I am in the process of implementing a fairly large mysql server for an even larger company, and naturally i want to use FreeBSD. The hardware will be an HP DL385, 2 x dual-core Opterons, 16GB RAM, 7 x 15k rpm disks in a RAID5 setup. I'm not exactly informed as to the specific workload yet, however i know the database will have several million rows and be larger than 10GB.So, first of all, am i crazy for choosing fbsd+mysql for this rather than something like Solaris + Oracle? :) Secondly, i am just looking for some suggestions, opinions, success/failure story's that may help me out. Is anyone out there using FreeBSD for something of this size? I am hoping that everything will work out well, and the client will be happy. This would generate some good PR for FreeBSD, as it is a very large international company and it would be the first FreeBSD server (that i know of) of this type there.
I'm managing a 28 GB postgresql (7.4.9) database running on FreeBSD 6.0 (release). The server is a quad-core opteron with 8 GB ram. The database has many smaller tables and one large with 47+ million entries and the activity is mainly inserts. The most important settings I tweaked was: shared_buffers = 32768 vacuum_mem = 262144 max_fsm_pages = 1250000 max_fsm_relations = 1000 effective_cache_size = 65536 random_page_cost = 2 These settings are for pg 7.4. If you go for postgresql you want 8.1. If you go for FreeBSD remembere to change these settings in the kernel: options SHMMAXPGS=393216 options SEMMNI=240 options SEMMNS=1440 options SEMUME=240 options SEMMNU=720 The command 'ipcs -ma' on FreeBSD will tell you SEGSZ (size in bytes) of the shared memory postgres is using. Our's is 299573248 bytes and you can adjust shared_buffers according to this. I found the information at http://www.varlena.com/GeneralBits/Tidbits/perf.html. regards Claus _______________________________________________ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "[EMAIL PROTECTED]"
