Discuss October 2009

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338 participants
324 discussions

Cant map Apache DAV network place to network drive
by Neil Aggarwal 12 Oct '09

12 Oct '09

Hello: I have set up a DAV file system on my apache server using these directives in ssl.conf: Alias /files /var/www/files <Directory /var/www/files> Dav On AuthType Basic AuthName "Filesystem access" AuthUserFile /var/www/files.passwd require valid-user Options Indexes </Directory> On my client machine (Windows XP SP3), I am able to add the https location as a network place. But, when I go to map the network place as a network drive, I can browse to the network place and see the folders, but the OK button is always greyed out. Is there something wrong in my Apache config or is Windows being obtuse? Does anyone know how to fix this? Thanks, Neil -- Neil Aggarwal, (281)846-8957, www.JAMMConsulting.com Will your e-commerce site go offline if you have a DB server failure, fiber cut, flood, fire, or other disaster? If so, ask about our geographically redundant database system.

9 13

RSync Issues
by ML 11 Oct '09

11 Oct '09

Hi All, Rsyncing to a USB drive. I am in single user mode. I am doing: rsync -avx --stats --progress --ignore-existing --exclude 'home/backup/ data' / /mnt/sdb2/ But I dont see if ignoring existing. A previous rsync stalled and now it seems to be copying them again rather than ignoring them. Does anyone have thoughts? -ML

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(no subject)
by ferwis＠volny.cz 10 Oct '09

10 Oct '09

1 0

GPT?
by ML 10 Oct '09

10 Oct '09

Hi All, I had a few 320gb sata drives that had OS X on them. Before that they were Windows for testing. I put them in an IBM eServer 335 and now trying to install CentOS 5.3 I get to the partition -> Create custom. I take sda and create a swap and a software raid partition. Same with sdb I then click Raid, mount at / and Raid1 (Mirroring) I try to proceed and I get: boot partition is on a disk using GPT partitioning scheme but this machine cannot boot using GPT. I have never seen this before. Advice? -Jason

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choppy audio playback
by ken 09 Oct '09

09 Oct '09

Oh, wise Centaurs, On the last install (Suse) I was running on this old notebook (Dell i600m) the audio worked fine. Specifically, Realplayer and onsite players (like you get at NPR and other sites) and youtube played just fine. But with this current install (CentOS 5.3, fully updated) all of those sources just mentioned play choppy. It's like an echo so severe that it's impossible to make out what's being said or played. Oddly, piping "festival" into "play" works fine as does using "play" on wav files. Realplay (Gold 11) plays mp3 files just fine too. Anybody else experiencing audio torture? lspci -vv says I have: .... 00:1f.5 Multimedia audio controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH 4-L/ICH4-M) AC'97 Audio Controller (rev 01) Subsystem: Dell Unknown device 011e Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Step ping- SERR- FastB2B- Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort - <MAbort- >SERR- <PERR- Latency: 0 Interrupt: pin B routed to IRQ 5 Region 0: I/O ports at b800 [size=256] Region 1: I/O ports at bc40 [size=64] Region 2: Memory at f4fff800 (32-bit, non-prefetchable) [size=512] Region 3: Memory at f4fff400 (32-bit, non-prefetchable) [size=256] Capabilities: [50] Power Management version 2 Flags: PMEClk- DSI- D1- D2- AuxCurrent=375mA PME(D0+,D1-,D2-,D3h ot+,D3cold+) Status: D0 PME-Enable- DSel=0 DScale=0 PME- .... -- War is a failure of the imagination. --William Blake

1 0

disk I/O problems and Solutions
by Alan McKay 09 Oct '09

09 Oct '09

Hey folks, CentOS / PostgreSQL shop over here. I'm hitting 3 of my favorite lists with this, so here's hoping that the BCC trick is the right way to do it :-) We've just discovered thanks to a new Munin plugin http://blogs.amd.co.at/robe/2008/12/graphing-linux-disk-io-statistics-with-… that our production DB is completely maxing out in I/O for about a 3 hour stretch from 6am til 9am This is "device utilization" as per the last graph at the above link. Load went down for a while but is now between 70% and 95% sustained. We've only had this plugin going for less than a day so I don't really have any more data going back further. But we've suspected a disk issue for some time - just have not been able to prove it. Our system IBM 3650 - quad 2Ghz e5405 Xeon 8K SAS RAID Controller 6 x 300G 15K/RPM SAS Drives /dev/sda - 2 drives configured as a RAID 1 for 300G for the OS /dev/sdb - 3 drives configured as RAID5 for 600G for the DB 1 drive as a global hot spare /dev/sdb is the one that is maxing out. We need to have a very serious look at fixing this situation. But we don't have the money to be experimenting with solutions that won't solve our problem. And our budget is fairly limited. Is there a public library somewhere of disk subsystems and their performance figures? Done with some semblance of a standard benchmark? One benchmark I am partial to is this one : http://wiki.postgresql.org/wiki/PgCon_2009/Greg_Smith_Hardware_Benchmarking… One thing I am thinking of in the immediate term is taking the RAID5 + hot spare and converting it to RAID10 with the same amount of storage. Will that perform much better? In general we are planning to move away from RAID5 toward RAID10. We also have on order an external IBM array (don't have the exact name on hand but model number was 3000) with 12 drive bays. We ordered it with just 4 x SATAII drives, and were going to put it on a different system as a RAID10. These are just 7200 RPM drives - the goal was cheaper storage because the SAS drives are about twice as much per drive, and it is only a 300G drive versus the 1T SATA2 drives. IIRC the SATA2 drives are about $200 each and the SAS 300G drives about $500 each. So I have 2 thoughts with this 12 disk array. 1 is to fill it up with 12 x cheap SATA2 drives and hope that even though the spin-rate is a lot slower, that the fact that it has more drives will make it perform better. But somehow I am doubtful about that. The other thought is to bite the bullet and fill it up with 300G SAS drives. any thoughts here? recommendations on what to do with a tight budget? It could be the answer is that I just have to go back to the bean counters and tell them we have no choice but to start spending some real money. But on what? And how do I prove that this is the only choice? -- “Don't eat anything you've ever seen advertised on TV” - Michael Pollan, author of "In Defense of Food"

10 14

steps to add a new physical disk to existing LVM setup in new centos box?
by Jerry Queirolo 09 Oct '09

09 Oct '09

Not a centos specific question here, but if anyone can save me from shooting myself in the foot would appreciate any pointers.... I have an older centos 4.7 box that I recently replaced with a newer one running centos 5.3. I'd like to add the hard disk from the older one to the newer one before I scrap it for good. I don't care about the data on it, would just like the extra drive on the newer one for my home lan usage. The disk layout on the older one is a 2 partition (/boot and /) with / being a logical volume. Laying out what I think I need to do looks like this : 1. yank old drive and cable up to newer system, expecting this 2nd drive to now be /dev/sdb on the new box 2. pvcreate /dev/sdb1 3. vgextend VolGroup00 /dev/sdb1 (VolGroup00 is the volume group name on both system, pretty much default installs in both cases) 3. lvextend -l+100% /dev/VolGroup00 4. resize2fs / The disk in the old system looks like : [root@cow ~]# fdisk -l /dev/hda Disk /dev/hda: 122.9 GB, 122942324736 bytes 255 heads, 63 sectors/track, 14946 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/hda1 * 1 13 104391 83 Linux /dev/hda2 14 14946 119949322+ 8e Linux LVM [root@cow ~]# fdisk -l -u /dev/hda Disk /dev/hda: 122.9 GB, 122942324736 bytes 255 heads, 63 sectors/track, 14946 cylinders, total 240121728 sectors Units = sectors of 1 * 512 = 512 bytes Device Boot Start End Blocks Id System /dev/hda1 * 63 208844 104391 83 Linux /dev/hda2 208845 240107489 119949322+ 8e Linux LVM [root@cow ~]# pvscan PV /dev/hda2 VG VolGroup00 lvm2 [114.38 GB / 32.00 MB free] Total: 1 [114.38 GB] / in use: 1 [114.38 GB] / in no VG: 0 [0 ] [root@cow ~]# vgscan Reading all physical volumes. This may take a while... Found volume group "VolGroup00" using metadata type lvm2 [root@cow ~]# lvscan ACTIVE '/dev/VolGroup00/LogVol00' [113.84 GB] inherit ACTIVE '/dev/VolGroup00/LogVol01' [512.00 MB] inherit I'm curious if my 1-4 seem sane, or if I'll need to cfdisk and nuke the existing partitions on the disk once in the newer system, or if pvcreate will do what I need. If there is a preferred method to my madness, and you can save me from shooting a hole in my foot, appeciate any comments. Thanks in Advance, Jerry Queirolo

2 2

Bare Metal vs virtualization
by Scott Ehrlich 09 Oct '09

09 Oct '09

Hello to all: I know this list is generally Linux-only, but I figured I'd try to gain wisdom from those with hard-core Windows needs, too. I was recently pricing out a high-end desktop system for a user who will doing a lot of CAD, Matlab, SolidWorks, and other apps that will utilize a lot of number crunching and video. The quote for the desktop (64-bit Vista is likely), which included 12 GB RAM, two 1 TB SATA hard drives, a high-end NVidia 3D video card, and two Intel quad-core 3.3 Ghz processors, was about $15k. An approval manager asked if the money could be better spent towards a cluster for others to use. This user's needs are for Windows-based apps. The open question, then, is can the results the user needs be derived from a high-end Windows cluster or virtual environment that is multi-user capable and runs Windows-based apps, or do they need bare metal for true results and performance? I awaiting an answer on this from the user. In the meantime, for those who may have been faced with this, too, what have you discovered/learned? Thanks. Scott

4 3

Web server in a sandbox?
by Anne Wilson 09 Oct '09

09 Oct '09

I'd like to understand better the sysadmin aspects of running a wiki. I don't have, and don't intend to at this stage, a web server, but I do have spare capacity on my LAN server box, where I'd like to install MediaWiki. I found this article: http://docs.fedoraproject.org/documentation-guide/en_US/sn-sandbox-setup.ht… Would it be straightforward to follow those instructions on a CentOS5 box? Anything I should be aware of? Remember that this is a whole new ballgame for me. Is it likely to meet my needs? Any recommended reading that takes it right from step1 - assuming no special knowledge? Anne -- New to KDE4? - get help from http://userbase.kde.org Just found a cool new feature? Add it to UserBase

12 25

DNS is confusing! (I really need some help understanding!)
by ML 09 Oct '09

09 Oct '09

OK, I am confused and DNS is the reason. So, Comcast, 13 public IP's bound to my modem. Each public IP has a DNS name from comcast (they assign it automatically) like: 173.13.167.209 --> 173-13-167-209-sfba.hfc.comcastbusiness.net I created a DNS entry at GoDaddy for 173.13.167.209 that is 'inhouse.theindiecompanyllc.com' When eth0 is alive, I see that it tells me my name is 173-13-167-209-sfba.hfc.comcastbusiness.net since I am using a comcast DNS Server. So if I setup my own internal caching name server for 173.13.167.209 then I have a third name or can I just use the GoDaddy DNS entry I gave it? Do I then set my systems to use my local name server for their information and not Comcast? How does that effect internet browsing where I dont have entries for google.com, etc in my local name server? Lastly, If I have two NICS (one is 173.13.167.209 and second private internal IP) For my local name server I would have two entries, one for public and one for the private card so I can do something like 'inhouse.local' and get intranet or ssh inhouse.local, etc correct? I see that Paul Heinlin put out a DNS tutorial here: http://www.madboa.com/geek/soho-bind/ Paul, I appreciate this! -ML

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Discuss October 2009