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Re: Disk performance issue - CVS on AIX
From: |
Bill V Vickery |
Subject: |
Re: Disk performance issue - CVS on AIX |
Date: |
Fri, 26 Sep 2008 08:03:44 -0600 |
Very helpful advice sir. Further investigation yesterday afternoon
revealed that the main respository is set in a subdir off /usr, with /tmp
getting heavy usage as you suggest as a temporary storage area. Bottom
line....both are still on a pair of mirrored SCSI drives. It isn't just
ssh that is slow...it is all commands. For example, on the machine most
recently impacted it took 45 minutes just for a shutdown command to
complete. We'll look at moving the repository and the temporary storage
area out to more appropriate disk.
Kindest Regards,
Bill Vickery
RITS/UNIX Team lead
Office: (801) 333-5818
To provide feedback regarding RITS service, click here:
https://www.surveymonkey.com/s.aspx?sm=sZVET5w4IdkhFwVArVPO4g_3d_3d
iain.mees@ba.com
09/26/2008 03:01 AM
To
"Bill V Vickery" <wvvicke@regence.com>
cc
bug-cvs@nongnu.org, bug-cvs-bounces+iain.mees=ba.com@nongnu.org
Subject
Re: Disk performance issue - CVS on AIX
Bill,
We run a massive CVS repository here at British Airways on AIX5.3. I have
customised it significantly and it is running in a chroot jail rather than
native for security reasons.
Running from /tmp is not something I have ever heard of, or would
recommend (/tmp is for temporary files, not applications). CVS is not
really CPU bound, but can be rather i/o bound when it comes to checking a
number of items in/out. It also tends to use /tmp frequently as a
temporary storage area. As your repository is also in /tmp I would be
inclined to say that your i/o is out performing your disk capability.
If I remember correctly, you can change the cvs temp area (during compile
I think). but your most sensible thing would be to move your repository to
a proper filesystem, preferably on a different physical disk.
With regard to SSH being slow... If you are running OpenSSH, then try
making it running it as a daemon rather than via inetd. That way it
doesn't need to start for every connection as its already in storage.
Hope this helps
Iain
"Bill V Vickery" <wvvicke@regence.com>
Sent by: bug-cvs-bounces+iain.mees=ba.com@nongnu.org
26/09/2008 05:15
To
bug-cvs@nongnu.org
cc
Subject
Disk performance issue - CVS on AIX
Anyone aware of a disk performance issue with CVS in AIX 5.2, where
repository is located in /tmp and generating sufficient I/O load that it
brings rootvg disks to 100%, with essentially zero throughput. System
becomes unresponsive taking several minutes just to open a new ssh
session. Any comments/advice would be appreciated.
Kindest Regards,
Bill Vickery
RITS/UNIX Team lead
Office: (801) 333-5818
To provide feedback regarding RITS service, click here:
https://www.surveymonkey.com/s.aspx?sm=sZVET5w4IdkhFwVArVPO4g_3d_3d
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