Re: [opensuse] mdadm --grow

On Fri, Oct 31, 2008 at 4:58 AM, Per Jessen <per@xxxxxxxxxxxx> wrote:
Greg Freemyer wrote:

On Thu, Oct 30, 2008 at 8:02 AM, Per Jessen <per@xxxxxxxxxxxx> wrote:
Greg Freemyer wrote:

All,

I'm conceptually putting together a NFS server in my head. (I will
build it once I know what it is!!)

What I want is something flexible.

ie. Have it start with 3 or 4 drives, then add a drive when I need
the capacity. Remove a drive when I don't. replace the drives with
bigger drives as the become available. All without losing my data.
(Or having to back it up / restore it.)

My first thought - LVM.

I'm very familiar with LVM. It does not really do the same things as
RAID. Not even if you only worry about the performance side of
things. ie. a 4 disk raid system is faster than a single disk for
most raid setups. With LVM based on 4-drives, it is typically just
the same speed as a single disk.

Completely agree, but I read your requirements above to be more to do
with space management than performance.

This is linux!! I want functionality and speed!!

Seriously, I am very intrigued by the QNAP TS-509 NAS. Its Ubuntu
based, but it seems to give the user full ssh access.

It does automatic online Raid Expansion and Raid Migration. I don't
know if they are using mdadm --grow to do it, or if they have custom
code.

Per a review I read, you can even hook up a monitor/keyboard and
login. (The review is really good and is at
http://www.smallnetbuilder.com). They use cookies, so I can't post a
direct link.

Greg
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