[DRBD-user] syncer performance problem

Lars Ellenberg Lars.Ellenberg at linbit.com
Fri Jul 30 23:29:30 CEST 2004

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


/ 2004-07-30 16:34:32 -0400
\ Tim Tregubov:
> Heya -
> 
> Same problem here!
> 
> With a 3ware SATA Raid  with 7 Maxtor 7Y250M0 drives.
> 
> With scp rates are about 25MB/s  (from machine1 raid to machine2 
> raid(without drbd))
> with netcat up to 30MB.  (from file on machine1 raid to file on 
> machine2 raid(without drbd))
> 
> Bonnie shows good performance on the HD's themselves.
> 
> 
> BUT:
> 
> [root at topdog root]# cat /proc/drbd
> version: 0.7.0 svn $Rev: 1438 $ (api:74/proto:74)
> 
>  0: cs:SyncSource st:Secondary/Secondary ld:Consistent
>     ns:268888 nr:0 dw:0 dr:272000 al:0 bm:16 lo:0 pe:563 ua:778 ap:0
>         [===================>] sync'ed: 99.9% (1058590/1058850)M
>         finish: 68:26:02 speed: 4,396 (4,937) K/sec

if you use anything before this revision:

| r1451 | lars | 2004-07-23 16:18:42 +0200 (Fri, 23 Jul 2004) | 1 line
| Changed paths:
|    M /trunk/drbd/drbd_proc.c
| 
| fix integer overflow in progress bar

(and you do: 0.7.0 tgz is 1438 or 1439)

it may just deisplay the wrong value...
please verify that by a grep in syslog:
 grep -E "Resync (started|done)" /tmp/2004-07-*/screenlog.1
and do the calculation yourself, based on the timestamp and the amount
announced on start.

just an idea...



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