Messages in this thread | | | Date | Sat, 03 Mar 2001 10:57:08 +1100 | From | Andrew Morton <> | Subject | Re: I/O problem with sustained writes |
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Collectively Unconscious wrote: > > We are having a problem with writes. > They start at 14 M/s for the first hour and then drop to 2.5 M/s and stay > that way. Reads do not seem effected and we've noticed this on the 2.2.16, > 2.2.17, 2.2.18 and now the 2.2.19pre11 kernels. > > These are SMP P-IIIs from 450 to 800 MHz. Redhat 6.2
I've seen something similar on Seagate ST313021A IDE drives. After a few minutes their read throughput falls from 20 megs/sec to about 5. Issuing *any* drive-setting command brings the throughput back. Even a command which the disk doesn't support.
So I have a cron job which runs `hdparm -A1' once per minute.
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