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How to treat and how to clear disk errors?

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edwards willeam
How to treat and how to clear disk errors?
on Dec 4, 2009 at 1:50:50 am


I'm getting lot of clear disk error alerts on my storage.The alert says"non-zero error counters on the
NMV".will it going to be affect the drives and is their is production
impact. any proactive things to recover these errors.please help to
clear this errors.

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irrani dam
Re: How to treat and how to clear disk errors?
on Dec 5, 2009 at 1:39:15 am


Try the following solution it may work. You may be got an email
notification from the appliance showing error
counters on a given volume/disk.. Or maybe, you opened appliance's
inbox (NMC 'show inbox') and noticed the same.. Or maybe, you noticed
non-zero error counters on the NMV (web GUI) volumes page, or simply
'show volume [volume-name] status' command. In all of those cases,
please note the following:

* If the volume is not in a FAULTED or UNAVAILABLE state, the errors
are recoverable. In other words, ZFS has enough information to (a)
notice the read/write/checksum error, and (b) circumvent it by
presenting the user with the correct data.
* Non-zero read, write, or checksum error counters may indicate that
the corresponding device need to be replaced, sooner or later. If the
device produces a fault two times in a row, say, in the period of two
weeks - statistically, there is a much higher probability that it'll
produce another fault during the next week of operation, compared to
device that has never failed so far. This accumulating risk needs to
be addressed.
To clear the device from recoverable faults, use NMC 'clear-errors'
This brings another question, of how to find NMC commands if you do
not remember them exactly. The answer is - easy. Simply run:
nmc$ help keyword clear
nmc$ help keyword error
The result in both of those cases will be (*):
* setup volume [volume-name] clear-errors


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