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splitting the luns on an FC60

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JOHN TURNER_2
Frequent Advisor

splitting the luns on an FC60

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
GUI's are for wimps!
8 REPLIES
Bernhard Mueller
Honored Contributor
Solution

Re: splitting the luns on an FC60

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
Honored Contributor

Re: splitting the luns on an FC60

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
Frequent Advisor

Re: splitting the luns on an FC60

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
GUI's are for wimps!
Bernhard Mueller
Honored Contributor

Re: splitting the luns on an FC60

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
Honored Contributor

Re: splitting the luns on an FC60

JOHN TURNER_2
Frequent Advisor

Re: splitting the luns on an FC60

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

Thanks john
GUI's are for wimps!
Bernhard Mueller
Honored Contributor

Re: splitting the luns on an FC60

amcfg -D
Bernhard Mueller
Honored Contributor

Re: splitting the luns on an FC60

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

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