topic VA7400 performance in Disk Enclosures

VA7400 performance

CARLOS SOUSA — Fri, 12 Aug 2005 10:25:48 GMT

Hello,
We have a VA7400 array with 73 x 73GB in auto raid. Yesterday we tried to copy from one lun to another about 15GB of files. The all process took 4H ?!?!?!?!? and the overall performance of the array was badly damage.

Any ideia of how to fix this bottleneck ?

Re: VA7400 performance

Torsten. — Fri, 12 Aug 2005 11:28:21 GMT

Hi Carlos,

please tell us some more details about your configuration (host,OS, connection ...).

Re: VA7400 performance

CARLOS SOUSA — Fri, 12 Aug 2005 12:53:42 GMT

Hi,
VA7400 is connected to a 2 x 1GB Brocade Switchs for redundancy and a SunSparc V880 Solaris Server v 8.0 with FC HBA's. What we have done was "mv" of one filesystem from one LUN to another one.

Thanks in advance for your help

Re: VA7400 performance

Torsten. — Fri, 12 Aug 2005 13:14:15 GMT

performance depends on many, many things.
First, what firmware is on the box?
Try a search in the forum for va7400 performance and you will find many hints like this thread

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=139864

Re: VA7400 performance

Mahesh Kumar Malik — Sun, 14 Aug 2005 03:36:31 GMT

Hi CARLOS

You may disable Write Cache option to see remarkable improvement in VA7400 performance

Regards
Mahesh

Re: VA7400 performance

CARLOS SOUSA — Sun, 14 Aug 2005 07:05:55 GMT

Hi Makesh,
Thanks for your reply. As far as I know after firmware rev HP15 was introduced a new read pre-fetch algorithm in read cache that is disable by default. What will be the expected impact on overall performance if we turn it enable ?

Regards
Carlos de Sousa