Performance waring in Oracle when migrated to VMAX from DMX-3

We have an Oracle DB running on a Solaris server that we recently moved off a DMX-3 to a VMAX array and Oracle immediately began spitting out this warning. 

"The throughput of the I/O subsystem was significantly lower than expected."

The only configuration difference here between DMX and VMAX is that we are using Virtual Pooling on VMAX.  Does anyone know if there are problems with Oracle DBs and Virtual Pools?  Thanks

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12 Replies
3 Silver

Re: Performance waring in Oracle when migrated to VMAX from DMX-3

A lot of considerations required.What are the disk technology used in the Pool...FAST is enabled on the pool or not....if EFD,FC,SATA are used in the Virtual pool and FAST VP is enabled it should not be a problem.....Can you share the Virtual Pool Information???

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Re: Performance waring in Oracle when migrated to VMAX from DMX-3

FAST is not enabled.  The drives are 450GB FC (roughly 560 drives) in one VP pool (RAID5 3+1).

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3 Silver

Re: Performance waring in Oracle when migrated to VMAX from DMX-3

Only FC Drives???NO EFD's??

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7 Thorium

Re: Performance waring in Oracle when migrated to VMAX from DMX-3

that's a pretty nice, wide spread. Were devices configured as fully pre-allocated ? Do you have tools like SPA or Performance Manager to tell you what's going on in the array ?

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4 Beryllium

Re: Performance waring in Oracle when migrated to VMAX from DMX-3

Same front end configuration? FAs?  Same configuration of meta volumes if you were using them before?

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Re: Performance waring in Oracle when migrated to VMAX from DMX-3

The devices were configured as fully allocated.  We used PPME to move the data so the devices/blocks are the same.  The FA configuration is also the same.  The FAs are sharing with more servers but the iops/throughput is comparable to traffic on the DMX.  SPA shows that the Port Group is only 15% utilized and the array appears to be in ideal shape.  IOPS for the FAs are on average about 1,250 iops.

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2 Bronze

Re: Performance waring in Oracle when migrated to VMAX from DMX-3

What's the response time for the storage group in SPA?

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4 Beryllium

Re: Performance waring in Oracle when migrated to VMAX from DMX-3

You have posted a very interesting message from the Oracle. Where do you see this message in Oracle?Do they have a performance issue in real? Ask your DBA to get more details using thier Average Waittime Report and then you can go from there

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3 Argentum

Re: Performance waring in Oracle when migrated to VMAX from DMX-3

And also can check if there are any IO waits being seen. Is ASM used?

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