LVM and RAID

[Mike Reinehr]

On Thursday 16 June 2005 02:10 am, Roger Oberholtzer wrote:
> I have just been playing with Linux LVM and am quite impressed. It seems
> too simple. At least when set up from SUSE 9.2. I have a few questions
> for anyone who has worked with this:
>
> 1. Are there any gotchas when using a LVM on different distros? Aside
> from the fact that the config may be different? Anything in the LVM
> itself? If I set up a LVM on, say, SUSE, and later move to something
> else (I am not considering this - but I want to know), could I expect
> difficulties?
>
> 2. Can I set up a LVM that is also RAID? That is, having a file system
> with oodles of storage is fine, but what about failure protection?

Roger,

	LVM on top of RAID works like a charm. What I have gotten from other lists, 
and agree with, is to define three md RAID partitions:

	/dev/md0	RAID1	/boot	ext2	(using /dev/sda1 & /dev/sdb1)
	/dev/md1	RAID1	/		ext3	(using /dev/sda2 & /dev/sdb2)
	/dev/md2	RAID1	LVM PV	---		(using /dev/sda3 & /dev/sdb3)

uses sizes you feel adequate for / & /boot & then use all the rest for md2, 
with one VG on the single PV. Then divide up your VG with any all remaining 
file systems (swap, /home, /var, /usr, etc.), as you please. Remember to set 
the partition (/dev/sda... ) types as Linux RAID, so they will be 
auto-detected at boot and don't forget to include md support & device mapper 
support in your kernel.

Cheers!

cmr



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