LVM stripping ---VA7110

[Rgomes]

Hi All,

How can I stipe lvols under VA7110? Using HPUX 11.23 and MC/SG. The VGs will be in cluster.

Thanks and regards,
Richard

[Leif Halvarsson_2 · Accepted solution]

Hi,
I am not sure I understand you correct. The LUNs in the diak array is already striped across all disks. I can see no meaning with striping again with the LVM.

[Bernhard Mueller]

Richard,

Leif is absolutely right, the VA7xxx Arrays internally stripe across all disks in a so-called redundancy group. So setup is very easy. Create a LUN of the desired size and use this single LUN in a vg.

Regards,
Bernhard

[Rgomes]

Hi Lief and Mueller,

OK, I understand now.
But, will it be a good idea to create 2 LUNs in different RG per VG for IO speration?

For cluster VGs, should I create lvols with strict allocation policy?

Thanks a lot for your replies,
Richard

[Seth Kaplan]

Richard,

I posed a similar question some time ago. I usually create two luns one on each RG. Essentially this is a manual method for load balancing across the HBA's and VA controllers. After creating the PV's and VG I'll run lvcreate -i 2 -I stripedepth -L size in MB -n lvolname /dev/vgxx. The stripedepth depends on what you're putting on the lv. For filesystems I believe the default is 64k. I use 4k for our Informix db chunks.

Seth

[Karthik S S]

Hi,

As others have responded the Disks are already striped in VA7110 (AutoRAID). If you still want to stripe it across the RGs you can make use of LVM striping.

-Karthik S S

[Rgomes]

Thank you all!

richard