>I'm using zfs not to have access to a fail-safe backed up system, but to easily
>manage my file system. I would like to be able to, as I buy new harddrives,
>just
>to be able to replace the old ones. I'm very environmentally concious, so I
>don't want to leave old drives in there to consume power as they've already
>been
>replaced by larger ones. However, ZFS doesn't currently let me detach a non-
>mirrored device. Is this planned for the future at all? I would imagine
>something like this:
>
>zpool detach --non-mirrored dev ...
> detaching non-mirrored dev... wait for data to be copied
>
>or even
>
>zpool detach --non-mirrored dev ...
> detaching non-mirrored dev... there's not sufficient space to be able to
> remove dev
>
It is unfortunately that you ask this question after you've installed the
new disks; now both the old and the new disks are part of the same zpool.
zpool replace [-f] pool old_device [new_device]
Replaces old_device with new_device. This is equivalent
to attaching new_device, waiting for it to resilver, and
then detaching old_device.
The size of new_device must be greater than or equal to
the minimum size of all the devices in a mirror or raidz
configuration.
new_device is required if the pool is not redundant. If
new_device is not specified, it defaults to old_device.
This form of replacement is useful after an existing
disk has failed and has been physically replaced. In
this case, the new disk may have the same /dev/dsk path
as the old device, even though it is actually a dif-
ferent disk. ZFS recognizes this.
So in order to replace an old disk, you'd use:
zpool replace pool olddisk newdisk
Casper
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