Re: raid/device failure

[Thomas Fjellstrom <thomas@fjellstrom.ca>]

On February 10, 2013, Brad Campbell wrote:
> On 11/02/13 09:27, Thomas Fjellstrom wrote:
> > sd 0:0:7:0: [sdh]  Add. Sense: Information unit iuCRC error detected
> 
> The CRC error there is the key. Check your cables, backplane & PSU.
> 

Very good to know. Thank you. :) Google had hinted the same thing. I've gone 
into the machine and made sure everything was snug, just in case it was a lose 
cable or connection on the backplane.

I've --add'ed the drive back to the array. I think that should make a simple 
test to see if anything reallocates. After that, I'll try some more read and 
mixed read-write tests to see if the error's going to pop up again, but so far 
after a few hours, not even a single warning*.

Should the problem come back, I'll follow up with a power test, then some 
cable tests. Since it seemed that it was always erroring out on the same drive 
(not 100% sure, but it seems like it), and if its not likely a drive problem, 
it may be one SFF-8087 breakout cable, then swapping the cables should change 
which drive it happens to, if it does I should know its the cable.

* except for this: "[ 1052.626900] The scan_unevictable_pages sysctl/node-
interface has been disabled for lack of a legitimate use case.  If you have 
one, please send an email to linux-mm@kvack.org." and I have absolutely no 
idea what caused that at this point and time. Also don't think its applicable.


-- 
Thomas Fjellstrom
thomas@fjellstrom.ca