[DRBD-user] Please help with slow Replication / Syncing on debian squeeze 6.0, 8-disk RAID6

Jake Smith jsmith at argotec.com
Mon Mar 12 17:13:27 CET 2012


----- Original Message -----
> From: "Uwe Schuerkamp" <uwe.schuerkamp at nionex.net>
> To: "Michael Schwartzkopff" <misch at schwartzkopff.org>, drbd-user at lists.linbit.com
> Sent: Monday, March 12, 2012 9:57:29 AM
> Subject: Re: [DRBD-user] Please help with slow Replication / Syncing on	debian squeeze 6.0, 8-disk RAID6
> 
> On Mon, Mar 12, 2012 at 02:28:42PM +0100, Michael Schwartzkopff
> wrote:
> > > On Mon, Mar 12, 2012 at 01:25:12PM +0100, Michael Schwartzkopff
> > > wrote:
> > > > Hm,
> > > > 
> > > > somethings do not fit together. You configured a rate of 102M
> > > > (Byte/s)
> > > > and when you ask the DRBD it tells you that your configured a
> > > > rate of
> > > > 11M (Byte/s)
> > > > 
> > > > Did your show us the /proc/drbd output of the above given
> > > > config?
> > > 
> > > Hello Michael,
> > > 
> > > here's the /proc/drbd output:
> > > 
> > > # cat /proc/drbd
> > > version: 8.3.7 (api:88/proto:86-91)
> > > srcversion: EE47D8BF18AC166BE219757
> > >  0: cs:SyncSource ro:Primary/Secondary ds:UpToDate/Inconsistent C
> > >  r----
> > >     ns:2371132 nr:0 dw:0 dr:2378656 al:0 bm:144 lo:1 pe:2556
> > >     ua:1806
> > >     ap:0 ep:1 wo:d oos:3152530292
> > >         [>....................] sync'ed:  0.1% (3078640/3080948)M
> > >         finish: 59:10:08 speed: 14,628 (12,296) K/sec
> > 
> > What about
> > drbdsetup /dev/drbd... show?
> > 
> > --
> 
> Hello Michael,
> 
> I think I included this one with the first email, here's the current
> setup:
> 
> # drbdsetup /dev/drbd0 show
> disk {
>         size                    0s _is_default; # bytes
>         on-io-error             pass_on _is_default;
>         fencing                 dont-care _is_default;
>         no-disk-barrier ;
>         no-disk-flushes ;
>         no-md-flushes   ;
>         max-bio-bvecs           0 _is_default;
> }
> net {
>         timeout                 60 _is_default; # 1/10 seconds
>         max-epoch-size          2048 _is_default;
>         max-buffers             2048 _is_default;
>         unplug-watermark        128 _is_default;
>         connect-int             10 _is_default; # seconds
>         ping-int                10 _is_default; # seconds
>         sndbuf-size             0 _is_default; # bytes
>         rcvbuf-size             0 _is_default; # bytes
>         ko-count                0 _is_default;
>         cram-hmac-alg           "sha1";
>         shared-secret           "XXXXXXXXXXXXXXXXXXXX";

Does the rate change at all if you remove the cram-hmac-alg and shared-secret?

>         after-sb-0pri           disconnect _is_default;
>         after-sb-1pri           disconnect _is_default;
>         after-sb-2pri           disconnect _is_default;
>         rr-conflict             disconnect _is_default;
>         ping-timeout            5 _is_default; # 1/10 seconds
> }
> syncer {
>         rate                    92160k; # bytes/second

Have you tried adjusting the syncer rate (temporarily) on the fly and see if it changes? i.e.:
drbdsetup /dev/drbd0 syncer -r 110M
drbdadm adjust 0

HTH
Jake

>         after                   -1 _is_default;
>         al-extents              127 _is_default;
> }
> protocol C;
> _this_host {
>         device                  minor 0;
>         disk                    "/dev/vg00/lvol0";
>         meta-disk               internal;
>         address                 ipv4 192.168.168.200:7788;
> }
> _remote_host {
>         address                 ipv4 192.168.168.210:7788;
> }




More information about the drbd-user mailing list