On Apr 8, 2011, at 2:38 PM, Karl Wagner wrote:
> One of them was simply an alternative way to do a "live CD" environment. As
> ZFS already does COW etc, it would avoid all the hassle you get in e.g.
> linux. You could have a ZFS vdev on the CD, then use a RAM disk as a second
> vdev.

IIRC this idea was discussed here in the past, and there is an RFE for this.

> Another would be, in the case of a failing disk, set that vdev to read-only
> to mitigate the chances of data loss until you can replace the disk.

We already avoid allocating new blocks from failing top-level vdevs, see 
metaslab_alloc_dva():

http://src.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/uts/common/fs/zfs/metaslab.c#1334

Victor
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