ASIS and oversubscription

[dstrebel]

Currently we are using ASIS on for our VMware volumes. Is there a guide or best practice on how much space you should pad when oversubscribing.

[radek_kubka]

What do you mean by that - oversubscription due to thin provisioning? Are you using NFS or LUNs?

It may or may not have anything to do with de-dupe.

Ideally you shouldn't oversubscirbe on the aggregate level - if you do than close monitoring is highly recommended.

If volumes are not thinly provisioned then setting them to autogrow makes sense.

Regards,
Radek

[dstrebel]

Yes due to thin provisioning. We set are luns for thin provisioning. We are oversubscribing at the volume level.

[radek_kubka]

So definitely set volume auto-grow on & (probably) snapshot auto-delete on as well.

And monitor space usage closely

BTW - you may find Chris' post useful as well - although is mainly about fractional reserve, somewhere in the middle of the comments there is his howto guide about setting volumes to auto-grow, etc.

http://communities.netapp.com/groups/chris-kranz-hardware-pro/blog/2009/03/05/fractional-reservation--lun-overwrite

Regards,
Radek

[amiller_1]

If possible, I might seriously look at using NFS -- some thoughts here.

http://communities.netapp.com/message/8822#8822

Specifically with dedup, you'll see the space savings immediately -- no thin provisioning or any other steps required.