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Date: Thu, 18 Oct 2018 20:18:49 -0400
From: "Theodore Y. Ts'o" <tytso@mit.edu>
To: Nathan Peterson <nathan@uwgrads.com>
Cc: linux-ext4@vger.kernel.org
Subject: Re: Unable to mount an ext4 RAID6 array
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Hi,

Sorry I didn't get back to you sooner.  This e-mail thread got lost in
my inbox, so thanks for pinging me about it.

These lines in the logs clearly show that it is a hardware problem.
It could be an issue with the SATA controller, or cables, or even
something in the motherboard.

[  +0.000006] ata1: irq_stat 0x00400040, connection status changed
[  +0.000004] ata1: SError: { HostInt PHYRdyChg 10B8B DevExch }
[  +0.000005] ata1: hard resetting link
[  +5.634542] ata1: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
[  +0.001809] ata1.00: configured for UDMA/133
[  +0.000003] ata1: EH complete
[Sep13 19:47] ata1: exception Emask 0x50 SAct 0x0 SErr 0x4090800

The following article (found via Google) on Serverfault might be
helpful:

https://serverfault.com/questions/749433/hard-resetting-link-exception-emask-0x50-sact-0x0-serr-0x4090800-action-0xe-froz

Good luck,

					- Ted