There are times when we may fail a drive, since it stops responding, but
never-the-less are able to reset the controller and bring it back on
line. While this won't always allow a fix, certain controllers have been
observed to enter a state where they stop replying so badly we fail
them, only to have them recover later with a reset (sometimes with
manual intervention prior to the reset to send a vendor specific FTL
reset command). Allowing reset to be tried in these cases allows us to
avoid a reboot.
Sponsored by: Netflix