bug-cvs
[Top][All Lists]
Advanced

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

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



address@hidden 
09/26/2008 03:01 AM


To
"Bill V Vickery" <address@hidden>
cc
address@hidden, address@hidden
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" <address@hidden> 
Sent by: address@hidden 
26/09/2008 05:15 


To
address@hidden 
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
*IMPORTANT NOTICE: This communication, including any attachment, contains 
information that may be confidential or privileged, and is intended solely 
for the entity or individual to whom it is addressed.  If you are not the 
intended recipient, you should delete this message and are hereby notified 
that any disclosure, copying, or distribution of this message is strictly 
prohibited.  Nothing in this email, including any attachment, is intended 
to be a legally binding signature.
*
_______________________________________________
Bug-cvs mailing list
address@hidden
http://lists.nongnu.org/mailman/listinfo/bug-cvs



------------------------------------------------------------------------------------------------------------
Get the best from British Airways at ba.com
http://www.ba.com
--
This message is private and confidential and may also be legally 
privileged.  If you have received this message in error, please email it 
back to the sender and immediately permanently delete it from your 
computer system.  Please do not read, print, re-transmit, store or act in 
reliance on it or any attachments.

British Airways may monitor email traffic data and also the content of 
emails, where permitted by law, for the purposes of security and staff 
training and in order to prevent or detect unauthorised use of the British 
Airways email system.

Virus checking of emails (including attachments) is the responsibility of 
the recipient.

British Airways Plc is a public limited company registered in England and 
Wales.  Registered number: 1777777.  Registered office: Waterside, PO Box 
365, Harmondsworth, West Drayton, Middlesex, England, UB7 0GB.

Additional terms and conditions are available on our website: www.ba.com


*IMPORTANT NOTICE: This communication, including any attachment, contains 
information that may be confidential or privileged, and is intended solely for 
the entity or individual to whom it is addressed.  If you are not the intended 
recipient, you should delete this message and are hereby notified that any 
disclosure, copying, or distribution of this message is strictly prohibited.  
Nothing in this email, including any attachment, is intended to be a legally 
binding signature.
*


reply via email to

[Prev in Thread] Current Thread [Next in Thread]