[DRBD-user] drbd-8.4.2rc1 test results

Dirk Bonenkamp - ProActive dirk at proactive.nl
Fri Aug 17 13:24:50 CEST 2012

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.

Hi All,

After reading the last posts from the last few days about the
synchronisation i've added some figures to my drbd.conf:

        resync-rate             10M; #(this was already there @20M)
        c-plan-ahead            20;
        c-max-rate              30M;
        c-fill-target           20M;

It now synchronises nicely at around 30Mb/s, no big ups and downs any more.

I guess a blog post and maybe some extra detail in the manual would help
on this matter.

8.4.2rc1 still works fine, no problems the last few days.



Op 15-8-2012 12:24, Dirk Bonenkamp - ProActive schreef:
> Hi all,
> I've installed 8.4.2rc1 on my test systems (ubuntu 10.04 x86_64,
> dedicated bonded gigabit nics for DRBD, single seagate 2.5" sata disk,
> 7200rpm, 16Mb cache (ST9160412AS)).
> Installing and upgrading all went flawless (dkms users: don't forget to
> uncomment the modprobe option for the drbd module, this new version
> doesn't need it any more).
> Some dd tests (averages of 3 runs on a system without load):
> dd if=/dev/zero of=1G.bin bs=1024M count=1 oflag=direct
> 8.3.13: 29.5 MB/s
> 8.4.2rc1: 28.3 MB/s
> dd if=/dev/zero of=1G.bin bs=1024 count=1000 oflag=direct
> 8.3.13: 109 kB/s
> 8.4.2rc1: 112.7 kB/s
> No big differences here.
> Resync runs, verify runs all went OK. Fencing works as it should.
> The only weird thing I noticed is the behaviour of the syncer. I've this
> option in my drbd.conf:
> resync-rate             20M;
> But when doing a verify run the rates are al over the place, I've
> noticed values between 3 and 120 MB/s... Even if the 'resync-rate'
> option is ignored and this is the 'auto sync rate', the fluctuations do
> look a bit weird to me. But, as mention above, the result of a resync of
> verify run seems OK.
> I've put some normal workload on the machines and everything works as it
> worked before.
> I'm happy to do some extra tests or provide additional details, just let
> me know.
> Kind regards,
> Dirk
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