On 27/10/2010 11:09 PM, Leslie S Satenstein wrote:
Here is my experience, and hope you have collaboration or comments.
When I started to use the 300gig drive, it was empty, and things worked
at usb2 speed.
As the drive reached the 250gig level, activity to the drive started to
slow to a snail's pace.
Now at the 275 gig level, writing to the drive stalls for minutes on
end. I tried different things such as issuing a sync command to empty
the cache. I can tell that the drive light came on for a few megabytes
of transfer, and then a long long wait to complete the write. I was
sending a 350meg file to the drive.
I read elsewhere about the journal file created to support ext4 being
the cause of the slowdown. Anyone else experience this problem.
The same drive on a CENTOS system which knows ext3 as the latest file
structure shows no abnormal slowdown.
Is it possible that it is the schedular that tries to be fair? I tried
to renice the writing, and that changed the priority of the task, but
did not remedy the problem.
Frustrating to not be able to figure out where the jamming is occurring.
*------------------
*
Regards
*
Leslie
*
*Mr. Leslie Satenstein
*
<mailto:[email protected]>
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Have you tried running strace on your cp to see where it's stalling?
Finding out the call it's sticking on may point you in the write direction.
I agree that if everything fine under ext3 but chokes under ext4, then
you are looking at an ext4 "feature" that is not playing well with others.
David
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