Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
/ 2007-01-29 10:30:52 +0100 \ H.D.: > Hello, > > I'd like replicate a DBMS (PostgreSQL) under heavy OLTP workload with protocol C. By heavy I mean > 1500 > transactions per second, which results in at least as many fsyncs. > > I've used DRBD a while, but in way smaller setups, where performance was secondary. > > The hardware I'm planing to run this on has not been delivered yet, so I can't just test it. My question now is > whether (trunked) gigabit ethernet can delivery the short round trip times required for this application at all > and if DRBD can use other transports such as Infiniband? DRBD is happy to use any IPv4 based network you give it. (or probably v6, but I think our config tools do not support the v6 syntax yet) also note that rtt in LAN is usually orders of magnitude less than average seek time/fsync time of storage. also in a dedicated fo for over 20km, rtt might be in the order of one digit ms, iirc. drbd8 should give some improvements regarding latency, too. -- : 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.