On Wed, Jun 20, 2007 at 01:45:29PM +0200, Oliver Schinagl wrote: > > > Pawel Jakub Dawidek wrote: > > On Tue, Jun 19, 2007 at 07:52:28PM -0700, Richard Elling wrote: > > > >>> On that note, i have a different first question to start with. I > >>> personally am a Linux fanboy, and would love to see/use ZFS on linux. I > >>> assume that I can use those ZFS disks later with any os that can > >>> work/recognizes ZFS correct? e.g. I can install/setup ZFS in FBSD, and > >>> later use it in OpenSolaris/Linux Fuse(native) later? > >>> > >> The on-disk format is an available specification and is designed to be > >> platform neutral. We certainly hope you will be able to access the > >> zpools from different OSes (one at a time). > >> > > > > Will be nice to not EFI label disks, though:) Currently there is a > > problem with this - zpool created on Solaris is not recognized by > > FreeBSD, because FreeBSD claims GPT label is corrupted. On the other > > hand, creating ZFS on FreeBSD (on a raw disk) can be used under Solaris. > > > > > > I read this earlier, that it's recommended to use a whole disk instead > of a partition with zfs, the thing that's holding me back however is the > mixture of different sized disks I have. I suppose if I had a 300gb per > disk raid-z going on 3 300 disk and one 320gb disk, but only have a > partition of 300gb on it (still with me), i could later expand that > partition with fdisk and the entire raid-z would then expand to 320gb > per disk (assuming the other disks magically gain 20gb, so this is a bad > example in that sense :) ) > > Also what about full disk vs full partition, e.g. make 1 partition to > span the entire disk vs using the entire disk. > Is there any significant performance penalty? (So not having a disk > split into 2 partitions, but 1 disk, 1 partition) I read that with a > full raw disk zfs will be beter to utilize the disks write cache, but I > don't see how.
On FreeBSD (thanks to GEOM) there is no difference what do you have under ZFS. On Solaris, ZFS turns on write cache on disk when whole disk is used. On FreeBSD write cache is enabled by default and GEOM consumers can send write-cache-flush (BIO_FLUSH) request to any GEOM providers. -- Pawel Jakub Dawidek http://www.wheel.pl [EMAIL PROTECTED] http://www.FreeBSD.org FreeBSD committer Am I Evil? Yes, I Am!
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