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Date: Thu, 10 Jan 2013 20:55:29 -0700 (MST)
From: Warren Block <wblock@wonkity.com>
To: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
Subject: Re: SATA disk disappears
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On Fri, 11 Jan 2013, Wojciech Puchar wrote:

>
> got this on dell poweredge T110 server with 4 disks, including two 3TB drives 
> (ada2,ada3):
>
> ahcich2: Timeout on slot 8 port 0
> ahcich2: is 00000000 cs 1ffffe00 ss 1fffff00 rs 1fffff00 tfd 40 serr 00000000 
> cmd 0000c817
> ahcich2: AHCI reset: device not ready after 31000ms (tfd = 00000080)
> (ada2:ahcich2:0:0:0): lost device
> GEOM_MIRROR: Request failed (error=6). ada2[WRITE(offset=2997587410944, 
> length=753664)]
> GEOM_MIRROR: Device home1: provider ada2 disconnected.
> (ada2:ahcich2:0:0:0): removing device entry
>
>
>
> did camcontrol reset 2, rescan 2 and ada2 reappeared
> ada2 at ahcich2 bus 0 scbus2 target 0 lun 0
> ada2: <WDC WD30EZRX-00DC0B0 80.00A80> ATA-9 SATA 3.x device
> ada2: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes)
> ada2: Command Queueing enabled
> ada2: 2861588MB (5860533168 512 byte sectors: 16H 63S/T 16383C)
> GEOM_MIRROR: Component ada2 (device home1) broken, skipping.
> GEOM_MIRROR: Cannot add disk ada2 to home1 (error=22).
>
>
> started gmirror rebuild and it now works at full speed.
>
> GEOM_MIRROR: Device home1: rebuilding provider ada2.
>
>
> What kind of hardware failure may it be? smartctl -a /dev/ada2 shows disk is 
> fine.

I had a new WD drive recently that had a write error.  Reallocated 
sector count did not go up, but it quickly failed the SMART self-test, 
short or long.  See smartctl(8) about the -t parameters.