[DRBD-user] slow sync speed of 12TB over 10GE

Lars Täuber taeuber at bbaw.de
Mon Jan 19 11:31:04 CET 2009


Hi Tomasz,

Tomasz Chmielewski <mangoo at wpkg.org> schrieb:
> Technically speaking, such writes:
> 
>           [==============>.....] sync'ed: 76.4% (242356/1023804)K
>           finish: 0:00:01 speed: 130,240 (130,240) K/sec
> 
> can be also fragmented as well - some area can be out of sync here, some 
> area there - the head will jump.

Yes I'm aware of this, but my sync is the initial one. This should be somewhat linear, shouldn't it?

> It's hard to tell if such difference (258 MB/s dd write speed versus 130 
> MB/s DRBD sync) can be explained by only those items I mentioned.

I'll do some tests on a completed configuration. But this will be not before next week I'm afraid.

Regards
Lars



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