[DRBD-user] sync rate only 2,204 (1,220) K/sec?

Milind Dumbare milind at linsyssoft.com
Wed Oct 4 16:19:59 CEST 2006


On Wed, 2006-10-04 at 16:09 +0200, Peter Sabaini wrote:
> Hello list,
> 
> I experimented with drbd a bit; on my first sync it says this in /proc/drbd:
> 
> # cat /proc/drbd
> version: 0.7.20 (api:79/proto:74)
> SVN Revision: 2260 build by debuild at build64-dapper, 2006-07-20 16:42:44
>  0: cs:SyncSource st:Secondary/Secondary ld:Consistent
>     ns:3214256 nr:0 dw:0 dr:3219148 al:0 bm:196 lo:0 pe:182 ua:1223 ap:0
>         [=>..................] sync'ed:  5.7% (52205/55344)M
>         finish: 6:11:14 speed: 2,204 (1,220) K/sec
> 
> This seems extremely slow -- Hardware is 2xHP DL385 on a Procurve Switch with 
> Gigabit connection between them.
> 
> The syncer rate in drbd.conf is set to 50M, Protocoll is "C"
> 
> dstat gives me:
> 
> # dstat 1
> ----total-cpu-usage---- -disk/total -net/total- ---paging-- ---system--
> usr sys idl wai hiq siq|_read write|_recv _send|__in_ _out_|_int_ _csw_
>   0   1   8  90   0   0|   0     0 |   0     0 |   0     0 |1109  1449
>   0   0   0 100   0   0|   0     0 |2880k  161k|   0     0 |1249  1554
>   0   1   0  98   0   1|   0     0 |2990k  135k|   0     0 |1144  1410
>   0   0   0 100   0   0|   0     0 |3004k  152k|   0     0 |1177  1343
>   0   0   0 100   0   0|   0     0 |2893k  148k|   0     0 |1161  1391
>   0   0   0 100   0   0|   0     0 |2852k  150k|   0     0 |1197  1451
>   0   0   0  99   0   0|   0     0 |5915k  306k|   0     0 |2400  2842
> 
> 
> Usually, I can push 110MB/sec over the wire via NFS.
> 
> Am I missing something? Is it only the initial sync thats slow? 
> 
Do you have fast i/o backend? See "$hdparm -t <underlying io device>.
> Thanks for any pointers!
> peter.
> 
> 
> 
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> 
-- 
Milind
"The world is divided into one group: those who start counting at 0,
and those who don't."




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