Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Am Montag, 12. September 2005 17:09 schrieb Barry Price: > Hi, > > We're looking at DRBD as a way to get a live-backup going on our database > server. It's an 8cpu SCSI-fired RAID1+0 monster with 16Gb RAM, and it's > usually very, very busy. > > The database server is PostgreSQL 8, and consists of over 10,000 tables > with up to 2,000 connections, processing several hundred queries per > second. DRBD looks like exactly what we need, but the testimonials I've > seen have all been on rather smaller systems. > > Has anyone stress-tested DRBD on this level of system? I'm concerned that > even over gigabit, it simply won't be able to keep up with the speed of > writes that we get over the SCSI controllers. What happens when a backlog > occurs? Does the secondary machine simply queue the changes, or can it > lock up? Are there any other issues we should be concerned about? > Hi Barry, Two of the more interesting clusters we run at Linbit PostgreSQL on a quad Opteron / 8 GB RAM Cluster Oracle on a quad HyperThreading enabled Xeons (=8 virtual CPUs) with 8GB RAM Cluster. Regarding Performance, look for the "Need for speed" subject in the mailing list archives. Ask your self: Can my SCSI controllers / disks write more than 100MByte/second ? That is what GBit Ethernet delivers you. If the secondary machine can not keep up with the writing speed of the primary it will slow-down the primary in the end. => The machines should have about the same performance. -Philipp -- : Dipl-Ing Philipp Reisner Tel +43-1-8178292-50 : : LINBIT Information Technologies GmbH Fax +43-1-8178292-82 : : Schönbrunnerstr 244, 1120 Vienna, Austria http://www.linbit.com :