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Old 12-03-2012, 09:43 PM   #1
jlinkels
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Cache failure on otherwise perfect disk?


I have a Shuttle XV-35 with a 2.5" 320 GB hard disk. The computer became very, very slow. About 50% wait states in top. Disk light almost always on. Like it was swapping all the time. Memory use less that 50% of physical memory so swapping out of the question.

When booting the machine from a live USB stick, I think I saw a message flashing by which said that cache on /dev/sda was not available.

I had checked all log files, but no indication of a problem. Checked the disk with SMART, not a single error was reported. Checking the file system did not reveal any errors. Summarizing: no errors reported, ever.

I replaced the hard disk. Cloned the old disk. Access of the old disk was normal: no delay in copying while the system was booted from a live USB.

Placed the new hard disk, and all slowness had disappeared.

My only conclusion is that there had been a problem with the disk. But no errors reported. Is that possible. Could it have been a non-working cache? Would that not be reported by S.M.A.R.T.?

jlinkels
 
Old 12-04-2012, 02:59 AM   #2
H_TeXMeX_H
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Well, run a SMART long test (not short or others) if you haven't already and post the attributes 'smartctl -A /dev/sda'.
 
Old 12-04-2012, 08:54 PM   #3
jlinkels
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Cool, wish I had read the complete help of smartctl and not just followed the directions I found somewhere in a forum.

I have to mount the disk back and test. Time permitting I will do so and report back. For the sake of research.

Thanks

jlinkels
 
Old 12-05-2012, 09:35 AM   #4
H_TeXMeX_H
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You run:

Code:
smartctl -t long /dev/sda
where 'sda' is the device node. Then you wait for it to finish, and you run 'smartctl -a /dev/sda'.
 
  


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