[CentOS-virt] Slightly OT: FakeRaid or Software Raid
grantmasterflash at gmail.com
Thu Dec 3 13:09:09 UTC 2009
On Wed, Dec 2, 2009 at 9:48 PM, Christopher G. Stach II <cgs at ldsys.net>wrote:
> ----- "Grant McWilliams" <grantmasterflash at gmail.com> wrote:
> > Interesting thoughts on raid5 although I doubt many would agree.
> That's okay. We all have our off days... Here's some quality reading:
> Maybe you are thinking of RAID 6.
> > I don't see how the drive type has ANYTHING to do with the RAID
> > level.
> IOPS, bit error ratio, bus speed, and spindle speed tend to factor in and
> are usually governed by the drive type. (The BER is very important for how
> often you can expect the data elves come out and chew on your data during
> RAID 5 rebuilds.) You will use those numbers to calculate the number of
> stripe segments, controllers, and disks. Combine that with the controller's
> local bus, number of necessary controllers, host bus, budget, and other
> business requirements and you have a RAID type.
> > a RAID 10 (or 0+1) will never reach the write... performance of
> > a RAID-5.
> (*cough* If you keep the number of disks constant or the amount of usable
> space? "Things working" tends to trump CapEx, despite the associated pain,
> so I will go with "amount of usable space.")
> Christopher G. Stach II
Nice quality reading. I like theories as much as the next person but I'm
wondering if the Toms Hardware guys are on crack or you disapprove of their
Some people, when confronted with a problem, think "I know, I'll use
Now they have two problems.
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