Storage

[Paul Bertino]

I have a rp4440 HP-UX 11.11. I have local disks running out of space, would it be possible to expand the local disks with an EMC SAN?

[IBaltay]

Hi,
if you use LVM you can rather put the EMC storage LUNs into the VG, mirror them and then split the mirror and reduce the local disks from the VG. Then you are flexible to extend the VG according to your needs via the new EMC storage LUNs only.

[Paul Bertino]

Thanks. We have our SAN setup in the sense of mirrored, but the drives we use on the local are 70 GB. What size do you think we should use on the SAN? Also, I heard we could use soft links from the local to the SAN?

[IBaltay]

maybe this could help you:
http://docs.hp.com/en/6054/LVM_Limits.pdf

[IBaltay]

for the front end load balancing the best is to give the host as many LUNs as it has the hardware paths to the storage, e.g. if you have 4 connections to the EMC Storage (the number of connections equals to the number of the storage front ports connected to the SAN fabric), then it is better to give the 4 LUNS x 25GB instead of 1 LUN x 100GB and than configure them e.g. via the PVlinks.