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• Possible capacitor plague - need help identifying

  - by cornjuliox

  I've been having some PC power issues lately, and I think I've tracked it down to a bad power supply. Lately, when I'm on my PC it will often restart without warning, displaying "Hypertransport sync flood error occurred last boot." once POST finishes. I've googled the error, but can't come to a definitive conclusion as to what's causing it. I've seen posts suggesting that it might be a power supply issue, but nothing conclusive. Here's what I've done so far: -I haven't installed anything suspect within the last 3 months. -I do overclock just a tiny bit, so I tried raising the voltages a little. That didn't work so I brought both CPU multiplier and voltages all back to their default settings, but that didn't solve the problem either. The problem still occurs. -AV scanned the whole system, nothing suspect. -I suspected that it might be a bad power supply so I cracked that open and found the following: I think it might be cap plague, but I'm not sure. It looks more like glue TBH. Could someone help me figure out what might be wrong with this PC? EDIT: Sometimes, after these restarts, I noticed that the GPU fan doesn't spin up, and the single rear case fan that just happens to be connected to the same molex Y-cable as the GFX card doesn't spin up either. Anything to that? EDIT 2: I do use the system quite heavily, but I don't know how that will factor into this. I often play Diablo 3 and EVE Online at the same time, frequently alt-tabbing between the two. I also have Firefox open in the background, sometimes with several tabs, and if I feel like it, I'll mute the in-game sound and open foobar2000 for better music. Could it be that I'm just pushing this thing too hard? EDIT 3: I also noticed something odd. Right before I experience these restarts, my monitor would suffer from very faint lines of static moving across the screen. The monitor is still very much useable, but it is very annoying. Following the restart it disappears, and then would gradually re-appear over the next few days, and then restarts again. I find it to be very odd. System specs for good measure: Orion 600 W PSU AMD Athlon II X3 440 (overclocked to 3.14 ghZ, raised the CPU multiplier to x13 from x10) MSI G40-775 motherboard 1 GB inno3D GTX 550 ti 4 GB DDR3 RAM 500 GB Samsung SATA HD

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• Nvidia Optimus shows Nvidia card is always active in Windows 8

  - by Ty Underwood

  I have loaded the new Asus Nvidia driver for my Asus Ux32VD that I have installed Windows 8 on. It has an Nvidia 620m and Intel hd 4000 integrated graphics. The problem is that the Optimus activity icon in my system tray shows that the Nvidia card is always active, though it shows that it is not doing anything. I can force the system to prefer the Intel graphics, and after rebooting, the Nvidia card will shut off, but then all the programs will be overridden and use the Intel graphics. Is anyone else having problems with Optimus in Windows 8? My battery life is really suffering because I'm always idling my Nvidia card while also presumably running the Intel card. Any suggestions would be appreciated.

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• In what way does non-"full n-key rollover" hinder fast typists?

  - by Michael Kjörling

  Wikipedia claims (although the latter claim does not cite a source) that: High-end keyboards that provide full n-key rollover typically do so via a PS/2 interface as the USB mode most often used by operating systems has a maximum of only six keys plus modifiers that can be pressed at the same time.[4] This hinders fast typists, ... In what way would the system being able to recognize only six non-modifier keys at once hinder a fast typist? I consider myself a relatively fast typist and I usually press one key, plus modifiers, at once; I can't imagine any real-life situation in which the system only recognizing six non-modifier keys being pressed at once has been a limiting factor in my keyboard usage. (Multi-stroke keyboard shortcuts as used by high-end software like Visual Studio, Emacs and the like are a different matter.) Note that I am not really interested in answers centered around multiplayer computer games; I'm looking for answers that give reasons that would be relevant to typists, somehow supporting the statement made on Wikipedia.

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• weird postgresql log entries

  - by hyperboreean

  I am trying to figure out why I get some weird entries in my postgresql log after I do a restart: 2010-05-14 11:30:25 EEST LOG: database system was shut down at 2010-05-14 11:30:22 EEST 2010-05-14 11:30:25 EEST LOG: autovacuum launcher started 2010-05-14 11:30:25 EEST LOG: database system is ready to accept connections 2010-05-14 11:30:25 EEST LOG: incomplete startup packet 2010-05-14 11:30:40 EEST WARNING: there is already a transaction in progress 2010-05-14 11:30:40 EEST LOG: could not receive data from client: Connection reset by peer 2010-05-14 11:30:40 EEST LOG: unexpected EOF on client connection First, there's the 2010-05-14 11:30:25 EEST LOG: incomplete startup packet which bugs me. Anyone has any idea why this happens? And also, this one is very strange: 2010-05-14 11:30:40 EEST WARNING: there is already a transaction in progress ...

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• Taking ownership of trustedinstaller files?

  - by P a u l

  vista32-sp1: I am unable to delete some files on my system that were installed with 'special permissions' by 'trustedinstaller'. I find the usual help suggestion to use 'takeown' is not working, all I get is access denied. I refuse to believe there isn't some way to delete these files, or that microsoft has finally acheived their perfect security filesystem. This is NOT a case of a file being locked by a process. If this is all it was, I could solve this by myself. I know there are some recommended unlocking programs and they might do some sort of file system trick, but I would like to know what my possible direct actions might be. If a 3rd party program can 'unlock' a file, I want to know the mechanism. But like I said 'takeown' at the command line is not working for this.

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• Build and migrated to software raid (mdadm) on GPT disk, now can't assemble array

  - by John H

  mdadm, gpt issues, unrecognized partitions. Simplified question: How do I get mdadm to recognize GPT partitions? I have been attempting to convert/copy my Ubuntu 11.10 OS from a single drive to software raid 1. I have done similar in the past, but in this case, I was adding in a drive that has been configured for GPT and I tried to work with that without fully looking into the implications. Currently, I have a non-booting mdadm RAID 1 array of /dev/md127 (the OS assigned that and it keeps picking up). I am booting off of live USB keys, currently System Rescue CD from sysresccd. While gdisk and parted can see all the partitions, most of the OS utilities do not, including mdadm. My main goal is just to make the raid array accessible so I can get pull the data and start fresh (without using GPT). /dev/md127 /dev/sda /dev/sda1 <- GPT type partition /dev/sda1 <- exists within the GPT part, member of md127 /dev/sda2 <- exists within the GPT part, empty /dev/sdb /dev/sdb1 <- GPT type partition /dev/sdb1 <- exists within the GPT part, member of md127 History: POINT A: The original OS was install on sda (actually /dev/sda6). I used a the Ubuntu live usb to add sdb. I got warning from fdisk about GPT so I used gdisk to create a raid partition (sdb1) and mdadm to create a raid1 mirror with a missing drive. I had many issues getting this working (including being unable to get grub to install) but I eventually got it to boot using grub on sda and /dev/md127 off of sdb. So at point A, I had copied my OS from sda6 to md127 on sdb. I then booted into a rescue mode and attempted to get a bootloader onto sdb, which failed. I then discovered my mistake: I had installed the raid onto sdb instead of sdb1, essentially overwriting the sdb1 partition. POINT B: I now had two copies of my data- one on md127/sdb, and one on sda. I destroyed data on sda and created a new GPT table on sda. I then created sda1 for the raid array, and sda2 for a scratch partition. I added sda1 into the raid array and let it rebuild. md127 now covered /dev/sdb and /dev/sda1 as fully active and synced. POINT C: I rebooted onto linux rescue again and was still able to access the raid array. I then removed /dev/sdb from the array and created /dev/sdb1 for the raid. I added sdb1 to the array and let it sync. I was able to mount and access /dev/md127 without issues. Once it completed, both /dev/sda1 and /dev/sdb1 were GPT partitions and actively syncing. POINT D (current): I rebooted again to test if the array would boot and grub failed to load. I booted off of my live thumb drive and found that I can no longer assemble the raid array. mdadm doesn't see the required partitions. -- root@freshdesk /root % uname -a Linux freshdesk 3.0.24-std251-amd64 #2 SMP Sat Mar 17 12:08:55 UTC 2012 x86_64 AMD Athlon(tm) II X4 645 Processor AuthenticAMD GNU/Linux === /proc/partitions and parted look good: root@freshdesk /root % cat /proc/partitions major minor #blocks name 7 0 301788 loop0 8 0 976762584 sda 8 1 732579840 sda1 8 2 244181703 sda2 8 16 732574584 sdb 8 17 732573543 sdb1 8 32 7876607 sdc 8 33 7873349 sdc1 (parted) print all Model: ATA ST31000528AS (scsi) Disk /dev/sda: 1000GB Sector size (logical/physical): 512B/512B Partition Table: gpt Number Start End Size File system Name Flags 1 1049kB 750GB 750GB ext4 2 750GB 1000GB 250GB Linux/Windows data Model: ATA SAMSUNG HD753LJ (scsi) Disk /dev/sdb: 750GB Sector size (logical/physical): 512B/512B Partition Table: gpt Number Start End Size File system Name Flags 1 1049kB 750GB 750GB ext4 Linux RAID raid Model: SanDisk SanDisk Cruzer (scsi) Disk /dev/sdc: 8066MB Sector size (logical/physical): 512B/512B Partition Table: msdos Number Start End Size Type File system Flags 1 31.7kB 8062MB 8062MB primary fat32 boot, lba === # no sda2, and I double the sdb1 is the one shown in parted root@freshdesk /root % blkid /dev/loop0: TYPE="squashfs" /dev/sda1: UUID="75dd6c2d-f0a8-4302-9da4-792cc7d72355" TYPE="ext4" /dev/sdc1: LABEL="PENDRIVE" UUID="1102-3720" TYPE="vfat" /dev/sdb1: UUID="2dd89f15-65bb-ff88-e368-bf24bd0fce41" TYPE="linux_raid_member" root@freshdesk /root % mdadm -E /dev/sda1 mdadm: No md superblock detected on /dev/sda1. # this is probably a result of me attempting to force the array up, putting superblocks on the GPT partition root@freshdesk /root % mdadm -E /dev/sdb1 /dev/sdb1: Magic : a92b4efc Version : 0.90.00 UUID : 2dd89f15:65bbff88:e368bf24:bd0fce41 Creation Time : Fri Mar 30 19:25:30 2012 Raid Level : raid1 Used Dev Size : 732568320 (698.63 GiB 750.15 GB) Array Size : 732568320 (698.63 GiB 750.15 GB) Raid Devices : 2 Total Devices : 2 Preferred Minor : 127 Update Time : Sat Mar 31 12:39:38 2012 State : clean Active Devices : 1 Working Devices : 2 Failed Devices : 1 Spare Devices : 1 Checksum : a7d038b3 - correct Events : 20195 Number Major Minor RaidDevice State this 2 8 17 2 spare /dev/sdb1 0 0 8 1 0 active sync /dev/sda1 1 1 0 0 1 faulty removed 2 2 8 17 2 spare /dev/sdb1 === root@freshdesk /root % mdadm -A /dev/md127 /dev/sda1 /dev/sdb1 mdadm: no recogniseable superblock on /dev/sda1 mdadm: /dev/sda1 has no superblock - assembly aborted root@freshdesk /root % mdadm -A /dev/md127 /dev/sdb1 mdadm: cannot open device /dev/sdb1: Device or resource busy mdadm: /dev/sdb1 has no superblock - assembly aborted

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• Where lies the soul of a computer?

  - by Christian

  When you take the system drive and put it in a new box, do you rename it or do you keep the name? And when you put a fresh drive in the old box, do you give it a new name? What is with upgrading? How many of the components do you have to change until a computer loses its identity? So a CPU is often described as the heart or the brain of a computer but where lies its soul? What determines its identity? The data on the system drive? The majority of its components? This might sound like a not-so-serious question and it probably is but whom of you didn't already face this problem?

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• Rail's FileStore with Linux Disk Caching or RAMdisk?

  - by Yo Ludke

  I have a Ruby on Rails application that stores it's catched files on the filesystem (Rails file-system cache). I was thinking about changing to memcached Store, but a short test shows it isn't a big difference in speed. From linuxatemyram.com I learned a bit about file caching. On the current machine there would be around 40..45GB RAM left which isn't needed for the application and which can be used to linux-disk-cache this rails file cache store. The disk is a RAID10 system with almost 120MB disk perfomance. How can I tell Linux to use free RAM more deliberately and not to be shy about using it? Do think it's necessary to adjust a sysyctl/.. value here, or would I have performance advantages to put the File Store root diretory on a ramdisk? (Loosing the cache during a reboot wouldn't be a problem)

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• nginx configuration for URL URI paths

  - by hachiari

  I want to switch my webserver from apache to nginx however I have difficulties in converting my current htaccess to nginx configuration the conditions that I need: I want everything to be like apache, it can read file such as js, css, jpg, png ,etc I am currently using CodeIgniter PHP frameword, it uses the URI system thingy... So my htaccess configuration for CodeIgniter URI is: RewriteEngine On RewriteBase / RewriteCond %{REQUEST_URI} ^system.* RewriteRule ^(.*)$ /index.php/$1 [L] RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule ^(.*)$ index.php/$1 [L] RewriteCond %{HTTP_HOST} ^www.domain.tld [NC] RewriteRule ^(.*)$ hxtp://domain.tld/$1 [L,R=301] I am also using minify to compress my css and js files, so the way I call my css and js is like: hxtp://domain.tld/?=css hxtp://domain.tld/?=js I tried some configurations from the net, but I could only solve problem no 2 Thank You

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• Extract attachments from Mbox throw MIME

  - by Simeon

  I am a littlebit frustrated, im working on a project with the aim to build a system witch print automatically e-mail attachments of incoming mails ("E-Mail to Print"-system). I already set up a e-mail server (exim4) which receive perfectly e-mail and stores them to a mbox in /var/mail/ - now I want to extract the attachments out of the mbox file throw MIME to the original .PDF, .DOC, .JPG, .GIF, ... and save them in a directory, from where they get print. After the e-mail attachments got extracted they should be deleted, so they don't get extracted again. But how can I get this to work? I am not a coder, so I looked for existing scripts and programs but found nothing to work with. Could anyone give me little help - I would be very thankful! Thanks, Simeon

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• Weird Windows 2003 MSDTC and SQL 2005 issue

  - by seagull surfer

  scenario: Windows 2003 sp2 x64 enterprise edition. SQL 2005 sp2 cu9 x64 Enterprise edition After restarting the resource groups on two node active-active cluster, 3 SQL 2005 instances start up fine. The 4th one starts up but starts throwing the following error. "Enlist operation failed: 0x8004d00e(XACT E NOTRANSACTION). SQL Server could not register with Microsoft Distributed Transaction Coordinator (MS DTC) as a resource manager for this transaction. The transaction may have been stopped by the client or the resource manager." MSDTC is fine since the other 3 function normally. The only way to "fix" it is to take the 4th instance offline and bring it online again. Is there any way to fix this enlistment without restarting?

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• Access is denied while moving a file from different volumes

  - by logeeks

  i have a portable 500GB HDD plugged into my dell xps system. The system have windows 7 professional edition. the problem is that when i try to open a file(visual studio .sln file) it is saying that access is denied. I cannot copy this file to a different location(within my local HDD) it is saying that i need permission for the task to complete. I've checked and confirmed the following things 1) I've logged into an admin account before attempting these operations 2) My admin account have 'Full Control' 3) I've full control over the portable HDD 4) I changed the 'UAC' settings to 'Never notify' Please help.

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• cloud computing ? Eucalyptus

  - by neolix

  Hi Greeting!! I want to setup small cloud computing using our old 2 core server system? we are new to cloud system we have google for the same. We are looking host VM's on top any one has done pls share me doc or how to ? we have 50 plus server which we are not using. 2 core each 4GB RAM, 1TB HDD centos is my base os we looking host windows. Right now we can use this server only paravirtualization ignore my english Thanks

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• ruby on rails gitorious setup on ubuntu

  - by dogmatic69

  Ive been trying to install gitorious for a while now which required ruby and rails etc. Ive finally got rails pages serving but cant finish the installation of gitorious because the gem version is too new. the error logs say please run 'rake ultrasphinx:configure' and that gives rake ultrasphinx:configure (in /var/www/apps/gitorious) rake aborted! uninitialized constant ActiveSupport::Dependencies::Mutex /var/www/apps/gitorious/Rakefile:10:in `require' (See full trace by running task with --trace) From searching google this is beacuse of the wrong gem verison. Cant find a way to down grade it. apparently sudo gem update --system 1.4.2 should do the trick but ubuntu 10.10 does not like this. ERROR: While executing gem ... (RuntimeError) gem update --system is disabled on Debian, because it will overwrite the content of the rubygems Debian package, and might break your Debian system in subtle ways. The Debian-supported way to update rubygems is through apt-get, using Debian official repositories. If you really know what you are doing, you can still update rubygems by setting the REALLY_GEM_UPDATE_SYSTEM environment variable, but please remember that this is completely unsupported by Debian. So i added export REALLY_GEM_UPDATE_SYSTEM=1 to .bashrc and reloaded it with . ~/.bashrc and still the same. ive tried various forms of setting this environmental variable with no luck. Ive also been told on #gitorious irc channel to add the file config/initializers/rubygems.rb with the line require "thread" to it. This has done nothing. EDIT: Just found another way which was rvm install rubygems 1.4.2 and it gave: Removing old Rubygems files... Installing rubygems dedicated to ruby-1.8.7-p334... Retrieving rubygems-1.4.2 % Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 100 288k 100 288k 0 0 282k 0 0:00:01 0:00:01 --:--:-- 414k Extracting rubygems-1.4.2 ... Installing rubygems for /home/ubuntu/.rvm/rubies/ruby-1.8.7-p334/bin/ruby ERROR: Error running 'GEM_PATH="/home/ubuntu/.rvm/gems/ruby-1.8.7-p334:/home/ubuntu/.rvm/gems/ruby-1.8.7-p334@global:/home/ubuntu/.rvm/gems/ruby-1.8.7-p334@global" GEM_HOME="/home/ubuntu/.rvm/gems/ruby-1.8.7-p334" "/home/ubuntu/.rvm/rubies/ruby-1.8.7-p334/bin/ruby" "/home/ubuntu/.rvm/src/rubygems-1.4.2/setup.rb"', please read /home/ubuntu/.rvm/log/ruby-1.8.7-p334/rubygems.install.log WARN: Installation of rubygems did not complete successfully. TL;DR please tell me how to downgrade rubygems on ubuntu 10.10 or upgrade gitorious to work with 1.6.2 gems

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• Ubuntu: disable udev's persistent-net-generator.rules

  - by Luke404

  I'm using Ubuntu 12.04 LTS server edition and I am modifying /etc/udev/rules.d/70-persistent-net.rules to define my own mappings of ethernet interfaces to MAC addresses; that file is initially generated by rules in /lib/udev/rules.d/75-persistent-net-generator.rules at system installation time (or at the first boot, I actually don't know and it doesn't matter here). How can I be sure that my edited version will never ever be overwritten by anything? Removing the persistent-net-generator, as suggested on some websites, is not the Right Thing™ to do as told by comments in the file itself: it will be overwritten by any update of the udev package. I'm looking for a more formally correct way to disable it. Is it enough to just make sure that /etc/udev/rules.d/70-persistent-net.rules does exist? Maybe there are other events that could trigger its regeneration? (eg. adding or removing ethernet interfaces to the system?)

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• Best RAID setup for multimedia fileserver?

  - by Mr. Schwabe

  I'm building a fileserver for my small office. We do film and multimedia design. Only 3 clients connected. The server is primarily for local access to graphic assets and video files. I'm looking for advice on hardware and software required. Particularly for the RAID. I have the following objectives: A) merged capacity I'd like all other systems to access the data as a single mapped network drive that has an initial capacity of 10 TB. So perhaps 5x 2TB drives (plus mirror drives for redundancy). B) easy way to increase capacity Thinking long term, I'd like to 'easily' add more drives to the array for a potential two or three fold increase in capacity. So theoretically it could get upto a 30 TB raid array consisting of maybe 15x 2 TB drives of capacity (plus mirror drives for redundancy). C) maximum fault tolerance I want at least 1 mirror drive per capacity drive (in laymen's terms). So if I start with 10 TB / 5x 2TB of capacity, I suppose I would need another another 5x 2TB drives to be mirrors. So 10 drives total. But I'd also like potential for even more redundancy; with upto 2 additional mirrors per 'capacity drive' (and to be able to add them to the array anytime with ease). D) easy way to monitor drive health I'd like an intuitive interface for managing the raid and monitoring drive health The other systems accessing this network drive will be running Windows, but also the odd Ubuntu and MacOS system as well. Are these objectives attainable? What type of RAID setup do you recommend? What hardware will be required? Also what OS do you think this system should be running? Does it really matter? I'm no network admin - just a long time Windoze user, without much Linux experience. That said, I'm not opposed to a Linux solution if it's easy enough and more practical than a Windows OS for this server. Or maybe something such as Openfiler. Budget should hit the sweet spot for value and performance (hence my preference to use 2TB drives). The biggest focus is storage; aside from that the system just needs to keep the drives running optimally with perhaps 2 or 3 clients accessing / writing files at any given time. The hardware quote would start with something like 10x 2TB WD Caviar Blacks; about $1900 for the storage + $x for remaining parts. http://ncix.com/products/index.php?sku=42775&vpn=WD2001FASS&manufacture=Western%20Digital%20WD Your advice is appreciated, thanks!

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• How to change the HUDSON owner on ubuntu:

  - by Anil

  I am working with tomcat6 and HUDSON, when I run the hudson job it is running as tomcat6 user, what I want to know is there any way to change the HUDSON user as my system login user instead of tomcat6 so that I can run hudson job as my system user. I just want to know whether it is possible or not and why and how? I tired editing /etc/init.d/tomcat6 and changed tomcat6 user and grop as my login id, and the restarted the tomcat. Still the hudson jobs are running as tomcat6 user.Am i did the righ thing, if so why it is not working. Thanks in advance

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• connect two computers together via a rs232 serial port

  - by Richard

  Wondering if anyone knows of a solution to connect with telnet/ssh through a rs232 serial port Edit: I am looking for a way to connect to computers together via a serial port. I want to be able to view the file system of a computer through a serial port.. Is this possible? Edit: So I have successfully connected two computers together using r232 serial ports with a null modem. The instructions I have used are located here Now how do I get to the file system of the host computer?? Any ideas?

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• flashcache with mdadm and LVM

  - by Backtogeek

  I am having trouble setting up flashcache on a system with LVM and mdadm, I suspect I am either just missing an obvious step or getting some mapping wrong and hoped someone could point me in the right direction? system info: CentOS 6.4 64 bit mdadm config md0 : active raid1 sdd3[2] sde3[3] sdf3[4] sdg3[5] sdh3[1] sda3[0] 204736 blocks super 1.0 [6/6] [UUUUUU] md2 : active raid6 sdd5[2] sde5[3] sdf5[4] sdg5[5] sdh5[1] sda5[0] 3794905088 blocks super 1.1 level 6, 512k chunk, algorithm 2 [6/6] [UUUUUU] md3 : active raid0 sdc1[1] sdb1[0] 250065920 blocks super 1.1 512k chunks md1 : active raid10 sdh1[1] sda1[0] sdd1[2] sdf1[4] sdg1[5] sde1[3] 76749312 blocks super 1.1 512K chunks 2 near-copies [6/6] [UUUUUU] pcsvan PV /dev/mapper/ssdcache VG Xenvol lvm2 [3.53 TiB / 3.53 TiB free] Total: 1 [3.53 TiB] / in use: 1 [3.53 TiB] / in no VG: 0 [0 ] flashcache create command used: flashcache_create -p back ssdcache /dev/md3 /dev/md2 pvdisplay --- Physical volume --- PV Name /dev/mapper/ssdcache VG Name Xenvol PV Size 3.53 TiB / not usable 106.00 MiB Allocatable yes PE Size 128.00 MiB Total PE 28952 Free PE 28912 Allocated PE 40 PV UUID w0ENVR-EjvO-gAZ8-TQA1-5wYu-ISOk-pJv7LV vgdisplay --- Volume group --- VG Name Xenvol System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 2 VG Access read/write VG Status resizable MAX LV 0 Cur LV 1 Open LV 1 Max PV 0 Cur PV 1 Act PV 1 VG Size 3.53 TiB PE Size 128.00 MiB Total PE 28952 Alloc PE / Size 40 / 5.00 GiB Free PE / Size 28912 / 3.53 TiB VG UUID 7vfKWh-ENPb-P8dV-jVlb-kP0o-1dDd-N8zzYj So that is where I am at, I thought that was the job done however when creating a logical volume called test and mounting it is /mnt/test the sequential write is pathetic, 60 ish MB/s /dev/md3 has 2 x SSD's in Raid0 which alone is performing at around 800 MB/s sequential write and I am trying to cache /dev/md2 which is 6 x 1TB drives in raid6 I have read a number of pages through the day and some of them here, it is obvious from the results that the cache is not functioning but I am unsure why. I have added the filter line in the lvm.conf filter = [ "r|/dev/sdb|", "r|/dev/sdc|", "r|/dev/md3|" ] It is probably something silly but the cache is clearly performing no writes so I suspect I am not mapping it or have not mounted the cache correctly. dmsetup status ssdcache: 0 7589810176 flashcache stats: reads(142), writes(0) read hits(133), read hit percent(93) write hits(0) write hit percent(0) dirty write hits(0) dirty write hit percent(0) replacement(0), write replacement(0) write invalidates(0), read invalidates(0) pending enqueues(0), pending inval(0) metadata dirties(0), metadata cleans(0) metadata batch(0) metadata ssd writes(0) cleanings(0) fallow cleanings(0) no room(0) front merge(0) back merge(0) force_clean_block(0) disk reads(9), disk writes(0) ssd reads(133) ssd writes(9) uncached reads(0), uncached writes(0), uncached IO requeue(0) disk read errors(0), disk write errors(0) ssd read errors(0) ssd write errors(0) uncached sequential reads(0), uncached sequential writes(0) pid_adds(0), pid_dels(0), pid_drops(0) pid_expiry(0) lru hot blocks(31136000), lru warm blocks(31136000) lru promotions(0), lru demotions(0) Xenvol-test: 0 10485760 linear I have included as much info as I can think of, look forward to any replies.

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• Reasonable Location to Install Web Service on Server

  - by Mr. Disappointment

  Firstly, I'm a software developer and not qualified as any kind of system or server expert so I'm looking for advice in order to help me prevent faults on our server. I've written a modular system to carry out certain tasks for us autonomously to prevent us from writing the same old code over and over again. This consists of a Windows Service (.NET), a Web Service (WCF), a shared Class Library, and a Database which will run on a Windows Server 2003. The problem comes, for me, in deployment. Specifically the web service - naturally the local service (and required shared library) are persisted (by default and convention) in the Program Files folder, but storing the web service here just seems absurd to me (even though we'd lock it down to appropriate use only). Should the files be stored some place else all together? Or split them up and store the web service elsewhere?

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• Server restart commando?

  - by badadmin

  How can i restart the Server automaticcaly on this Operating System( http://bit.ly/dq1TQP ) Thanks for your answers!

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• Which is generally considered faster or best practice: symlinks or Apache aliases?

  - by Christopher W. Allen-Poole

  I'm curious as to what most people's views are on this subject. Personally, I will almost always prefer symlinks unless I have no other option -- I find that it is far more obvious when someone is navigating the file system, but, on the other hand aliasing is more platform independent. Windows XP, for example, doesn't have anything remotely comparable to symlinks (NTFS junctions are not interpreted correctly by at least some environments), which means that anything which relies on symlinks in a *nix based system cannot be transferred. (I know that Windows 64x OS's have symlinks, but I've not seen if they can be read correctly by the environments previously mentioned) In addition to this, I was also wondering which is considered faster. Is this even possible to know? Do you have a conjecture? I would imagine that since symlinks are generally more low-level than Apache it would make sense that they would be referenced faster, but, on the other hand, I would guess that Apache is required to do a lookup in either case so it would be disk read dependent.

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• How to protect an OS X Server from an anautorized physical connection?

  - by GJ

  Hi I have an OS X 10.6 server, which I administer via SSH and VNC (via SSH tunnel). I can't leave it at the login window since then VNC connections are refused. Therefore I currently leave it logged with my user account. Since it doesn't have a monitor attached, it doesn't go into screen saver mode, which means it doesn't require a password to retake control. This means it is very easy for anyone connecting a keyboard/mouse and monitor to take control of the system. The screen saver password protection, which I can't get to activate, unlike the system's login window, is perfectly compatible with VNC connections. How could I prevent such direct access to the server without connecting a monitor and without blocking my ability to connect with VNC? Thanks!

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• Why do my Application Compatibility Toolkit Data Collectors fail to write to my ACT Log Share?

  - by Jay Michaud

  I am trying to get the Microsoft Application Compatibility Toolkit 5.6 (version 5.6.7320.0) to work, but I cannot get the Data Collectors to write to the ACT Log Share. The configuration is as follows. Machine: ACT-Server Domain: mydomain.example.com OS: Windows 7 Enterprise 64-bit Edition Windows Firewall configuration: File and Printer Sharing (SMB-In) is enabled for Public, Domain, and Private networks ACT Log Share: ACT Share permissions*: Group/user names Allow permissions --------------------------------------- Everyone Full Control Administrator Full Control Domain Admins Full Control Administrators Full Control ANONYMOUS LOGON Full Control Folder permissions*: Group/user name Allow permissions Apply to ------------------------------------------------- ANONYMOUS LOGON Read, write & execute This folder, subfolders, and files Domain Admins Full control This folder, subfolders, and files Everyone Read, write & execute This folder, subfolders, and files Administrators Full control This folder, subfolders, and files CREATOR OWNER Full control Subfolders and files SYSTEM Full control This folder, subfolders, and files INTERACTIVE Traverse folder / This folder, subfolders, and files execute file, List folder / read data, Read attributes, Read extended attributes, Create files / write data, Create folders / append data, Write attributes, Write extended attributes, Delete subfolders and files, Delete, Read permissions SERVICE (same as INTERACTIVE) BATCH (same as INTERACTIVE) *I am fully aware that these permissions are excessive, but that is beside the point of this question. Some of the clients running the Data Collector are domain members, but some are not. I am working under the assumption that this is a Windows file sharing permission issue or a network access policy issue, but of course, I could be wrong. It is my understanding that the Data Collector runs in the security context of the SYSTEM account, which for domain members appears on the network as MYDOMAIN\machineaccount. It is also my understanding from reading numerous pieces of documentation that setting the ANONYMOUS LOGON permissions as I have above should allow these computer accounts and non-domain-joined computers to access the share. To test connectivity, I set up the Windows XP Mode virtual machine (VM) on ACT-Server. In the VM, I opened a command prompt running as SYSTEM (using the old "at" command trick). I used this command prompt to run explorer.exe. In this Windows Explorer instance, I typed \ACT-Server\ACT into the address bar, and then I was prompted for logon credentials. The goal, though, was not to be prompted. I also used the "net use /delete" command in the command prompt window to delete connections to the ACT-Server\IPC$ share each time my connection attempt failed. I have made sure that the appropriate exceptions are Since ACT-Server is a domain member, the "Network access: Sharing and security model for local accounts" security policy is set to "Classic - local users authenticate as themselves". In spite of this, I still tried enabling the Guest account and adding permissions for it on the share to no effect. What am I missing here? How do I allow anonymous logons to a shared folder as a step toward getting my ACT Data Collectors to deposit their data correctly? Am I even on the right track, or is the issue elsewhere?

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• OS X Snow Leopard, change file permissions on copy

  - by Francesco K

  I work with OS X, Snow Leopard and need to allow users to make copies of files (templates) located in a read-only repository for subsequent editing. The repository is located on a separate physical drive mounted to the OS X boot volume. As this is a shared computer in a school environment, all users access the machine via a single login ("user_local"). Whether using POSIX permissions or ACLs, the use case requires the file permissions to change from "read" to "read write" as they get copied to the "user_local" home directory. Googling around has not yielded anything that would indicate that this is possible via the Snow Leopard permission system. Question 1: Is this in fact possible via the permission system? If so, how? Question 2: If not possible, how would one go about solving this problem? I imagine this to be a fairly common use case so there must be a workable solution for it out there. Thanks.

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