HPE Storage Users Group

A Storage Administrator Community




Post new topic Reply to topic  [ 2 posts ] 
Author Message
 Post subject: Impact of running a compactcpg -dr on general performances
PostPosted: Wed Nov 21, 2012 9:36 am 

Joined: Mon Mar 19, 2012 9:17 am
Posts: 7
Hi friends,
Following the recommandation of HP personnel, I am about to run a compactcpg -dr on a particular CPG on which I hope to reclame free space.
I am wondering if any of you could comment on the performance impact of running such command in a prod environnment?

Of course I want to run it off hours but still, how bad is it?

-F-200, 16 x 600GB 15K RPM, RAID5 3+1

Regards


Top
 Profile  
Reply with quote  
 Post subject: Re: Impact of running a compactcpg -dr on general performanc
PostPosted: Thu Nov 22, 2012 7:19 pm 
Site Admin
User avatar

Joined: Tue Aug 18, 2009 10:35 pm
Posts: 1328
Location: Dallas, Texas
With 16x 600 gb drives... you have about 2880 iops to "play with" (180 per drive). Do you have "System Reporter" collecting your stats? If so, pull a Physical Disk performance report for a week span, and see how many iops you average for the entire system, and when your peaks/valleys are, and how close you get to your glass ceiling of 2880 iops. Reviewing the same report after the compact is done will help illustrate the impact it had on your environment, good information to keep around for next time, perhaps you will be able to run it during the day without hesitation.

On average, our highest work loads are at night during backups and batch processing, so we have the highest surplus of unused iops during the day. We run all our compacts as well as "D.O." moves during the day without issue, or noticeable impact.

As for compacting the CPG, I use the GUI, right click the CPG and click compact. It shows a pre-plan of what it will do before you execute it, and gives you the check box option to just free up any already empty LDs and not move any data around to free up additional LDs, I generally let it do a full run and compact the whole cpg.

_________________
Richard Siemers
The views and opinions expressed are my own and do not necessarily reflect those of my employer.


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 2 posts ] 


Who is online

Users browsing this forum: Google [Bot] and 50 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group | DVGFX2 by: Matt