[DRBD-user] drbd sync poor performance

Papp Tamás tompos at martos.bme.hu
Thu Apr 3 17:12:10 CEST 2008

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


Papp Tamás wrote:
> Papp Tamás wrote:
>> Dear All,
>>
>> What could cause this poor performance?
>>
>> # cat /proc/drbd
>> version: 8.0.11 (api:86/proto:86)
>> GIT-hash: b3fe2bdfd3b9f7c2f923186883eb9e2a0d3a5b1b build by 
>> root at gl4.cube.intra, 2008-03-11 12:31:09
>> 0: cs:SyncTarget st:Secondary/Secondary ds:Inconsistent/UpToDate C r---
>>    ns:0 nr:1147776 dw:1147360 dr:0 al:0 bm:69 lo:14 pe:0 ua:13 ap:0
>>        [>....................] sync'ed:  0.9% (138538/139658)M
>>        finish: 4:16:59 speed: 9,152 (8,960) K/sec
>>        resync: used:1/31 hits:71652 misses:71 starving:0 dirty:0 
>> changed:71
>>        act_log: used:0/257 hits:0 misses:0 starving:0 dirty:0 changed:0
>> 1: cs:SyncTarget st:Secondary/Secondary ds:Inconsistent/UpToDate C r---
>>    ns:0 nr:1147904 dw:1143808 dr:0 al:0 bm:69 lo:128 pe:0 ua:128 ap:0
>>        [>....................] sync'ed:  0.9% (138477/139594)M
>>        finish: 4:28:33 speed: 8,772 (8,936) K/sec
>>        resync: used:2/31 hits:71545 misses:71 starving:0 dirty:0 
>> changed:71
>>        act_log: used:0/257 hits:0 misses:0 starving:0 dirty:0 changed:0
>>
>>
>> I set up the syncer rate to 100M.
>
> Sorry, I missed some details.
>
> This is an initial sync, with strong IO controllers on the two side 
> (Adaptec 2420S).
>
> Thank you,

Well, I'm a bit stupid, actually it's 8MB/s, not 8.7KB/s.

I apologize everybody.

tamas



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