Bryan Wagoner wrote:
Well since we are talking about for home use, I never tried as a spare, but if
you want to get real nutty, do the setup cindys suggested but format the 600GB
drive as UFS or some other filesystem and then try and create a 250GB file
device as a spare on that UFS drive. it will give you redundancy and not waste
all the space on the 600GB drive.
Zfs allows the use of file devices instead of hardware devices "zfs create test
/tmp/testfiledevice" as an example
However, I do not believe it is safe to use files under UFS as ZFS vdevs.
ZFS expects data to be flushed and, IIRC, UFS does not guarantee that for
regular files. Search the archives for more info.
That said, you can certainly divide the 600 GByte disk into 3 slices.
Later, you can always replace a slice with a different, bigger slice to
grow.
-- richard
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