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Am Wed, 11 Dec 2013 06:15:06 +0000
schrieb "Tyler J. Wagner" <tyler AT tolaris DOT com>:
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> On 2013-12-10 21:05, Stefan Peter wrote:
> > An internal LVM based (software) RAID 2 may have been the better
> > solution in this regard.
>
> Stefan,
>
> The software RAID in Linux is MD RAID, or mdadm (the command). LVM2 is
> not RAID. What you want is a software RAID 1 (mirror), although LVM on
> top of that is often useful.
Actually, if you have three or more pvs for lvm (on non-raid disks),
using these for a mirrored-lv is more versatile then plain
software-raid as you can change/move more things around. You just need
three pvs because lvm forces the mirrorlog to be on a different pv then
the mirrors (which makes sense). But it actually doesn't force you to
have the mirrorlog on a different hdd, partitioning your 2TB disk
into [1GB, 1TB, rest of 3TB] gives you three pvs to create a
mirrored lv with the log on the first and data on the second and
third partition:-) Of course you only gain slower speed with that, no
security. But to get acquainted with the commands its great.
Have fun,
Arnold
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