Messages in this thread |  | | Date | Thu, 15 Nov 2001 10:17:51 -0800 (PST) | From | Joel Jaeggli <> | Subject | Re: Linux i/o tweaking |
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I guess the question I'd ask would be what kinda number do you expect from the raid 5 stripe. 107MB/s sounds like a reasonable number from a two channel u160 controller...
my previous best is around 89MB/s with 4 cheetah 15K 18gb drives raid/0
On Thu, 15 Nov 2001, Roy Sigurd Karlsbakk wrote:
> Hi all > > After three days at Compaq's lab in Oslo, testing their medium-level > servers and storage systems with Linux, I've come to some sort of > conclusions, although these may be wrong. I also have come over a few > problems that I couln't find a good solution to. > > * When running RAID from a Compaq Smart 5302/64 controller, software > RAID-5 is (slightly - ~15%) faster (on JBOD - each disk is configured as > a RAID-0 device with max - 256kB - stripe size) than the > hardware/controller based RAID-5. Both CPUs (1266MHz/512kB cache) are > maxed out by reading from software RAID-5 (???), giving me >= 107MB/s on > two SCSI-3 buses with six disks on each bus. > > * Even though I can get up to 25 MB/s from each disk, I can't get more > than 107 MB/s on the whole bunch (12 drives). It doesn't help much to do > RAID-0 either. Don't understand anything ... > > Thanks for all help. > > roy > > -- > Roy Sigurd Karlsbakk, MCSE, MCNE, CLS, LCA > > Computers are like air conditioners. > They stop working when you open Windows. > > > > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ >
-- -------------------------------------------------------------------------- Joel Jaeggli joelja@darkwing.uoregon.edu Academic User Services consult@gladstone.uoregon.edu PGP Key Fingerprint: 1DE9 8FCA 51FB 4195 B42A 9C32 A30D 121E -------------------------------------------------------------------------- It is clear that the arm of criticism cannot replace the criticism of arms. Karl Marx -- Introduction to the critique of Hegel's Philosophy of the right, 1843.
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