Re: RAID for large disks
- From: Ron Johnson <ron.l.johnson@xxxxxxx>
- Date: Sat, 07 Jun 2008 14:40:28 -0500
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The other reason why I hate gmail is that it, like Outlook,
naturally top-posts...
On 06/07/08 11:52, Mag Gam wrote:
With the RAID array I am planning to use RAID 5 so my data is still
protected. My confusion is going with RAID striping (picking the right
size).
What does the controller manual say?
Also, Does the filesystem layout need to be specific when I do
striping? If I am using 128k stripes, should I start my filesystem on
129k and end with max-(128+1k)?
Huh? Do you mean partition layout?
On Sat, Jun 7, 2008 at 12:38 PM, Damon L. Chesser <damon@xxxxxxxxxx
<mailto:damon@xxxxxxxxxx>> wrote:
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.
- --
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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- From: Mag Gam
- Re: RAID for large disks
- From: Ron Johnson
- Re: RAID for large disks
- From: Damon L. Chesser
- Re: RAID for large disks
- From: Mag Gam
- RAID for large disks
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