[LUNI] LVM /Raid5
ssenne1 at uic.edu
Thu Sep 28 23:03:25 CDT 2006
You would be limited to 160 gigs [80 * (3-1)]in the raid5, with the rest
being used for whatever you want. Usually it is desireable to use identicle
drives when planning/building a raid5 array.
I have a volume group on a single device (/dev/md0) using lvm. The reason I
use lvm on raid5 is so that I can start with smaller logical volumes of just
a few gigs a piece, and grow them when I need them to be bigger. I can't do
that with standard partitions.
On 9/28/06, Samir Faci <samir at esamir.com> wrote:
> General question about lvm/raid5. I've done software raid on Linux and it
> works great but I find it somewhat limiting if I want to grow/expand
> (partly due to the nature of raid). So If I want to upgrade my 80GB
> raid1, I need to buy 2 bigger drives.
> LVM has been very slick, combining drives to allocate more drive space.
> I've seen LVM over raid 5, though even on a raid 5, aren't you limited in
> size your smallest drive? So, let's say I have a 80, 120, and 160 gb
> drive, my raid 5 could only go as far as 80 the rest would be just
> unallocated space I can put to other use. So what would the be the
> benefit of doing lvm over raid?
> Samir Faci
> samir at esamir.com
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