[LUNI] LVM /Raid5

[Steve Sennebogen]

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
> --
>        .--.
>       |o_o |                   Freedom of Choice
>       |:_/ |           __
>      //   \ \         / /     __  __  __  __  __ __  __
>     (|     | )       / /__   / / /  \/ / / /_/ / \ \/ /
>    /'\_   _/`\      /_____/ /_/ /_/\__/ /_____/  /_/\_\
>    \___)=(___/
>
> --
> Linux Users Of Northern Illinois - Technical Discussion
> http://luni.org/mailman/listinfo/luni
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://luni.org/pipermail/luni/attachments/20060928/a79f8501/attachment.html