On Wed, Feb 4, 2009 at 9:31 AM, Jean-Paul Rivet <jri...@bigpond.net.au> wrote:
> I've been searching without success if this has been done or even discussed 
> previously.
>
> Would it be possible now or in the future to use an SD Card on a laptop as a 
> cache for ZFS?

> When using 'pfexec zpool add rpool cache c8t0d0' I get:
>
> cannot label 'c8t0d0': EFI labeled devices are not supported on root pools.


>From that error message I believe the problem is not on "laptop" or
"SD Card". It's because you're trying to add cache to root pool.

Try adding it to another pool. It should work.

PS: is your SD card REALLY faster than your HD? If yes, what brand/model?

Regards,

Fajar
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