[kwlug-disc] Bundling HD's. LVM vs mdadm vs ???

L.D. Paniak ldpaniak at fourpisolutions.com
Thu Apr 11 09:24:25 EDT 2013


You might want to consider ZFS on Linux: http://zfsonlinux.org/

Among other things, ZFS replaces the RAID/LVM/filesystem model with a
disk pool/filesystem model that is considerably more flexible and easy
to expand.  Throw in snapshots, data scrubbing, block devices and other
features and you have a free storage environment that is difficult to
beat at any price. ZFS  raidz (~RAID5) is going to require more hardware
than the JBOD configuration you suggest below, but wouldn't you prefer
if your 2TB+ of data could survive a single-drive failure?

And it's WAF approved.

On 04/11/2013 09:01 AM, unsolicited wrote:
> I'm running out of backup space, so I'm probably going to buy a larger
> drive, and move a current drive into another computer - expecting to
> bundle it with the drive already there into a single logical
> presentation. (Add 4TB, move 2TB -> 2TB + 2TB = 4TB.)
>
> I don't 'do' RAID (at least at home, where high availability isn't an
> issue), and mistrust striping - lose 1 drive, both be gone. I prefer
> to say 'this' amount of space for 'this' purpose, so when I run out of
> space I'm aware of and address the issue.
>
> (Presumably a worst case scenario for such bundling upon failure is
> losing one file - the one that crosses physical drives. Correct, even
> today?)
>
> I've known for some time LVM is out there, just never needed it.
> There's also mdadm ('LINEAR') [Which I gather LVM calls upon.]
>
> Any particular pros / cons / preferences / suggestions / thoughts for
> bundling multiple drives into a single logical drive?
>
> -----
>
> I'm guessing the only reasonable drive out there at the moment is a WD
> Black - (5 yr warranty, 7200, SATA3, availability / stock levels).
> Counter suggestions?
>
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