28.01.2013 08:05, Michael Sierchio:
On Sun, Jan 27, 2013 at 5:36 PM, Shane Ambler <free...@shaneware.biz> wrote:
I recall reading that using partitions for zfs on FreeBSD was as good as
full disks.
No, it isn't - ZFS can fully utilize disk caches when presented with
whole devices. There are possible reasons to create partitions - one
being that if an unfriendly OS sees the device, it won't try to
initialize it if it sees a partition map. Another is using a cheap
RAID controller that can't be fully disabled - in which case you
generally need to create a partition that doesn't include the last few
sectors of the disk, where such controllers keep magic data.
That's wrong for long ago. This problem was solaris specific. Current
ZFS code sees no difference between disks and partitions. One should
think twice when putting two vdevs on one physical disk though.
--
Sphinx of black quartz, judge my vow.
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