topic Remove Mirror in Operating System - HP-UX

Remove Mirror

David Pscheid — Tue, 06 Jun 2000 14:58:17 GMT

I am a relatively new sysadmin. We have a K200 with 16 2gb and 2 4gb disk mirrored. This used to be our production server, but now we want it to be used for test/development.
Each logical volume has 2 physical volumes mirrored accross two controllers.
I want to unmirror the disk so I can utilize all 40gb for the test & development data. I know I need to do the lvreduce - m 0 for each logicalvolume, but I am unsure what steps I need to do next so I can make the 'new' disk usable.
I am guessing I need to rename the 'new' logical volumes since they have have the same name, only a different physical path, but am not sure which commands need to be issued in which order.
Thanks in advance.
Dave Pscheid

Re: Remove Mirror

Brian M. Fisher — Tue, 06 Jun 2000 17:12:55 GMT

Use the following steps:
1) lvreduce -m 0 /dev/vgXX/lvolX
/dev/dsk/c#t#d#
(This will remove the specified PV from the mirror)
2) lvcreate -L ### /dev/vgXX
(Create a logical volume size ### to volume group XX with the next available logical volume number)
3) newfs -F hfs /dev/vgXX/lvolX
4) mount /dev/vgXX/lvolX /mountpoint
5) add entry to /etc/fstab

Brian
<*(((>< er

Re: Remove Mirror

CHRIS_ANORUO — Wed, 07 Jun 2000 09:14:18 GMT

I would do "lvreduce -m 0 /dev/vg00/lvol10 /dev/dsk/XXXX. "XXXX" = disk device you want to remove mirroring from. Once you reduced all the lvols off the disk, if you want to put a new volume group on it don't forget to vgreduce it out of the current vg. "vgreduce /dev/vgXX /dev/dsk/XXXX. You can also do this in one step with the lvreduce command. lvreduce -m 0 /dev/vg00/lvol3 /dev/dsk/c*t*d*, or using SAM to split the disks and removing the copies. (Note: the disk specified is the one you wish to free, not the one you wish to remain in the volume group.)