Strange behaviour of UFS2+SU FS on FreeBSD 8-Stable: dreadful perofrmance for old data, excellent for new.

Ivan Voras ivoras at
Sat Aug 27 17:03:11 UTC 2011

On 27.8.2011. 9:21, Lev Serebryakov wrote:

>    I'm going to investigate alter, why it is ony ~180MiB/s, when
> theoretically it should be about (90*4) 360MiB/s linear read, and whom
> to blame: UFS or geom_raid5 or both :)

Try this:

(or it could be a hardware issue - controller bottleneck or something 
like that).

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