topic Re: Mirror Linux Root disk in Operating System - Linux

Mirror Linux Root disk

TechC — Tue, 30 Dec 2008 21:02:57 GMT

Hello list,
Can I mirror the root disk of a Fedora or RedHat box using LVM similar to HP-UX? I see Fedora 9 and 10 use lvm2 but the documentation does not mention mirroring the root disk from what i see. I am looking at the RedHat LVM administrators guide here.

http://www.redhat.com/docs/manuals/enterprise/RHEL-5-manual/Cluster_Logical_Volume_Manager/index.html

But I see no procedure to mirror the root disk.
I suppose that I can use
lvconvert -m 1 /dev/lvol /dev/pvol
To create mirrors but there has got to be more
to it than that. With hp you have to make the second
rootdisk bootable and such.

Any hints or links will be appreciated.

Thank you
James

Re: Mirror Linux Root disk

Ivan Ferreira — Tue, 30 Dec 2008 21:59:13 GMT

Root mirroring normally is not done with LVM, but with MD devices, see mdadm and the installation guide for RAID devices configuration.

Re: Mirror Linux Root disk

TechC — Wed, 31 Dec 2008 04:24:26 GMT

Closing this thread..No responses with the exception of Ivan's.

Was able to use Software Raid devices and LVM to mirror the root drive.

James

Re: Mirror Linux Root disk

skt_skt — Fri, 02 Jan 2009 01:26:35 GMT

Mirroring at the LVM level is very rare with Linux. Rather you could see more hardware raids(RAID1 and RAID5 more often) for the root disks which give the intended results.