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List:       freebsd-virtualization
Subject:    AHCI SATA controller timeouts
From:       Paul Esson <Paul.Esson () Redstor ! com>
Date:       2018-11-21 17:40:19
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
t  +44 (0)118 951 5235  |   m  +44 (0)776 690 6514
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