Help Diagnose Slow Disc Access
Mike McCarty
Mike.McCarty at sbcglobal.net
Mon Mar 1 22:09:33 UTC 2010
Don Quixote de la Mancha wrote:
> All of the hard drive vendors provide disk drive diagnostic tools,
> that are able to access vendor-specific - and undocumented - firmware
> in their drives. This diagnostic firmware is able to diagnose drive
> hardware problems in a much more thorough way than the vendor-neutral
> S.M.A.R.T. is able to.
Ok, AFAICT, the WD diagnostic disc simply used the S.M.A.R.T.
conveyance test, which it aborted. Timing aside, that disc passes
all the tests that smartctl knows about.
SMART Error Log Version: 1
No Errors Logged
SMART Self-test log structure revision number 1
Num Test_Description Status Remaining
LifeTime(hours) LBA_of_first_error
# 1 Conveyance offline Completed without error 00% 12146
-
# 2 Extended offline Completed without error 00% 12107
-
# 3 Short offline Completed without error 00% 12009
-
I've noticed that top often reports 50% or more hi (hardware interrupt)
when the system is slow, and that drive is being hit. I just did a copy
from that disc to another of a 90MB or so ISO and saw 95.4% hi.
This seems to imply that the disc is signalling completion, and the
controller is generating an interrupt, but then the handler is having
to poll for a while before getting the go ahead from the disc. Is
this normal?
Mike
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