The way I do IT, very much inline with Ian approach. I wouldn't care too much about SW RAID or HW RAID, but only because I use a layer of real "application aware" storage tier to interface with the specific applications. [they pay other folks to do the RAID layer]
But this approach is clearly out of your open budgets I guess. So I dunno if this is something you should be thinking about. [before really knowing which app needs what, otherwise this can be counter-effective, no joke] Best, z ----- Original Message ----- From: "Ian Collins" <i...@ianshome.com> To: "Orvar Korvar" <knatte_fnatte_tja...@yahoo.com> Cc: <zfs-discuss@opensolaris.org> Sent: Tuesday, January 13, 2009 4:06 PM Subject: Re: [zfs-discuss] ZFS vs ZFS + HW raid? Which is best? > Orvar Korvar wrote: >> Oh, thanx for your very informative answer. Ive added a link to your >> information in this thread: >> >> But... Sorry, but I wrote wrong. I meant "I will not recommend against HW >> raid + ZFS anymore" instead of "... recommend against HW raid". >> >> The windows people's question is: >> which is better? >> 1. HW raid + ZFS >> 2. ZFS >> >> Ive told them that ZFS prefers to NOT have HW raid. But they ask me why >> they shouldnt use ZFS + HW raid and why they should only use ZFS. >> >> They are using ZFS no matter what. The question is, is ZFS that good, >> that HW raid can be omitted? Does HW raid + ZFS give any gains, compared >> to only ZFS? >> >> It seems that I have to recommend them to keep their HW raid when they >> try out ZFS? Ive gotten them interested in ZFS, enough to try it out. It >> was a lengthy discussion that took much time and patience. >> > As you can see, there isn't a straight answer because there are so many > possibilities. > > One golden rule that might help: Always let ZFS handle the top level > redundancy so it can correct errors. > > Whether you export JBODs from a SAN and build a raidz or export RAID5 > LUNs and build a ZFS mirror what matters is ZFS has redundancy. > > -- > Ian. > > _______________________________________________ > zfs-discuss mailing list > zfs-discuss@opensolaris.org > http://mail.opensolaris.org/mailman/listinfo/zfs-discuss _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
