On 10/01/2011 14:07, Bruce Cran wrote:
On Mon, 10 Jan 2011 13:49:08 +0100
Ivan Voras<[email protected]> wrote:
It depends - since ZFS is logging all the time it doesn't have to
seek as much; if all transactions are WRITE and given sequentially,
they will be written to the drive sequentially, even with full fsync
semantics. But 75k IOPS is a bit too much :)
I've been doing some benchmarking using sysutils/fio recently. It seems
that for my desktop SATA disk (a Samsung F3) around 28-30k iops is about
the maximum, seen both on Windows 7 (NTFS) and FreeBSD (ZFS).
FreeBSD is much more bursty compared to Windows, getting 80k iops and
210MB/s for a few seconds followed by several of 0.
I've also noticed it is bursty - this can be moderated by tuning
vfs.zfs.txg.timeout and vfs.zfs.vdev.max_pending. But I think you must
agree that 210 MB/s on a single drive looks impossible :) I get that
much in a SAS RAID-10 configuration.
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