Re: DragonflyBSD on Areca w/ HAMMER

[Dean Hamstead <dean@xxxxxxxxxxxxxxx>]

> 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.


Dean


> Regards,
>
> Michael
>
> > On Tue, May 31, 2011 at 1:07 AM, Dean Hamstead<dean@fragfest.com.au>
> > wrote:
> > > 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
> > > being
> > > 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
> > > independently.
> > >
> > > 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.
> > >
> > > Dean
> > > --
> > > http://fragfest.com.au

--
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