topic Re: LVM and mirroring in Operating System - HP-UX

LVM and mirroring

Chris Fadrowski — Mon, 06 Jan 2003 18:59:17 GMT

Here is the question,

I have 2 disks in my server. One disk has Oracle Binaries (10 gig) and (8 gig) of secondary swap. (18 gb drive). I want to mirror my Oracle Binaries to the 2nd disk. How can i go about mirroring my 10 gig LVOL to the other disk. Or do i have to mirror the whole disk instead of the LVOL. Basically i just want to mirror /dev/vg01/lvol21 to another device. I am concerned however that the size of the mirror has to be the same. Can some one layout the procedure for me?

Re: LVM and mirroring

Pete Randall — Mon, 06 Jan 2003 19:02:04 GMT

Chris,

MirrorDisk/UX functions at the Lvol level, so you can mirror either, both, or none.

Pete

Re: LVM and mirroring

Ken Hubnik_2 — Mon, 06 Jan 2003 19:02:27 GMT

Mirroring has nothing to do with the physical disk. It is done on the lvol level.

lvextend -m 1 /dev/vg01/lvol21

Re: LVM and mirroring

Sean OB_1 — Mon, 06 Jan 2003 19:40:59 GMT

Mirrordisk mirrors at the volume level so you can simply mirror the oracle volume to the other disk.

lvextend -m 1 /dev/vgnn/lvoltomirror /dev/dsk/cNtNdN

Re: LVM and mirroring

Rajasekhar Raman — Mon, 06 Jan 2003 21:22:21 GMT

All suggestions made above are absolutely correct. The only other precautionary statement I would make is that make sure the disks are identical in performance, other wise you will be operation at the speed of the slower disk, also if they have the same capacity it helps in case you need to expand the logical volume in the future.