Date: Mon, 13 Jul 2009 22:58:53 +0200 From: FBSD UG <freebsd@rgbaz.eu> To: Maxim Khitrov <mkhitrov@gmail.com> Cc: Free BSD Questions list <freebsd-questions@freebsd.org>, mahlerrd@yahoo.com Subject: Re: ZFS or UFS for 4TB hardware RAID6? Message-ID: <E2D4E433-E30B-4A41-8156-8B2F08033CAC@rgbaz.eu> In-Reply-To: <26ddd1750907131223k9e20142n1fbc41e16d82bf87@mail.gmail.com> References: <937260.17107.qm@web51002.mail.re2.yahoo.com> <26ddd1750907131223k9e20142n1fbc41e16d82bf87@mail.gmail.com>
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> >> A bit of reading shows that ZFS, if it's stable enough, has some >> really great features that would be nice on such a large pile o' >> drives. >> >> See http://wiki.freebsd.org/ZFSQuickStartGuide >> >> I guess the last question I'll ask (as any more may uncover my >> ignorance) is if you need to use hardware RAID at all? It seems >> both UFS2 and ZFS can do software RAID which seems to be quite >> reasonable with respect to performance and in many ways seems to be >> more robust since it is a bit more portable (no specialized >> hardware). > > I've thought about this one a lot. In my case, the hard drives are in > a separate enclosure from the server and the two had to be connected > via SAS cables. The 9690SA-8E card was the best choice I could find > for accessing an external SAS enclosure with support for 8 drives. > > I could configure it in JBOD mode and then use software to create a > RAID array. In fact, I will likely do this to compare performance of a > hardware vs. software RAID5 solution. The ZFS RAID-Z option does not > appeal to me, because the read performance does not benefit from > additional drives, and I don't think RAID6 is available in software. > For those reasons I'm leaning toward a hardware implementation. > Hi Maxim, RAID-Z2 is the RAID6 double parity option in ZFS. gr Arno
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