Jeremy,
 
I'd agree with IBM's analysis (and it's not often I say that).
 
We had performance issues on a filer with dedup enabled (and not always on the dedup volumes) that seem to have been fixed by upgrading to 7.2.5.1 which is now the Netapp recommended minimum if you're using dedup.
 
I'm told 7.2.6.1 has been released which will fix the sequential read bug too.
 
Darren.
 
 
 
 
 

From: owner-toasters@mathworks.com [mailto:owner-toasters@mathworks.com] On Behalf Of Page, Jeremy
Sent: 21 November 2008 15:33
To: toasters@mathworks.com
Subject: Very slow large file operations

I need help, I cannot figure out how to troubleshoot this problem further.

We have a rebranded 3070A with ~200 VMs running on it. Maybe 30 on a batch of FC disks and the rest on 2 aggrs of 33 SATA drives each. None of the VMs are disk IO intensive. When I try and copy a VM to a new volume I get EXTREMELY slow speeds, something on the order of 3 gig an hour. I am also seeing incredibly slow Snapvault transfers and initializations. I think that in part we are hitting the sequential read bug, but this occurs even on volumes that do not have SIS enabled. For instance I have a snapvault job running that’s been going for 4 days (!) and only xfered 260 gig. And it’s an update so should always be hitting data (and thus not having the bug).

Statit shows the drives all under 15% utilization. It’s over dual 10gigE connections with the preferred adapter set  (there are also 2 1 gig VIFs on this box for user and admin access).


I’m at a loss. IBM says we need to upgrade (we are at 7.2.4) but I am concerned that it’s not going to fix our problem and downtime windows are difficult to get so I want to make sure it’s resolved with as little interruption as possible. Any suggestions on troubleshooting?



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