Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
On Fri, Aug 24, 2007 at 06:18:29AM -0700, Maila wrote: > > Hello. you have to subscribe to be allowed to post to this list. > We have made some performance tests with DRBD and Postgresql 8.2.3. We have > two identical servers in a cluster (Dell 2950) with a partition of 100 GB > managed by DRBD: once we checked Postgres keeping his data folder in a local > partition, the second time we moved the data folder in the shared partition. > The partition is mounted with the option noatime in order to not update the > inode access time in case of read access. > We used pgbench for the testings, creating a dabase of about 3GB with a > scale of 200. After we perfomed 10 tests for each configuration, simulating > the usage of 100 clients with 500 transactions each. please first tune for "sequential write", before you try to tune for any particular application. there is a very short section about drbd performance tuning in http://www.drbd.org/fileadmin/drbd/publications/drbd8.linux-conf.eu.2007.pdf if that does not help, subscribe, post again, and do not forget to tell us about network characteristics, especially latency, e.g. do some flood pings with different packet sizes. -- : Lars Ellenberg Tel +43-1-8178292-0 : : LINBIT Information Technologies GmbH Fax +43-1-8178292-82 : : Vivenotgasse 48, A-1120 Vienna/Europe http://www.linbit.com : __ please use the "List-Reply" function of your email client.