On Wed, Dec 30, 2009 at 11:45:22AM -0700, Josh Aune wrote:
>
> On Dec 30, 2009, at 3:27 AM, Lars Ellenberg wrote:
>
> > On Tue, Dec 29, 2009 at 03:56:17PM -0700, Josh Aune wrote:
> >> Hi,
> >>
> >> Attached is a patch for the users guide.
> >
> > Thanks.
> >
> >> Also, I'm having an issue with sync performance. I have DRBD setup
> >> between two hosts using SRP.
> >
> > SDP maybe?
>
> Ya, that one :)
>
> >
> >> Under optimal conditions I'm able to achieve a 500+ MB/s write speed,
> >
> > How do you measure?
>
> $ iostat -m 1
>
> On both hosts while running a benchmark. On the host with the
> benchmark I see 500+ MB/s register on both the drbd1 and fioa devices,
> on the remote host it registers 500 MB/s on only the fioa device.
>
> While running the initial sync both sides register between 50-80 MB/s
> reads, no writes. Doing a local benchmark using 4 processes of 32k
> reads this device can easily sustain 600+ MB/s.
>
> >> but during the initial sync after the DRBD device is created the sync
> >> proceeds at less than 100 MB/s. Below is the config file. Am I
> >> missing anything needed to bump up the initial sync speed?
> >>
> >> Also, all bytes on the drives on both side are zeros, so the limitation
> >> seems to be in the crc32c processing.
> >
> > Did you look at top, vmstat or similar?
>
> Yes, 87% cpu idle. Nothing much really happening.
Then this seems to be some other config problem.
<shameless plug>
Did you know we sell "DRBD Health Checks"?
http://www.linbit.com/en/products-services/drbd-consulting/
</shameless plug>
;)
Cheers,
--
: Lars Ellenberg
: LINBIT | Your Way to High Availability
: DRBD/HA support and consulting http://www.linbit.com
DRBD® and LINBIT® are registered trademarks of LINBIT, Austria.
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