topic Re: decrease the size of an lvm in Operating System - HP-UX

decrease the size of an lvm

RobertCarback — Wed, 20 Feb 2008 15:47:20 GMT

HP-UX 11.23 IA64

I have 3 lvms mounted ---

lvmA has filesystem - /fsA
lvmAa has filesystem - /fsA/a
lvmAb has filesystem - /fsA/b

If I remove lvmA and /fsA (not the directory, just the fs) will it affect lvmAa(/fsA/a) and/or lvmAb(/fsA/b) ?

Re: decrease the size of an lvm

Pete Randall — Wed, 20 Feb 2008 15:57:13 GMT

No, not if I understand you correctly.

Pete

Re: decrease the size of an lvm

Duncan Edmonstone — Wed, 20 Feb 2008 15:58:10 GMT

Robert,

You would have to :

a) Run a backup (I hope before doing this sort of thing!)
b) Use umount to unmount all 3 filesystems
c) use lvremove to get rid of lvmA
d) Use mkdir to create the mount points /fsA/a and fsA/b, which won't be there any more (they were in the filesystem you've gotten rid of)
e) Use mount to mount up the 2 remaining filesystems.

So it will affect the filesystems in the you'll need to unmount/mount them, but their contents will be unchanged.

HTH

Duncan

Re: decrease the size of an lvm

Geoff Wild — Wed, 20 Feb 2008 17:00:31 GMT

Sort of...

You will have to unmount /fsA/a and /fsA/b, then /fsA

lvremove lvmA and update fstab.

Then mkdir /fsA/a and /fsA/b, then remount those 2 file systems....

Rgds...Geoff

Re: decrease the size of an lvm

Tim Nelson — Wed, 20 Feb 2008 17:03:22 GMT

If I understand this correctly.

/fsA is a parent of /fsA/a and /fsA/b

They all have to be unmounted in order to unmount /fsA

If you want to remove filesystem lvmA then you will have to create the mount points of /fsA/a and /fsA/b in order to remount those. The data in lvmAa and lvmBb will not be effected as you are only removing lvmA.

Filesystems are independant of each other but the mount points in your case are not. They are dependant and the parent.

Re: decrease the size of an lvm

RobertCarback — Wed, 20 Feb 2008 17:21:59 GMT

thanks