Re: Mdadm server eating drives

[Nicolas Jungers <nicolas@jungers.net>]

On 06/27/2013 02:23 AM, Barrett Lewis wrote:
> Everything is going well, I am just trying to replace the parts that
> are on the way out.
> I ran a 'repair' and it came out with 5477 under
> /sys/block/md0/md/mismatch_cnt.  Then a 'check' came out with 0.
>
> Then I went out and bought a couple WD Reds (I'm done with greens now
> that I know they lack ERC).  I replaced one of the two drives Phil
> said was not ok, which had many reallocations (I can personally see
> those) in the smart status.  I then ran another repair to be safe.  It
> came up with 0 mismatches, but in the process /dev/sda started giving
> me tons (and tons and tons, rolled over dmesg) of these "failed
> command: READ FPDMA QUEUED status: { DRDY ERR } error: { UNC }"
> errors. sda hadn't been giving me problems before but I'll come back
> to it.
>
> The second disk Phil said was "not ok" was this one which showed
> "several pending errors".
> (original smart status) http://pastie.org/8040852
> I was going to replace it with my second spare Red, but the errors
> seem to have gone away.
> (current smart status) http://pastie.org/8084278
> Or maybe I am looking in the wrong place to find the pending errors
> (looking at "197 Current_Pending_Sector").  Is the drive currently in
> need of replacement?  I'm not sure what I'm looking for.
>
> What about this one (sda), after it gave all of those errors during a
> repair?  http://pastie.org/8084292
> I get the "5 Reallocated_Sector_Ct", but where do you find pending errors?
>
> What does it mean to get all these "failed command: READ FPDMA QUEUED
> status: { DRDY ERR } error: { UNC }" errors and the smart status seems
> to be fine even after a repair?

Have you considered that your SATA may be faulty? I had consistent bad 
experiences with "cheap" SATA cables. I also use exclusively now cables 
with latches. I said "cheap" because the price is not an absolute 
criteria, quality of sourcing is more important in my experience.

Regards,
N.


>
> Thanks everyone, I'm learning a lot.
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