Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Hello, On 02/01/2012 01:36 PM, Maurits van de Lande wrote: > 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? You followed all the guidelines in the performance tuning section of the DRBD Users Guide? ... like using jumbo frames on the direct connected 10Gb link and the deadline I/O scheduler, to just name two important ones ... Regards, Andreas -- Need help with DRBD performance tuning? https://www.hastexo.com/services/remote > > 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 | > > > _______________________________________________ > drbd-user mailing list > drbd-user at lists.linbit.com > http://lists.linbit.com/mailman/listinfo/drbd-user -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 222 bytes Desc: OpenPGP digital signature URL: <http://lists.linbit.com/pipermail/drbd-user/attachments/20120201/afb2847b/attachment.pgp>