Re: RAID6 data-check took almost 2 hours, clicking sounds, system unresponsive

[NeilBrown <neilb@suse.de>]

On Wed, 13 Apr 2011 15:24:17 -0700 (PDT) Gavin Flower <gavinflower@yahoo.com>
wrote:

> 
> --- On Fri, 8/4/11, Gavin Flower <gavinflower@yahoo.com> wrote:
> 
> > From: Gavin Flower <gavinflower@yahoo.com>
> > Subject: RAID6 data-check took almost 2 hours, clicking sounds, system unresponsive
> [...]
> > This morning, I noticed my system was extremely
> > unresponsive, and that there were clicking sounds coming
> > from one of my 5 hard drives.  
> [...]
> 
> Hi Neil,
> 
> When I do 
>    badblocks -s -v /dev/sdc
> I hear clicking sounds from the hard drive, and notice lots and lots of log messages such as:
> ata3: exception Emask 0x10 SAct 0x0 SErr 0x90200 action 0xe frozen
> ata3: irq_stat 0x00400000, PHY RDY changed
> ata3: SError: { Persist PHYRdyChg 10B8B }
> ata3: hard resetting link
> ata3: softreset failed (device not ready)
> ata3: applying SB600 PMP SRST workaround and retrying
> ata3: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
> ata3.00: configured for UDMA/33
> ata3: EH complete
> 
> So I assume that the clicking corresponds to the hard reset, but I'm not certain of that.  Initially, I thought it might be some kind of disk head problems.  Note that smart reports no bad blocks.
> 
> 
> Regards,
> Gavin
> 

This completely out side of my area of expertise.

My approach to such issues is to replace bits until the issue goes away, and
the last bit I replaced goes in the bin (after suitable double-checks) or
back to the supplier.

NeilBrown
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