On Mon, Aug 4, 2008 at 10:04 PM, <david@xxxxxxx> wrote: > On Mon, 4 Aug 2008, Mark Wong wrote: > >> Hi all, >> >> We've thrown together some results from simple i/o tests on Linux >> comparing various file systems, hardware and software raid with a >> little bit of volume management: >> >> http://wiki.postgresql.org/wiki/HP_ProLiant_DL380_G5_Tuning_Guide >> >> What I'd like to ask of the folks on the list is how relevant is this >> information in helping make decisions such as "What file system should >> I use?" "What performance can I expect from this RAID configuration?" >> I know these kind of tests won't help answer questions like "Which >> file system is most reliable?" but we would like to be as helpful as >> we can. >> >> Any suggestions/comments/criticisms for what would be more relevant or >> interesting also appreciated. We've started with Linux but we'd also >> like to hit some other OS's. I'm assuming FreeBSD would be the other >> popular choice for the DL-380 that we're using. >> >> I hope this is helpful. > > it's definantly timely for me (we were having a spirited 'discussion' on > this topic at work today ;-) > > what happened with XFS? Not exactly sure, I didn't attempt to debug much. I only looked into it enough to see that the fio processes were waiting for something. In one case I left the test go for 24 hours too see if it would stop. Note that I specified to fio not to run longer than an hour. > you show it as not completing half the tests in the single-disk table and > it's completly missing from the other ones. > > what OS/kernel were you running? This is a Gentoo system, running the 2.6.25-gentoo-r6 kernel. > if it was linux, which software raid did you try (md or dm) did you use lvm > or raw partitions? We tried mdraid, not device-mapper. So far we have only used raw partitions (whole devices without partitions.) Regards, Mark
