Messages in this thread |  | | | From | Al Boldi <> | | Subject | Re: Eradic disk access during reads | | Date | Sat, 17 Sep 2005 13:32:53 +0300 |
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Willy Tarreau wrote: > On Sat, Sep 17, 2005 at 07:26:11AM +0300, Al Boldi wrote: > > Monitoring disk access using gkrellm, I noticed that a command like > > > > cat /dev/hda > /dev/null > > > > shows eradic disk reads ranging from 0 to 80MB/s on an otherwise idle > > system. > > > > 1. Is this a hardware or software problem? > > Difficult to tell without more info. Can be a broken IDE disk or defective > ribbon.
Tried the same with 2.4.31 which shows steady behaviour with occasional dips and pops in the msec range.
> > > 2. Is there a lightweight perf-mon tool (cmd-line) that would log this > > behaviour graphically? > > You can do " readspeed </dev/hda | tr '\r' '\n' > log " with the readspeed > tool from there : > http://w.ods.org/tools/readspeed
Does it have msec resolution?
Thanks!
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