Vmax Performance issue.....BE high utilization

Lower the workload (Host IO limits?)

Add more hardware

Change raid protection

Without more information, these are common solutions.

What work around can be done immediatly(temporary) to improve the performance. We did an SRDF to this frame and cant take performance questions from app team.

Not sure what the performance problem is, or if it even has anything to do with the backend or not.

I would get a Symm performance person involved.  There should be local folks that can assist.

Host IO limits could slow less critical loads if the workload is just too much.

Are you able to identify which host consume much resource? Comparing the IOps and MBs/sec, greate than 100KB IO occurr from you APP server. I suspect there are Apps has big I/O which utilize much backend resource. Maybe writing lot of data which cause Cache WP% is high.

I'd like to indentify the hosts and apply hostIO limiatation function may help temperary and follow Quincy56's suggestion to engage EMC local team for next steps

I am having the same problem. BE utilization and response time is high. There is no SRDF. Please suggest a fix.

it can be difficult and time consuming to try and solve performance problems here.  I would suggest a CS performance case be opened with EMC.  It sounds like there is too much workload going to too few SATA drives from what you have described.

microcode is 5876.229.145. the application team is complaining of degraded performance since we migrated to the vmax. they have response times around 200ms for the sata disk group.

as for the 3 'fixes':

host io limits are set as per emc recomendations

we cannot add more hardware

sata is at r6

Apethe, what code is the box running?

With 5876.229 the DA % busy may be reporting higher than what should be reported.

My first post suggested 3 "fixes".

i am seeing the same load on all sata disks

Hi,

Do you use virtual provisioning in your environment? And how are the metas configured? Striped or concatenated? What is the predominant RAID type?

Based on your answers for the above, I can may be suggest a few things, but my suggestions would really be more of the best practices, I'd recommend you engage a perf specialist from EMC.

Thanks,

Sreehari

Apethe,

Are all drive types RAID 6?  If so, that would explain the high backend utilization.

Hi sreehari,

The entire storage is virtual provisioned

We have 8 way to 32 way metas, striped

Raid type is R6

Ameya

Yes, all the drive types in the screenshot are raid 6. Even with FAST working optimally, the server teams are complaining of high response times.

There is nothing wrong with using RAID6 that adding more drives and/or DAs won't fix.

However your performance issue could be something else.  Again, this should be dealt with via the SR process along with the local performance folks.