Single checksum error - should I be worried ?

[thed00d]

Hi guys,

I've picked up a checksum error on one of my drives in my FreeNAS FreeBSD 8.3-RELEASE-p6 box.

I ran a long smartctl check about two weeks agoand no errors were reported.

I'm running it again now, and will run a scrub aftewards.

Any tips on what I should do if the drive test and scrub completes with out errors again ?


[root@freenas] ~# zpool status
pool: FreeNAS
state: ONLINE
status: One or more devices has experienced an unrecoverable error. An
attempt was made to correct the error. Applications are unaffected.
action: Determine if the device needs to be replaced, and clear the errors
using 'zpool clear' or replace the device with 'zpool replace'.
see: http://www.sun.com/msg/ZFS-8000-9P
scan: scrub canceled on Mon May 6 23:03:59 2013
config:

NAME STATE READ WRITE CKSUM
FreeNAS ONLINE 0 0 0
raidz1-0 ONLINE 0 0 0
gptid/cb7be29d-a945-11e2-8102-00005a11c112 ONLINE 0 0 0
gptid/32793470-b5a5-11e2-b4cf-00005a11c112 ONLINE 0 0 0
gptid/cd5cb1ab-a945-11e2-8102-00005a11c112 ONLINE 0 0 1
gptid/ce33a33c-a945-11e2-8102-00005a11c112 ONLINE 0 0 0

errors: No known data errors

 

[jgreco]

Thank ZFS for protecting your data, of course. The whole theory with ZFS is that sometimes, somewhere, somehow, for various reasons, things rot, and that better technology can protect you.

A single error is not cause for panic. Multiple errors would be a sign to "look harder" at things. If you have another error next month, again, "look harder" at things. But the one random unexplained error is the ideal ZFS protection case.

 

[thed00d]

Thanks for the reply.

I'll let the tests run and check the results.

Is it possible for me to move the drive to a different slot ? ie. swap it with another slot (while the server is powered off of course)

I'm not sure if it matters to FreeNAS the actual location of the drive.

Thank ZFS for protecting your data, of course. The whole theory with ZFS is that sometimes, somewhere, somehow, for various reasons, things rot, and that better technology can protect you.

A single error is not cause for panic. Multiple errors would be a sign to "look harder" at things. If you have another error next month, again, "look harder" at things. But the one random unexplained error is the ideal ZFS protection case.

 

[jgreco]

Yes, you can move the drive, as long as you're just moving it between standard SATA ports.