30.01.2013 1:01, Warren Block:
On Tue, 29 Jan 2013, Artem Kuchin wrote:
29.01.2013 18:57, Warren Block:
On Tue, 29 Jan 2013, Artem Kuchin wrote:
The Handbook chapter on gmirror talks about the problems with GPT
and GEOM metadata. In short: right now, they conflict. It's
possible to mirror GPT partitions, but be aware that if you mirror
more than one partition on a drive, a rebuild after replacing a
drive could thrash the heads as mirrors are rebuilt simultaneously.
http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/geom-mirror.html
So,
gmirror+GPT=conflict on last sector
GPT+gmirror = hardrive head kill
nice...
So, for no more than 2TB disks the best way to go is GMIRROR of the
drive +PARTITION on top of it?
GPT partitions should work, just limit it to one mirrored partition
per drive.
Please, clarify what you mean here.
Or maybe there is a way to instruct gmirror do rebuild only what i
say (manual rebuild) ?
'gmirror configure -n' ? Have not tried it. The trick would be to do
that before multiple mirrors start rebuilding, which they will as soon
as geom_mirror.ko is loaded.
As i understand from the man page -n setup the device not to auto
rebuild ever. So, this is probably the thing i want. I need to setup a
test system and play with it
a bit.
Artem
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