On 01/22/2013 10:45 PM, Jim Klimov wrote:
> On 2013-01-22 14:29, Darren J Moffat wrote:
>> Preallocated ZVOLs - for swap/dump.
> Or is it also supported to disable COW for such datasets, so that
> the preallocated swap/dump zvols might remain contiguous on the
> faster tracks of the drive (i.e. like a dedicated partition, but
> with benefits of ZFS checksums and maybe compression)?

I highly doubt it, as it breaks one of the fundamental design principles
behind ZFS (always maintain transactional consistency). Also,
contiguousness and compression are fundamentally at odds (contiguousness
requires each block to remain the same length regardless of contents,
compression varies block length depending on the entropy of the contents).

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