R710/PERC H700/H800/MD1200 disk naming

Dameon Wagner d.wagner at ru.ac.za
Tue Aug 3 08:41:23 CDT 2010

On Tue, Aug 03, 2010 at 12:19:53PM +0100, John Hodrien scribbled
 in "Re: R710/PERC H700/H800/MD1200 disk naming":
> On Tue, 3 Aug 2010, Robin Bowes wrote:
> > On 03/08/10 11:46, Stroller wrote:
> >> On 2 Aug 2010, at 22:11, Ken Nishimura wrote:
> >>> I assume that making a few large virtual disks (mostly segregated
> >>> by disk type and enclosure location) and using LVM to slice and dice
> >>> is the way to go?
> >> I find the thought horrifying. I choose servers like the PowerEdge
> >> because they have hardware RAID. LVM would seem, as a wild
> >> generalisation, to undermine that.
> > Not at all.
> >
> > You still have your hardware RAID, but you can manage volumes and usage
> > more easily on top if it. Much easier than using physical partitions.
> I couldn't agree more, and I think this is really important to stress.
I'll second (or third?) that.

> LVM merely gives you options that you don't have without it.  It's really not
> a pain; treat it simply and there's really very little to it.  There's times I
> am annoyed by a lack of LVM on machines because I find it handy to use what
> LVM can offer me, but it's too late.  There aren't times I find the inverse to
> be the case.

Ever since I found LVM all those years ago, I've loved the flexibility
that it provides -- and for once, this flexibility comes without any
compromise or negative side effect.  I simply don't build servers
without LVM anymore.  And to make Stroller happy, you can still use
file-system labels ;)

> Combine LVM with iSCSI and you really can have some serious fun that you'd
> never even think of if you're not in that mindset.

Again, I heartily agree.  We recently expanded our SAN using Debian,
LVM, iSCSI, and a 16 hot-swap chassis.  Provisioning targets is a
breeze, and unscripted would take only 3 commands, 4 if you're using
ACLs for the initiators. (To be fair, if you want persistence we have
to edit the iSCSI daemon's config file, but that's hardly an issue).

And I haven't even started on snapshot backups either...

LVM is made of win.



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Dr. Dameon Wagner,
Senior ICT Specialist,
Depts. of Computer Science & Information Systems,
Rhodes University, Grahamstown, South Africa.
:Beta tester for Pegasus & Mercury/32 (www.pmail.com):
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