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8 Krypton

Pool & Logs

IHAC - VMAX with 8 engines and 8 bay filled with 600GB FC

Pools are on Raid5. each pool has 64 spindles. Presented Data & Log ThinDevice luns from these pools (SQL / SAP application) for windows 2008 server.

Application team has come back to us saying performance is very low when they do microsoft speed test on these luns presented to their servers.

Latency is the issue. IT should be less than 10-20 ms as per their requirement. All allignement etc etc is taken care of at server side.

It is a new setup built about 5 months back.

Any best practice missing here from storage side?

If so can i have a validated document?

any suggestion to improve these?

Thanks in advance

Pras

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29 Replies
8 Krypton

Re: Pool & Logs

how many pools do you have and why are they so small (only 64 drives ? )

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8 Krypton

Re: Pool & Logs

16 pools and each pool configured with 64 disks as per EMC

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8 Krypton

Re: Pool & Logs

interesting, have you or EMC looked at pool/disk/FA utilization ? Maybe pools are too small and you are working them too hard and need to buy more spindles to give you more iops.

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8 Krypton

Re: Pool & Logs

That seems like more pools than needed for isolation, but I doubt the problem is a backend one, but it could be.

First, are you using striped meta volumes?  And how many FA CPUs?

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8 Krypton

Re: Pool & Logs

Striped Meta...FA CPU's need to check

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8 Krypton

Re: Pool & Logs

Ok, can you post STP data?  How many members?

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8 Krypton

Re: Pool & Logs

Logged case. EMC support investigating the issue.

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8 Krypton

Re: Pool & Logs

What are you using for multi-pathing?  if its powerpath what does it show while running the test for pathing metrics?

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8 Krypton

Re: Pool & Logs

Powerpath and it is sym_opt

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