On 2013-01-26 22:17, Sašo Kiselkov wrote:
Are you going to be using ZFS on those? If so, how does the ashift of a
zpool created with them look like?
# zdb <poolname> | grep ashift
If it prints "ashift: 12", then you are good, zpool picked up the
correct settings.
Well, to be pedantic, I'd add that ashift only dictates minimum block
size and alignment relative to the storage device provided to ZFS -
the slice or partition. Hardware-alignment of 4kb writes would also
need that the partition itself is aligned with 4KB sectors - i.e. that
its starting offset is divisible by 8 (in classic 512b sector count).
If you dedicate the disk to ZFS and it is automatically partitioned
with GPT, then the problem is taken care of - with offset being 256.
On MBR the default offset is 34 or so, and can present a problem that
is solvable by manual partitioning.
HTH,
//Jim
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