 49152 0 LISTEN localhost.submission *.* 0 0 49152 0 LISTEN server-host-name.ssh pc-host-name.51269 64868 51 49640 0 ESTABLISHED TCP: IPv6 Local Address Remote Address Swind Send-Q Rwind Recv-Q State If --------------------------------- --------------------------------- ----- ------ ----- ------ ----------- ----- *.* *.* 0 0 49152 0 IDLE *.ssh *.* 0 0 49152 0 LISTEN 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 Active UNIX domain sockets Address Type Vnode Conn Local Addr Remote Addr ffffffff84e25ab8 stream-ord ffffffff8569c740 00000000 /var/run/.inetd.uds bash-3.00$ It looks to me like we have the following items UDP IPv4 Open ports sunrpc, 32771 Question 1: What is *.* Unbound? TCP IPv4 Open ports sunrpc, ssh 10 ports open only for localhost The open ssh connection from my PC Question 2: What is *.32785 *.* 0 0 49152 0 BOUND? Question 3: What is *.* *.* 0 0 49152 0 IDLE? (shows up twice) IPv6 Open port ssh Question 3: What is *.* *.* 0 0 49152 0 IDLE? Question 4: What is SCTP? Question 5: What is Active UNIX domain sockets

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• Outlook certificate error and separate send/receive error

  - by Richard

  I run a laptop with Vista 32bit and MS Office 2010. Outlook has two profiles, both configured as POP3/SMTP and neither go through an exchange server. Recently, one of the mail servers (hosted with easily) was getting full, so I changed the profile setting to delete from the server if mails are older than 60 days. Suddenly, I am now experiencing a couple of glitches. The first is that I get a certificate error when outlook tries it's first send/receive under the relevant profile - "The server you are connected to is using a security certificate that cannot be verified" This continues despite apparently successfully re-importing the certificate. The second glitch is that I get a "Sending reported error (0x8004010F): 'Outlook data file cannot be accessed'" error on send receive. Strangely, it seems to be trying to send/receive twice - once to 'mail@domain', which works, and the second to 'domain' which doesn't. I've tried deleting the profile and re-creating it, pointing to the original .pst file, but still get both errors. Does anybody know how I can resolve these errors? (As a by note, and not that important, more for curiosity, does anybody know why simply changing the delete from server setting against that profile would cause these issues?)

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