splitting the luns on an FC60

[JOHN TURNER_2]

We have run out of space on our testbed FC60 diskarray, and we are wanting to split down all the luns and remove the mirrors so that we have just two JBOD's, instead of a lun that contains 2 disks

Any ideas would be much appreciated

[Bernhard Mueller · Accepted solution]

John,

you will have to umount filesytems, deactivate and vgexport the vg, destroy the two-disk RAID1 Lun and recreate a new LUNs. Then create new vg/lvols/filesystems and restore data from backup.

Regards,
Bernhard

[Bernhard Mueller]

John,

if you have more than one LUN or two disks to break up, you could consider creating a RAID5 LUN which would gain space *and* still protect you against a single disk failure.

If a RAID0 LUN fails you need to destroy and re-create it.

Also you could potentially have two disks, each holding a RAID0 LUN and use MirrorDisk (if you have it) and mirror maybe just a single small but important filesystem from one LUN (LVM PV) to the other.

Regards,
Bernhard

[JOHN TURNER_2]

Cheers for the info,

Any chance of giving me the cmds for performing the split and recreation of single jbod's, as im fairly new to disk array work

[Bernhard Mueller]

John,

easiest way is to use SAM.
commands are
amdsp -i to identify array
amdsp -a to display all data
amcfg to configue
man amcfg should help

Regards,
Bernhard

[Bernhard Mueller]

this should be a link to the FC60 UG

http://search.hp.com/redirect.html?type=REG&qt=A5277&url=http%3A//h20000.www2.hp.com/bc/docs/support/SupportManual/lpg28492/lpg28492.pdf&pos=1

[JOHN TURNER_2]

Can anyone shed some light on the cmd to unbind the luns on an FC60

Thanks john

[Bernhard Mueller]

amcfg -D

[Bernhard Mueller]

Note: you should never delete LUN 0, but only "replace" if necessary.

(one of the reasons I posted the link to the UG)