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Date:      Wed, 21 Nov 2018 17:40:19 +0000
From:      Paul Esson <Paul.Esson@Redstor.com>
To:        "freebsd-virtualization@freebsd.org" <freebsd-virtualization@freebsd.org>
Subject:   AHCI SATA controller timeouts 
Message-ID:  <DB6P190MB0166894CA33EBC9B95780CA89EDA0@DB6P190MB0166.EURP190.PROD.OUTLOOK.COM>
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Hi Folks,

I have a bhyve FreeBSD guest 11.2-RELEASE running on a FreeBSD host 11.2-RELEASE that is experiencing issues with a zvol presented from the host as a BHYVE SATA DISK and used by the guest to create a zpool.  I used the ahci-hd block driver because it supported TRIM and I did not have the virtio-scsi driver available.

Anyway, I have this configuration running on a number of Dell PowerEdge R730xd servers without issue, but we recently purchased a next generation R740xd model and suddenly when I am generating lots of writes to the guest zpool via a zfs send/receive I see the following timeout messages causing the i/o to terminate.

I've noted some online conversation around examples in a physical hardware context but not virtual and wondered if anyone had seen anything similar?

Nov 20 10:54:45 dc2-olbp-sn-15b kernel: ahcich6: Timeout on slot 14 port 0
Nov 20 10:54:52 dc2-olbp-sn-15b kernel: ahcich6: is 00000008 cs 00000000 ss 00000000 rs 00006000 tfd 50 serr 00000000 cmd 0001ce17
Nov 20 10:54:52 dc2-olbp-sn-15b kernel: (ada0:ahcich6:0:0:0): SEND_FPDMA_QUEUED DATA SET MANAGEMENT. ACB: 64 01 00 00 00 40 00 00 00 00 00 00
Nov 20 10:54:52 dc2-olbp-sn-15b kernel: (ada0:ahcich6:0:0:0): CAM status: Command timeout
Nov 20 10:54:52 dc2-olbp-sn-15b kernel: (ada0:ahcich6:0:0:0): Retrying command
Nov 21 15:12:09 dc2-olbp-sn-15b kernel: ahcich6: Timeout on slot 24 port 0
Nov 21 15:12:09 dc2-olbp-sn-15b kernel: ahcich6: is 00000000 cs 00000000 ss 03000000 rs 03000000 tfd 50 serr 00000000 cmd 0001d917
Nov 21 15:12:09 dc2-olbp-sn-15b kernel: (ada0:ahcich6:0:0:0): WRITE_FPDMA_QUEUED. ACB: 61 00 b0 50 b5 40 22 00 00 01 00 00
Nov 21 15:12:09 dc2-olbp-sn-15b kernel: (ada0:ahcich6:0:0:0): CAM status: Command timeout
Nov 21 15:12:09 dc2-olbp-sn-15b kernel: (ada0:ahcich6:0:0:0): Retrying command

Regards,

Paul Esson  |  Redstor Limited
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