Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Dont have a way to setup blksize of drbd? I have the following in the messages log: Sep 23 13:38:51 SRVSYB01 kernel: drbd0: blksize=512 B Sep 23 13:39:01 SRVSYB01 kernel: drbd1: blksize=512 B Sep 23 13:39:07 SRVSYB01 kernel: drbd2: blksize=512 B Sep 23 13:39:07 SRVSYB01 kernel: drbd3: blksize=512 B Drbd defining block size to 512 B and database use block size of 2K. I would like to set drbd block size to 2k too. De:drbd-user-bounces at lists.linbit.com Para:drbd-user at lists.linbit.com Cópia: Data:Thu, 23 Sep 2004 14:47:02 +0200 Assunto:Re: [DRBD-user] drbd tranfer limitations (random and sequential acccess) using raw > crsurf schrieb: > > >Hello list > >I´m using drbd in a Gigabit network (crossover cable) and when I synchronize data (sequential read/write) the tranfer hit to 30~40 Mb/s, but when I make inserts into database (random read/write) that access drbd device via raw, the transfer rate hit only 5~6 Mb/s. Exists some way to improve this performance? > >I increased the sndbuf-size to 256K, but no such effect. I increase interface MTU to 9000 and no such effect too. > >One database process that run in 4 min. without replication, run in 30 min. with replication. > >Now I´m trying using filesystem jfs instead raw to view if the performance will be improved. > >Maybe sync-nice can help us? > > > > > I think drbd is not the right thing for databases with small block-sizes (my INFORMIX uses 2048 bytes, see separate thread here). My SybaseSQL-Anywhere is running very fast on drbd-replicated-ext3-filesystem. I dont know if you use ASE, but you should try using larger block-sizes (if supported). > > I got an test-prog from an informix-consultant wich runs on local disk in 7 seconds. It takes 8 minutes on drbd-replicated-ext3-filesystem. I am looking forward for an solution... > > Best regards > > Thomas > > _______________________________________________ > drbd-user mailing list > drbd-user at lists.linbit.com > http://lists.linbit.com/mailman/listinfo/drbd-user > > Esta mensagem foi verificada pelo E-mail Protegido Terra. > Scan engine: VirusScan / Atualizado em 22/09/2004 / Versão: 1.5.2 > Proteja o seu e-mail Terra: http://www.emailprotegido.terra.com.br/ > > E-mail classificado pelo Identificador de Spam Inteligente Terra. > Para alterar a categoria classificada, visite > http://www.terra.com.br/centralunificada/emailprotegido/imail/imail.cgi?+_u=crsurf&_l=1,1095945432.383963.19875.conventos.terra.com.br,4715,Des15,Des15 > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.linbit.com/pipermail/drbd-user/attachments/20040923/b8ce2b29/attachment.htm>