[Bug 241980] panic: I/O to pool appears to be hung on vdev

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=241980

--- Comment #26 from Eugene Grosbein <eugen at freebsd.org> ---
At first this hardware used mfi(4) driver that has no TRIM support at all and
write performance was very bad. Switch to mrsas(4) with re-trimming SSDs
one-by-one made performance normal. Disabling TRIM is not an option.

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