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woodunn
 Post subject: High IOPs during large deletions on RHEL cluster NFS storage
PostPosted: Sat Nov 02, 2013 8:02 pm 

Joined: Tue Dec 20, 2011 5:45 pm
Posts: 37
Location: Adelaide, South Australia
We have an 8 note V800 which is only serving storgage to a two node passive/active clustered RHEL NFS gateway. It has 12 x 12TB TPVV volumes presented to it. The NFS storage is mounted using the "unmap" switch to enable the reclamation of space when deletions occur.

When a large deletion is done (of 1TB) the IOPs go nuts and affects all other VLUNS sharing the same spindles.

Is anyone aware of a way to control the way in which large changes affect the controller. Could it be that the TPVV need to be fully prov?
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woodunn
 Post subject: Re: High IOPs during large deletions on RHEL cluster NFS sto
PostPosted: Sat Nov 02, 2013 8:06 pm 

Joined: Tue Dec 20, 2011 5:45 pm
Posts: 37
Location: Adelaide, South Australia
I have attached a system reporter capture if anyone is interested.


Attachments:
File comment: System Reporter evidence of impact of large delete
largedelete_production_02112013.csv [15.04 KiB]
Downloaded 1537 times
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Architect
 Post subject: Re: High IOPs during large deletions on RHEL cluster NFS sto
PostPosted: Tue Nov 05, 2013 3:43 pm 

Joined: Thu Dec 06, 2012 1:25 pm
Posts: 138
Interesting Issue. did you log a support case for this, with HP? might be wise to do so, to have them check out what is going on.

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Richard Siemers
 Post subject: Re: High IOPs during large deletions on RHEL cluster NFS sto
PostPosted: Sun Nov 10, 2013 12:15 am 
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Joined: Tue Aug 18, 2009 10:35 pm
Posts: 1328
Location: Dallas, Texas
Well this is good news, I did not know about the discard mount option.

Check out this document:
http://people.redhat.com/lczerner/disca ... 1_Brno.pdf

63% performance hit on GFS, 18% on ext4...

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Richard Siemers
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woodunn
 Post subject: Re: High IOPs during large deletions on RHEL cluster NFS sto
PostPosted: Mon Nov 11, 2013 7:55 am 

Joined: Tue Dec 20, 2011 5:45 pm
Posts: 37
Location: Adelaide, South Australia
We have ended up remounting with the unmap feature removed. This has settled the performance hit on the array but now we cannot reclaim space after a delete unless we manually run a cleanup accross the CPG!
HP are working with us on this as we have a TPVV licence that is useless if we have TPVV volumes acting as thickly provisioned.
HP are working on this and as per our RC issue on large volumes, a code update will be part of the Feb 14 release.
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