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List:       drbd-user
Subject:    Re: [DRBD-user] drbd storage size
From:       Arnold Krille <arnold () arnoldarts ! de>
Date:       2014-10-24 21:24:29
Message-ID: 20141024232429.60c23d30 () xingu ! arnoldarts ! de
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On Fri, 24 Oct 2014 19:03:13 +0000 "Meij, Henk" <hmeij@wesleyan.edu>
wrote:
> Thanks Artnold, been all over that page for 8.4 ... I have
> c-max-rate=100M and resync-rate=100M (for all resources). The "want"
> is ok but the actual speeds never total more than say 40M, it's like
> stuck on some 30% threshold. Yet rsync is able to consume 122M
> nic-to-nic.  I just can not get drbd to exercise the disks.
> 
> -Henk
> 
>  1: cs:SyncTarget ro:Secondary/Primary ds:Inconsistent/UpToDate C
> r----- ns:0 nr:30411544 dw:30411544 dr:0 al:0 bm:0 lo:0 pe:0 ua:0
> ap:0 ep:1 wo:f oos:27312503072 [>....................] sync'ed:  0.2%
> (26672364/26702064)M finish: 657:07:29 speed: 11,540 (12,760) want:
> 112,640 K/sec 2: cs:SyncTarget ro:Secondary/Primary
> ds:Inconsistent/UpToDate C r----- ns:0 nr:26457880 dw:26457880 dr:0
> al:0 bm:0 lo:0 pe:0 ua:0 ap:0 ep:1 wo:f oos:27316457760
> [>....................] sync'ed:  0.1% (26676228/26702064)M finish:
> 822:58:59 speed: 9,212 (11,104) want: 112,640 K/sec 3: cs:SyncTarget
> ro:Secondary/Primary ds:Inconsistent/UpToDate C r----- ns:0
> nr:14164288 dw:14164288 dr:0 al:0 bm:0 lo:0 pe:40 ua:0 ap:0 ep:1 wo:f
> oos:27328751352 [>....................] sync'ed:  0.1%
> (26688232/26702064)M finish: 747:25:58 speed: 10,148 (5,948) want:
> 112,640 K/sec 4: cs:SyncTarget ro:Secondary/Primary
> ds:Inconsistent/UpToDate C r----- ns:0 nr:20091672 dw:20091672 dr:0
> al:0 bm:0 lo:0 pe:0 ua:0 ap:0 ep:1 wo:f oos:27328979044
> [>....................] sync'ed:  0.1% (26688456/26708076)M finish:
> 672:59:41 speed: 11,260 (8,432) want: 110,160 K/sec

Surely they are not all reading / writing on the same disc? For
drbd-volumes residing on the same physical disc there is the option to
sync one after another to reduce seeks.

- Arnold

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