[aklug] lvm and raid?

I'm noodling around with raid and lvm (Virtualbox is wonderful!).

Googling shows a lot of folks are setting up two sets of software raid, one for a boot
partition and one for 'everything else', for example:

/dev/md0 /boot /dev/sda1 /dev/sdb1
/dev/md1 /dev/sda2 /dev/sdb2

then they'll make an lvm group out of /dev/md1 (I understand that grub doesn't grok lvm,
hence the mdraid for /dev/md0).

but lvm can be set up to do it's own mirroring, so I'm puzzled as to why so many are
using mdraid to mirror underneath lvm ?

Anyone have any knowledge or insight into this?

thanks!
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Received on Fri May 15 10:39:22 2009