> -----Original Message-----
> From: arch-general [mailto:arch-general-boun...@archlinux.org] On Behalf
> Of niya levi via arch-general
> Sent: Thursday, January 12, 2017 9:22 PM
> To: arch-general@archlinux.org
> Cc: niya levi <niyal...@gmail.com>
> Subject: [arch-general] btrfs raid 10 fileserver with ata errors
> hi everyone
> i have a fileserver with 6 1tb disks
> i get the following errors repeated constantly
> ----------------------------------------------------------------------------------------------
> --------
> ata17.00 exception Emask 0x0 Sact 0x0 SErr 0x0 action 0x6 frozen
> failed command: READ DMA
> cmd c8/00:30:       tag 14 dma 65536 in
> res 40/00:ff:00       Emask 0x4 (timeout)
> status {DRDY}
> ----------------------------------------------------------------------------------------------
> ------------
> after some googling it's been suggested that it's either a hard drive,
> the sata controller or the sata cables.
> how do i go about diagnosing and fixing the problem,
> any suggestions or guidance would be appreciated.
> shadrock

I've had this problem before. IIRC, you can match up the ata17.00 with what 
drive it's talking about by looking at your kernel boot messages. The first 
thing I would do is switch out the SATA cable and see if the problem persists. 
If that doesn't work, run a scan of the drive using the manufacturers scan 

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