[SATLUG] Re: now help with raid setup on linuxmce box

Todd W. Bucy toddwbucy at grandecom.net
Tue Sep 23 07:14:29 CDT 2008

On Mon, 2008-09-22 at 17:58 -0500, John Pappas wrote:
> Your discussion below includes ZERO redundancy.  RAID 0=No Redundancy.  My
> suggestions inline below:
> On Mon, Sep 22, 2008 at 13:11, Todd W. Bucy <toddwbucy at grandecom.net> wrote:
> >
> > In this particular box I will have 2 320 gig and 2 500 gig drives.  with my
> > raid I want it all redundancy, as much
> > space as possible and speed.
> How does this sound:  Partition up the 500GB disks like so:
> SDx1 = 128MB RAID (Linux fd = raid autodetect) Bootable
> SDx2 = 6GB RAID (linux fd)
> SDx3 = ~174GB RAID (linux fd)
> SDx4 = 320GB RAID (linux fd)
> Then set up /dev/md0 with RAID 1 (Mirror) with the SDx1 partitions for
> /boot, set up /dev/md1 with RAID 1 using SDx2 for SWAP, set up /dev/md3 with
> RAID 1 using SDx3 for LVM (LVs: root, var, home), and SDx4 and the SDx1 from
> the 320's for a 4 disk RAID 5 Array (/dev/md4) using the 2x 320Gb disks and
> 2x 320GB Partitions.  Then LVM  That would net ~960GB of protected media
> storage and 174GB of protected storage for system and user files.  You could
> then set up LVM on md4 to allocate as needed, or just have it be one big
> file system (ie /video or the like).
> > I know that I cant have it all (i dont have the $$) so I am trying to
> > figure out a strategy....I was thinking of
> > doing a raid0 of 2x320 = 640 and a raid0 of 2x500 = 1tb then lvm the two
> > raid arrays for approximately 1.64 tb.

I thought of something like this but was warry.  I seem to remember a
discussion on this topic a while back that trongly discouraged setting
up multiple raids on the same drives.  Are there any particular worries
that I need be aware of?  I know that if I have a failure of one of the
500 GB drives getting it replaced will be real complicated.  Are there
strategies for addressing this now so as to make my life easier then?


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