Bill Sommerfeld wrote:
On Tue, 2006-12-19 at 16:19 -0800, Matthew Ahrens wrote:
Darren J Moffat wrote:
I believe that ZFS should provide a method of bleaching a disk or part
of it that works without crypto having ever been involved.
I see two use cases here:
I agree with your two, but I think I see a third use case in Darren's
example: bleaching disks as they are removed from a pool.
That sounds plausible too. (And you could implement it as 'zfs destroy
-r pool; zpool bleach pool'
We may need a second dimension controlling *how* to bleach..
You mean whether we do single overwrite with zeros, muliple overwrites
with some crazy government-mandated patterns, etc, right? That's what I
meant by "the value of the property can specify what type of bleach to
use" (perhaps taking the metaphor a bit too far) for example, 'zfs set
bleach=<how> <fs>'. Like other properties, we would provide "bleach=on"
which would choose a reasonable default. We'd need something similar
with 'zpool bleach' (eg 'zpool bleach [-o <how>] <pool>').
--matt
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