how to tune disk IO

[Nabil Boussetta]

how tu tune disk IO on a hp-ux11iv1 system ?

[Devender Khatana]

Hi,

You can not do much for a indisual disk. But you can plan your VG's in stripping so that maximum no. of disks are used for any transfer resulting in maximum throughput.

HTH,
Devender

[Pete Randall]

That is a pretty broad subject and a lot would depend on the type of disk and how it was set up and how it was attached. If you have access to the Technical Knowledge Base (requires a support contract), there are several generic performance tuning white papers which might help you:

DocID

KBRC00000947
KBRC00016774
UPERFKBAN00000726


Pete

[Nabil Boussetta]

disks are on a sun (eva3000). how to improve performance ?

[Geoff Wild]

Well....best place to start - take the HP-UX Performance and Tuning course.

Tuning disks check -
% utilization
queue
amount of physical I/O
Buffer Cache hit ratio - you want > 90%

sar -d 5 5

If avwait > avserv - then you have an issue

How to tune?

add more disks to offload busy ones
add more controller cards - to split load
add faster disks (15K rpm)
Disk striping
mirroring

Rgds...Geoff

[Cem Tugrul]

Nabil,

i have also EVA5000 and once upon a time
i have also needed and discussded it with
HP...
There is no monitor tool for to EVA disks
Because they are build with high techology
and never needs such a kind of monitoraziton
so just trust your EVA env!!!

Good Luck,

[Cem Tugrul]

opssss,at once i thought you were asking
EVA disks performance
:-)
But if you want your hp-ux box then
Geoff's reply will be significant
and also you may use Glance but it is a license product from Hp
Good Luck