Re: RAID for large disks
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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@damtek.com
> <mailto:damon@damtek.com>> 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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