Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Maurits,
I faced this issue some times ago. After a few hours scratching my head, my
eyes stopped by luck on one small line in /var/log/messages among the whole
rest, warning me that my 10Gb Ethernet card was requiring a 8x PCIe slot
when it was in a 4x PCIe slot at that moment, and that might have effects on
performances. After a quick check it turned out to be true, I moved the card
in one of the 8x slots and then got my 10Gb/s throughput sharp.
May be you have this very same problem...
Best regards,
Pascal.
-----Message d'origine-----
De : drbd-user-bounces at lists.linbit.com
[mailto:drbd-user-bounces at lists.linbit.com] De la part de Maurits van de
Lande
Envoyé : mercredi 1 février 2012 13:37
À : 'drbd-user at lists.linbit.com'
Objet : [DRBD-user] drbd 8.3.12 cannot get syncer speed beyond 110MB/s
Hello,
I have asked this question before for drbd 8.4.1 but I couldn't get proper
write performance.
Currently I downgraded drbd to 8.3.12 but I cannot get the syncer speed
above 1Gb/s or 110MB/s.
When I test the disk throughput with
#dd if=/dev/zero of=/VM/test bs=512M count=1 oflag=direct
I get a speed around 500MB/s
(It's an all SSD raid 5 array)
I installed a 10G network adapter and tested the connection with iperf and I
get on average 7Gbit/s
This should all be sufficient for a drbd syncer speed >110MB/s.
I have set the "rate=200M" option for a 2Gbit/s rate
cat /proc/drbd shows
version: 8.3.12 (api:88/proto:86-96)
GIT-hash: e2a8ef4656be026bbae540305fcb998a5991090f build by dag at Build64R6,
2011-11-20 10:57:03
0: cs:SyncSource ro:Primary/Primary ds:UpToDate/Inconsistent C r-----
ns:176 nr:0 dw:0 dr:79839200 al:0 bm:4872 lo:0 pe:0 ua:20 ap:0 ep:1 wo:d
oos:1470943696
[>...................] sync'ed: 5.2% (1436468/1514432)M
finish: 3:30:54 speed: 116,228 (109,212) K/sec
Only at the start the value of (200.000) K/sec is shown.
What can I do to get the 200MB/s syncer speed?
Best regards,
Maurits van de Lande
| Van de Lande BV. | Lissenveld 1 | 4941VK | Raamsdonksveer | the
Netherlands |T +31 (0) 162 516000 | F +31 (0) 162 521417 |
www.vdl-fittings.com |
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