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From: andrei@fazik.net.ua
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Subject: CAM status: Command timeout
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Hello,=0AAfter updating to 11.1 my home server can't boot with errors lik=
e=0A(ada0:ata2:0:0:0): WRITE_DMA48. ACB: 35 00 50 29 10 40 6c 00 0c 00=0A=
(ada0:ata2:0:0:0): CAM status: Command timeout=0A(ada0:ata2:0:0:0): Retry=
ing command=0Afor all 6 sata hdd(stripe from 2 raidz)=0AACB different fro=
m boot to boot=0ASometimes it even can boot, but in few minutes will hang=
 with same errors.=0A=0AHardware: Supermicro X8DTN+-F / 6xWD1502FYPS-02W3=
B0 /2xE5649=0AHDDs connected to sata ports on baseboard.=0AIf I add=0Ahin=
t.ata.2.mode=3DPIO4=0Ahint.ata.3.mode=3DPIO4=0Ahint.ata.4.mode=3DPIO4=0Ah=
int.ata.5.mode=3DPIO4=0Ato device.hints I'm able to boot but performance =
of IO becomes really disappointing.=0AAlso, if I add something like "find=
 / -name something" to zfs rc script, than boots fine.=0A=0AIf I roll bac=
k system to 11.0 all works fine again.=0AAny advise on debuging of this i=
ssue?=0AAlso raised bug report some time ago for this issue=0Ahttps://bug=
s.freebsd.org/bugzilla/show_bug.cgi?id=3D221704