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Re: DragonflyBSD on Areca w/ HAMMER

From: Dean Hamstead <dean@xxxxxxxxxxxxxxx>
Date: Wed, 01 Jun 2011 09:32:39 +1000

Well, there is a possibility to add and remove volumes other than the
root volume, but IMHO
it's still considered experimental. In combination with LVM you could
emulate expanding and
shrinking of a Hammer filesystem.

In my case, the underlying raid card can expand the volumes it presents to the operating system as a 'disk' without changing data.

This can also be replicated by dd'ing a small disk to a large disk, or expanding the disk size in a virtual machine.

In freebsd, i can add a new disk to the raid set and expand the volume live (thats the card). Unmount /dev/da0 (i format the disk raw, rather than slicing it), rescan for devices - the disk is re-detected as being bigger- then i run growfs /etc/da0. mount that volume and off i go.

obviously im not mounting /dev/da0 as /, otherwise unmounting it would go rather badly.

So basically im looking to do the same with HAMMER. But gaining snapshots and dedeplication etc over UFS.




On Tue, May 31, 2011 at 1:07 AM, Dean Hamstead<dean@fragfest.com.au>
Hi Guys

Im thinking about reloading my home file server with dragonflybsd.
Mainly so
i can take advantage of the rather awesome looking HAMMER filesystem.

My home server has an Areca 1260 SAS raid card, which is reported as
supported by the arcmsr man page.

Im looking for confirmation from other users that areca cards work
well, and
that the admin tools are supported from freebsd or otherwise implemented

Also id like to get some feedback that HAMMER is up to the task of being
belted really hard over sustained periods.

Im also not able to see find a conclusive answer to if HAMMER can be
expanded (as im relatively frequently adding more disks, and
expanding my
raid array - currently im using UFS tool growfs)

I have dabbled with ZFS on freebsd, but found it wanting. HAMMER
seems much
more 'next generation' - rather than just collapsing some raid
features in
to the filesystem.


-- http://fragfest.com.au

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