topic Re: EVA4000 and leveling in Disk Enclosures

EVA4000 and leveling

inex — Thu, 17 Feb 2011 15:56:49 GMT

HI,
We have an EVA with a diskgroup consisting of 1TB fata drives. We expanded the disk groups with more drives and the leveling took ages... Are there any articles describing how to calculate how long time leveling takes depending on type and number of disk drives etc?

-inex

Re: EVA4000 and leveling

Sivaramakrishna_1 — Thu, 17 Feb 2011 16:48:39 GMT

Hi,

There is no specific guide for levelling time. Its fully depend on the utilization of the Disks on that DG and how much data to be levelled.

Yes with 1 TB(As it is FATA) will take lot of time.

Re: EVA4000 and leveling

Alzhy — Thu, 17 Feb 2011 16:53:47 GMT

No article but common sense.

The amount of time it takes to level as a result of remoing/adding disks in a diskgroup is directly proprtional to the number of disks in a diskgroup and of course the size of the disks.

1TB FATA drive removal/addition in a 240 disk DG will take days. On a 120 disk DG in an EVA8000 with 450GB FATA drives - it averages our array 4 days.

Re: EVA4000 and leveling

inex — Thu, 17 Feb 2011 17:00:22 GMT

If we lets say expand with 5 drives, leveling takes about a week. And new space is not available before 1-2 days

Re: EVA4000 and leveling

Alzhy — Thu, 17 Feb 2011 17:02:46 GMT

That will be true. But space sometiems would be incresingly available as leveling progresses.