I considered this as well, but that's the beauty of marrying ZFS with
a hotplug SATA backplane :)
I chose the to use the 5-in-3 hot-swap chassis in order to give me a
way to upgrade capacity in place, though the 4-in-3 would be as easy,
though with higher risk.
1. hot-plug a new 500GB SATA disk into the 5th spot in the backplane.
2. zpool replace mypool c1t3d0 c1t4d0
where c1t[0-3]d0 are my currently active 250GB drives
3. wait for resilver to complete.
4. hot-pull c1t3d0 and pull the drive from the chassis, replace with
new 500GB drive, hot-plug back into backplane.
5. zpool replace mypool c1t0d0 c1t3d0
6. wait for resilver to complete, rinse and repeat.
As soon as all disks have been replaced, my zpool will be 1TB, not 500GB.
On 9/27/07, zfs-discuss-request@xxxxxxxxxxxxxxx
> Date: Thu, 27 Sep 2007 13:20:15 -0500
> From: David Dyer-Bennet <dd-b@xxxxxxxx>
> Subject: Re: [zfs-discuss] Best option for my home file server?
> To: zfs-discuss@xxxxxxxxxxxxxxx
> Message-ID: <46FBF45F.7050608@xxxxxxxx>
> Content-Type: text/plain; charset=UTF-8; format=flowed
> Blake wrote:
> >> Obviously from a cost AND size perspective it would be best/smart to go
> >> for option 3 and have a raidz of 4x250 and one of 6x500.
> >> Comments?
> How long are you going to need this data? Do you have an easy and quick
> way to back it all up? Is the volume you need going to grow over time?
> For *my* home server, the need to expand over time ended up dominating
> the disk architecture, and I chose a less efficient (more space/money
> lost to redundant storage) architecture that was easier to upgrade in
> small increments, because that fit my intention to maintain the data
> long-term, and the lack of any efficient easy way to back up and restore
> the data (I *do* back it up to external firewire disks, but it takes 8
> hours or so, so I don't want to have to have the system down for a full
> two-way copy when I need to upgrade the disk sizes).
> David Dyer-Bennet, dd-b@xxxxxxxx; http://dd-b.net/
> Snapshots: http://dd-b.net/dd-b/SnapshotAlbum/
> Photos: http://dd-b.net/photography/gallery/
> Dragaera: http://dragaera.info
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