On Sat, Jun 7, 2008 at 12:38 PM, Damon L. Chesser <
On Sat, 2008-06-07 at 11:15 -0500, Ron Johnson wrote:
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> On 06/07/08 07:27, Mag Gam wrote:
> >
> > I have a RAID controller with 256MB of on board cache and its connected
> > to 12 500GB SATA disks. I am planning to create 2 RAID groups (6 disks
> > each), but I don't know what is the optimal stripe size should be.
>
> That's very controler-specific. Read the manual.
>
> > Also, once I stripe on the RAID controller I am planning to use LVM. Is
> > striping a good idea? What should I consider for the filesystem?
>
> Striping is a GREAT idea IFF you want serious speed, but don't care
> about your data. If one of the disks goes flaky, *all* the data on
> the stripeset goes poof.
>
> So, *never* use striping on a production server!! Unless you hate
> the company, are vindictive, and are about to leave.
>
> Otherwise, use RAID 0, 10, 0+1 or 5.
>
> If you make huge RAID sets, I don't see the purpose of LVM. OTOH,
for one, if you make a bad partition choice. With LVM, you can shrink
one and grow the other as needed.
> if you make 6 mirror sets, use LVM to make a 6 "device" unit.
>
> Also, Damon is correct about booting. In fact, I'd have a separate
> boot device.
>
> Lastly, to what media are you going to back all this data up? How
> frequently?
>
> - --
> Ron Johnson, Jr.
> Jefferson LA USA
To back up Ron's input:
http://www.linuxjunkies.org/html/LVM-HOWTO.html#s8 it is a bit dated,
but the info is good.
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