Date: Tue, 17 Nov 2009 09:28:21 +0000 From: krad <kraduk@googlemail.com> To: Johan Hendriks <Johan@double-l.nl> Cc: freebsd-questions@freebsd.org Subject: Re: ZFS Snaphost & Hardware RAID Message-ID: <d36406630911170128l251c119fi481c4c0396d6f792@mail.gmail.com> In-Reply-To: <57200BF94E69E54880C9BB1AF714BBCBA571DC@w2003s01.double-l.local> References: <4B016384.80604@fxclub.org> <57200BF94E69E54880C9BB1AF714BBCBA571DC@w2003s01.double-l.local>
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2009/11/16 Johan Hendriks <Johan@double-l.nl> > > >Hello all. > > >I plan to set up backup server with 24x1Tb HDD and use ZFS with > >FreeBSD-8.0 on it. > >I prefare to have "ZFS only" system but as I see there is no any easy > >way to do so. > > >I would like to use ZFS snapshots - is I undestand right what snaphots > >work OVER ZFS raidz\storage? So I can`t use hardware RAID and must make > > >a raidz? > > >I would love to head any other suggestion about using FreeBSD with ZFS > >as backup server. > > >-- > >Best regards, > >Proskurin Kirill > > An option is reading this thread on the FreeBSD forums. > > http://forums.freebsd.org/showthread.php?t=3689 > > regards, > Johan Hendriks > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to " > freebsd-questions-unsubscribe@freebsd.org" > zfs works fine with hardware raid controllers, it just means the disk setup can be a little more complicated, and needs to be thought about a bit more. Personally I would JBOD all the drives apart from the system drives which I would create a mirror for. With this setup you utilize all the best features of the hardware and software. System zpool with hardware mirror means you are less likely to get issues booting as bios will see the virtal device exported by the raid card and wont have to alter the boot drive if one of your system drives dies. Just give the system zpool on dev backup zpool: raidz2 ( group into vdevs of 8 drives ). If you export the drives from the hardware raid as a jbod and get zfs to do all the raid stuff, you will enjoy more funky raid configs, and if you have to rebuild a drive it will odds on be much quicker as you only have to do allocated blocks as opposed to full block rebuild of the entire drive as the raid controller would do. Also using the raid card rather than straight scsi you might get benefits from the raid cache, if its cpu is quick enough.
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