[Bug 229745] ahcich: CAM status: Command timeout

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=229745

--- Comment #47 from sec <szczepan at szczepan.net> ---
(In reply to Warner Losh from comment #46)

Hi,
>From my expierence:
1) I didn't have this issue until I've updated to 11.2 IIRC (that was almost
one year ago)
2) First I replaced my drives to new ones - issue was still there
3) Then I bought new PSU - issue was still there
4) Power cycle was solving the issue until load was put on drives
5) After adding 'vfs.zfs.cache_flush_disable=1' and doing power cycle issue was
fixed - no more timeout in almost year time now
6) I'm prettry sure the old PSU and drives were OK - old PSU is working in
another machine without issues, drives were RMA'ed so can't tell

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