Re: RAID for large disks
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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,
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
"Kittens give Morbo gas. In lighter news, the city of New New
York is doomed."
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