Date: Thu, 25 Jan 2007 13:50:51 -0800 From: "Jeff Mohler" <speedtoys.racing@gmail.com> To: "Milo Hyson" <milo@cyberlifelabs.com> Cc: freebsd-questions@freebsd.org Subject: Re: RAID Performance Questions Message-ID: <a969fbd10701251350w7da17c9ew3f3a21b654ea1910@mail.gmail.com> In-Reply-To: <8A3D6CC2-5BB8-4A3F-9D72-C37383186C34@cyberlifelabs.com> References: <25E0702D-C3A3-4B6B-BC56-D1BC5C1347F5@cyberlifelabs.com> <0C1E63BE-0E2B-4ABC-952C-3EDC95CF8D8A@mac.com> <8A3D6CC2-5BB8-4A3F-9D72-C37383186C34@cyberlifelabs.com>
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How about one large raid, and two partitions to serve each purpose? Being so limited in HW, youre either going to take a _huuuuuge_ performance hit with only 2 disks per raid (unless Raid0), or an availability hit with everything on one RAID set. But..considering the costs of adding RAID to a server..take a peek here for a high(er) perfomance RAID solution..if Fbsd had an iscsi layer like linux has had for...5yrs or so..this would be a slam dunk as you can still serve it as block data. If that cant help you, it might help the next guy with only a few K's to spend on large disks and raid controllers. On 1/25/07, Milo Hyson <milo@cyberlifelabs.com> wrote: > On Jan 25, 2007, at 12:15, Chuck Swiger wrote: > > > Still, you also ought to consider that a 3-disk RAID-5 > > configuration is very much not ideal from either an efficiency or > > performance standpoint-- you want more like 5 or 6 drives being > > used, in which case your performance numbers ought to increase > > some. This is also somewhat true of the 4-disk RAID-10 config; > > using 6 or all 8 drives would likely improve performance compared > > with striping against only two disks. > > Unfortunately, I'm a bit limited in terms of equipment and > application requirements. For starters, the app specs currently call > for two arrays: one for general file-serving and databases, and the > other for backups. Due to limited hardware I'm to run both on the > same controller. Far from ideal, I know, but it's what I have. > Second, I need to keep at least one drive as a hot-spare. Thus, I > have seven drives that I somehow need to partition into two groups > and maximize performance without sacrificing reliability. Lastly, the > RAID controller does not permit more than two drives in a RAID-1 set. > > Any suggestions? > > -- > Milo Hyson > CyberLife Labs > _______________________________________________ > 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" >
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