On Thu, 2006-06-01 at 04:36, Jeff Bonwick wrote:
> It would be far
> better, when allocating a B-byte intent log block in an N-disk
> RAID-Z group, to allocate B*N bytes but only write to one disk
> (or two if you want to be paranoid). This simple change should
> make synchronous I/O on N-way RAID-Z up to N times faster.
I dunno about *wanting* to be paranoid...
I'd think that, to provide the same level of survivability in the face
of disk failure as regular data, you'd need to write to a minimum of 2
disks in a regular RAID-Z and a minimum of three in a dual-parity raid-Z
...
- Bill
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