file system configuration using vdisk

[Paul_481]

Hi,

We are using EVA5000, 1 disk group (80 disk). Assuming all are equal, what configuration will provide the best performance.

A volumegroup that has multiple LUNs or a volume group that has a single large LUNs only.

I was wondering if the principle of spreading the spindle also apply using virtualization. I assume that there will be no difference in performance since, they both belong the the same disk group.

Any opinion will be appreciated.

Regards,
Paul

[Duncan Edmonstone · Accepted solution]

Paul,

Well I'd always have at least 2 LUNs, as this way you can prefer the paths on the 2 EVA controllers and increase your bandwidth - remember a single LUN uses only 1 controller on the EVA.

Of course if you have other hosts preferred to the other controller, there may be no benefit in even using 2 LUNs.

HTH

Duncan

[Devender Khatana]

Hi,

Exactly as Duncan clarified use atleast two LUNs as you have two paths to your EVA. Also note that you will have two device files for both LUNs starting with two different controllers. Configure first LUN using device file that use one controller as primary path and for the second LUN give primary path using the other controller. This way you can have effective load balancing using diffrent controller to access different LUNs.

HTH,
Devender

[Duncan Edmonstone]

Devender - As this is an EVA, the setting of the preffered paths will be done in SecurePath or via Command View, not via giving different disk channels when adding the devices to a volume group.

HPUX PVLinks DO NOT work on the EVA.... yet

HTH

Duncan

[Devender Khatana]

Hi,

Thanks for the update Duncan.

Regards,
Devender

[Paul_481]

OK guys, thanks for your response.