ZFS raidz and 4k sector disks

[Alexey Tarasov]

Hello.

I have reviewed a lot of discussion about new WD 4k sector disks (...EARS).
I have RAIDZ pool of such disks with very bad performance. Now my GPT ZFS partitions don't start from value dividable by 4 (162).
Some guys noticed that aligning ZFS partitions according to recommendation wouldn't help at all because RAIDZ uses variable stripe size.
So where is the bottleneck of this configuration: 1) in ZFS which doesn't know about 4k sectorsize? 2) maybe somewhere inside FreeBSD VFS code or disk driver code? 3) somewhere else?

If you doesn't want to use ZFS there are two ways to deal with this problem:
1) Use GNOP with virtual 4k sectorsize.
2) Use UFS on properly aligned partition and some tuning.

--
Alexey Tarasov

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