Messages in this thread | | | Date | Mon, 11 Feb 2002 13:16:57 -0500 (EST) | From | Bill Davidsen <> | Subject | Re: Problem with mke2fs on huge RAID-partition |
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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.
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