Veritas Volume Manager poor performance

[R D SUNDAR RAJAN]

I have a Nclass/512Mb memory hp-ux 11.0 and Veritas Volume manager 3.0 installed.When I create a striped volume using Veritas volume manager it gives poor performance and HP LVM is acceptable. Are there any guidelines or parameters that can be tuned to improve the performance. Upgrading HP-UX or Veritas volume manager is not possible. do you know of any known patch ? Any help would be much appreciated.

[Wodisch]

Hi,

have you tried the official documentation already:

Look here
http://docs.hp.com/hpux/11i/index.html
for the paragraph under "VERITAS Volume Manager", which leads you to:

http://docs.hp.com/hpux/onlinedocs/B7961-90027/B7961-90027.html
http://docs.hp.com/hpux/onlinedocs/B7961-90026/B7961-90026.html
http://docs.hp.com/hpux/onlinedocs/B7961-90025/B7961-90025.html

HTH,
Wodisch

[ashish nanjiani]

Hi

Can you share some more info like across how many disks the strip is set, also if you are using mirror along with striping. What kind of application you are running on the strip disks. Are the applications read intensive or write intensive.

ashish

[R D SUNDAR RAJAN]

I am striping across 5 disks . It is a 5 column stripe. It is 11.0 and not 11i. The performance of Veritas Volume manager on 11i is far better than the traditional LVM.

[Phil Smith]

There is a known issue with VxVM 3.0 and HP-UX 11.00

We have raised a support request and received the following answer from the support centre:-

"I have already followed up on another case
for CR JAGad97185 and JAGae14226 (11i) and I have been advised by our Expert
Centre and Labs that the decision was made not to backport an 11i (11.11)
interface to 11.0 and the change request has been closed."

We have requested a business escalation via our account manager I suggest you do the same in order to get the 11i patch backported to 11.00

The change that affected the performance of VxVM was introduced by patch PHKL_20759 which is a critical patch. (I.E. Required to be supported)

Any support from large HP account holders would be greatly appreciated.