rc.d script for memory based zfs intent log

[Hiroki Sato]

John <jwd at freebsd.org> wrote
  in <20130109023327.GA1888 at FreeBSD.org>:

jw> Hi Folks,
jw>
jw>    Here's an rc.d script that provides a nice performance boost on
jw> ZFS/NFS based file servers. It also helps in other areas not specific
jw> to NFS.
jw>
jw>    It attaches the log device at system startup and removes it at
jw> system shutdown time. Example;
jw>
jw> memzil_pools="tank"
jw> memzil_bootfs="YES"
jw> service memzil onestart
jw> zpool status tank
jw> service memzil onestop
jw>
jw>    This configuration provides a nice performance boost especially to
jw> NFS, but also helps in other areas not specific to NFS.
jw>
jw>    Please DO NOT USE this script if your system is not UPS backed, preferably
jw> with dual power supplies on separate circuits. If your system crashes you
jw> may lose data. The script contains information on recovery.
jw>
jw> http://people.freebsd.org/~jwd/memzil.txt
jw>
jw>    Comments/Improvements appreciated.

 Why is simply setting sync=disabled to the ZFS dataset not enough?

-- Hiroki
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