topic Re: Allocation limit on TPVV in HPE 3PAR StoreServ Storage

Allocation limit on TPVV

jruffer — Wed, 09 Mar 2016 12:15:06 GMT

Is it possible to put an allocation limit on a Thinly Provisioned Virtual Volume?

In settings I can see Allocation Limit <Disabled> but can't see a way to enable and set a limit.

Jeremy

Re: Allocation limit on TPVV

Mark Smithers — Thu, 10 Mar 2016 14:09:04 GMT

Jeremy,

I never seen the "enabled" box greyed out and I can't find anything at all to control it. Have you spoken to HP about this? Would be interesting to know why it's greyed out.

As an alternative, try using SSMC version 2.2 to see if that works. Don;t go for 2.3 as there are issues with Virtual Volumes in that version.

Cheers

Mark

Re: Allocation limit on TPVV

Sheldon Smith — Thu, 10 Mar 2016 15:57:30 GMT

While it is possible to set an allocation limit, it is not recommended as a Best Practice. Instead use Allocation Warning. Personally, I have yet to see a good Use Case for allocation limits.

Re: Allocation limit on TPVV

jruffer — Thu, 10 Mar 2016 17:33:25 GMT

Hi Mike,

It's not greyed out, it isn't there.

What is SSMC?

Jeremy

Re: Allocation limit on TPVV

jruffer — Thu, 10 Mar 2016 17:36:51 GMT

Hi Sheldon,

The event that prompted the question was that a bad query on a database used 1.5 TB more than the VV would normally use. This caused other systems to run out of space. This is still causing us problems nearly 3 weeks later.

If we could set it so that they got No space on device earlier then we would not have the problem.

Regards

Jeremy

Re: Allocation limit on TPVV

jruffer — Thu, 10 Mar 2016 17:45:26 GMT

I found it after I ticked Show advanced options.

Jeremy

Re: Allocation limit on TPVV

Sheldon Smith — Fri, 11 Mar 2016 01:24:27 GMT

SSMC is the StoreServ Management Console software. It replaces the older (InForm) Management Console. SSMC runs as a Windows service / Linux daemon and it's accessed via browser.

Re: Allocation limit on TPVV

Dennis Handly — Sat, 12 Mar 2016 23:34:40 GMT

>Is it possible to put an allocation limit on a TPVV?

By setting the max size smaller?

Re: Allocation limit on TPVV

jruffer — Mon, 14 Mar 2016 10:41:59 GMT

Yes, I would like the system to give the "no space on device" error earlier.

The size of the TPVV was intended to allow for at least 3 years growth, we don't want it getting that big yet.

Re: Allocation limit on TPVV

jruffer — Mon, 14 Mar 2016 17:18:59 GMT

There is a tick box for Allow stale snapshots. What are the implications of unticking this?

Jeremy

Re: Allocation limit on TPVV

Dennis Handly — Mon, 14 Mar 2016 17:41:36 GMT

>The size of the TPVV was intended to allow for at least 3 years growth, we don't want it getting that big yet.

You could always use growvv. But CLI supports "-usr-aw %" or "-usr-al %" for createvv and setvv.

Re: Allocation limit on TPVV

jruffer — Fri, 08 Apr 2016 14:36:12 GMT

What happens is that writes fail rather than getting a no space on device error. A bit more recovery is involved.

A better solution would be not to use thin provisioning.

Jeremy