On Sat, 9 Feb 2002, Francois Romieu wrote:
> Raid1 is software only.
> As soon as a filesystem on the promise adapter comes into play, writes maxes
> out at 2,5Mo/s. The previous machine (old PA2012 motherboard) with 8 times
> less memory was able to stand 4~5Mo/s with vanilla broken kernel.
> Now it's running 2.4.18-pre3-ac2 but the behavior is the same with vanilla
> pre, vanilla + akpm ll, +ide patches. Feel free to ask if you want a test on a
> specific version. I have dedicated a partition on each disk for testing.
I don't have a fix for this directly, but the slow speed can be fixed on
many Promise controllers with hdparm. Testing the transfer rate of some of
my mature (ATA/66) drives, I find that raising the transfer rate from 3MB
to 14MB is often possible after setting the options.
NOTE: wrong options will hose your data! WHich is why I don't tell you
what to use, just look at -m -c (I use 3), -d and -X34. Again, it may bite
you, have backups.
-- bill davidsen <davidsen@tmr.com> CTO, TMR Associates, Inc Doing interesting things with little computers since 1979.- 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/
This archive was generated by hypermail 2b29 : Fri Feb 15 2002 - 21:00:41 EST