Lower performance of EMC DMX 801 with IBM p690

[yurist]

Hi all!

We have met problem that EMC Symmetrix DMX 801 works too much slowly. Even more, second disk array, is connected to IBM p690, IBM FAStT 700, works in 2-3 times more faster.
We tested work with Oracle and with simple reading data on DMX and FAStT.
FAStT-700 speed 120MB/sec - 140 MB/sec
DMX-801 speed 20-40Mb/sec - the same as internal SCSI disk!!!!

Could anyone explain me what we must to do for improving performance of DMX?

Thanks
Yuri

 

[vptl]

Go with 64 bit Solaris I think that is the best if you are looking for performace...

Have DMX running sybase on 15K with Solari 8 no issues.

 

[yurist]

Thank you for advice. But I have problem with DMX, not with AIX.
Can you give recomendation about configuration of DMX?

 

[comtec17]

How are you connected? Are you using fibre? Do you have the EMC recommended drivers and Firmware on the HBA's?

How are the DMX disks setup? RAID1, RAIDS?

 

[yurist]

We are use 4 fiber-channel adapters Emulex LP9802. It is standard adapters for IBM pSeries and RS/6000.
We tried to use RAID0, RAID5 and RAID1.

 

[srinibee]

What is the stripe element size for each LUN. Install HBAnywhere and fine tune the parameters.

regards
Srinivas Bandaru