On Fri, Jul 26, 2013 at 11:37 AM, Craig Sanders <cas@taz.net.au> wrote:
>
> On Thu, Jul 25, 2013 at 07:13:25PM +1000, Russell Coker wrote:
> > On Tue, 16 Jul 2013, Craig Sanders <cas@taz.net.au> wrote:
> > > my main zpools (4x1TB in RAIDZ1) are about 70% full. I probably
> > > should start thinking about replacing the drives with 4x2TB
> > > soon...or deleting some crap.
> >
> > 2*4TB would give you twice the storage you've currently got with less
> > noise and power use.
>
> and faster than raidz or raid5 too, but it would only give me a total of
> 4TB in a mirrored/raid-1 pair. seagate ST4000DM000 drives seem to be the
> cheapest the moment at $195...so a total of $390.
>
> noise isn't an issue (the system fans are louder than the drives, and
> they're low noise fans), and power isn't much of a concern (the drives
> use 4.5W each idle, 6W in use)
>
> i've been reading up on drive reviews recently - advance planning for
> the upgrade - and while the ST4000DM000 has got good reviews, the WD
> RED drives seem better. 4TB RED drives aren't available yet, and 3TB
> WD30EFRX drives cost $158 each.
I would not give the red drives much consideration as they are mostly a marketing change over the blacks. Based on reports from companies
like backblaze I would consider hitachi deskstars if the budget permitted
else go with seagate DM series
Anything advertised for enterprise purposes is really pointless.
WD blacks or reds are also appropriate but avoid the greens (stupid idle timeout.)
> > How do you replace a zpool? I've got a system with 4 small disks in a
> > zpool that I plan to replace with 2 large disks. I'd like to create
> > a new zpool with the 2 large disks, do an online migration of all the
> > data, and then remove the 4 old disks.
>
> *snipping text*
>
> if you're converting from a 4-drive raidz to a 2-drive mirrored pair,
> then this is the only way to do it.
the static vdev sizing is truly one of the few annoying things about zfs