Glenn,
 
That's true; by default all new VM's created on an NFS volume would be thin provisioned. I'm not sure if that's the case for templates though (I thought they were created fat on purpose for performance reasons when deploying them).
 
Also, we migrated from FC and iSCSI LUNS (which is basically a file copy) so most of our VM's are fat anyway. From what I understand using SVMOTION also results in a fat filed VM, though that's not officially supported on NFS in ESX3.5.
 
So, in summary there are a few reasons why you might end up with non-thin provisioned VM's on NFS and may therefore hit this bug.
 
Darren
 

From: Glenn Walker [mailto:ggwalker@mindspring.com]
Sent: Tue 10/14/2008 03:23
To: Darren Sykes; Page, Jeremy; toasters@mathworks.com
Subject: RE: Snapvault slow on one specific volume?

I was under the impression that ESX over NFS used thin-provisioned VMDKs by default (that’s how it is in our environment, and all of the files are appearing as thin-provisioned).  Would this then be not the same bug?  Thin-provisioned VMDKs means that the portion of the VMDK not allocated to the guest would be treated as a sparse file, not a file filled with zeros.  (unless someone decided to perform a full format on the ‘disk’, perhaps?)

 

From: owner-toasters@mathworks.com [mailto:owner-toasters@mathworks.com] On Behalf Of Darren Sykes
Sent: Monday, October 13, 2008 3:51 PM
To: Page, Jeremy; toasters@mathworks.com
Subject: RE: Snapvault slow on one specific volume?

 

Jeremy/All,

 

Following on from our conversation offline:

 

It would seem you (and I) have been suffering from the bug described here: http://now.netapp.com/NOW/cgi-bin/bol?Type=Detail&Display=281669

 

We saw it on template volumes. I'm planning to disable ASIS on that volume to attempt to speed up access.

 

Obviously, that solution may be less than useful in your environment where it's live data volumes which benefit from ASIS.

 

Darren

 

 

 

 

From: owner-toasters@mathworks.com on behalf of Page, Jeremy
Sent: Mon 10/13/2008 13:14
To: toasters@mathworks.com
Subject: Snapvault slow on one specific volume?

I have an aggr with two volumes on it. One of them is a 3.5 TB CIFS/NFS share that is reasonably fast to snapvault and a 1 TB NFS share (ESX VMs) that is exceptionally slow.  As in it’s been doing it’s initial copy for over a week and still has not finished. NDMP backups of this volume are also quite slow, does anyone know why it would be so much slower then the other volume using the same spindles? The filer is not under extreme load, although occasionally it’s pretty busy. Here is a “normal” sysstat:

 

CPU   Total    Net kB/s    Disk kB/s    Tape kB/s Cache Cache  CP  CP Disk

       ops/s    in   out   read  write  read write   age   hit time ty util

 12%    1007  2970  8996  15769   9117     0     0     8   93%  49%  :  41%

 18%     920  2792  6510  11715   6924     0     0     8   99%  84%  T  39%

 15%    1276  3580 10469  15942   8041     0     0    10   92%  33%  T  36%

 13%    1487  3416 11347  15632   4907     0     0    11   89%  42%  :  43%

 17%    1417  3180  9890  14000   9444     0     0     9   98%  79%  T  41%

 13%     972  3704  9705  15427   9934     0     0     7   92%  46%  T  51%

 18%    1087  2947 11911  17717   4640     0     0     9   98%  33%  T  47%

 11%    1204  3358 11219  14090   5159     0     0     7   88% 100%  :  50%

 12%    1161  2808  9085  12640   5936     0     0     9   90%  33%  T  44%

 13%     981  4735 11919  16125   7097     0     0     9   92%  45%  :  43%

 15%    1158  5780 12480  17565   8266     0     0    10   92%  88%  T  41%

 

I’m just having difficulty trying to determine why two volumes on the same spindles would be  so different in the time it takes to do their initial transfer. Also, the VM’s do not seem slower then those hosted on other aggregates (this one is 3 RG of 11 disks each, Ontap 7.2.4 on a 3070A IBM rebranded).

 

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