http://www.raid-advisory.com/rabguide.html
Great resource for all RAID questions. My personal opinion is the RAID
10 is going to be slower because of double writes for each command.
While 5 writes the info once, the Raid 10 is striped and mirrored,
causing 2 writes and 2 verifies per write. Plus the added cost of
mirrored disks.
Leon Olmschenk Peripheral Technology Group, Inc
Western Region Sales Team
800-875-0068 X 2245
http://www.raidionsystems.com
Manufacturer of the Raidion line of Enterprise Disk Arrays and Digital
Video Storage Systems
-----Original Message-----
From: Chris Price [mailto:[EMAIL PROTECTED]]
Sent: Thursday, June 24, 1999 1:35 PM
To: [EMAIL PROTECTED]
Cc: linuxraid
Subject: Re: Raid 10 experience
Where can I find more info on RAID-10??
My usual linux raid repository (www.linux.org) has a software
raid
mini-howto, but it seems out of date. Can someone point me to a newer
version of the howto or faq (if a newer one exists)?
Thnx
Chris
On Tue, 22 Jun 1999 [EMAIL PROTECTED] wrote:
> On Tue, Jun 22, 1999 at 05:17:33PM +1000, John Leach wrote:
> > Hi.
> > In the Software Raid HOWTO the statistics indicate that Raid-10
while
> > faster than Raid-5 is slower than Raid-0. I'm surprised that this is
the
> > case - does anyone have any other experience with Raid 10 ? If you
have
> > the disk space it sounds like a nice fast option but with
redundancy.
> > I'm keen to try it out if I can borrow a 4-disk system, I'll let the
> > list know...
>
> I think most of the performance degradation I saw with RAID-10, was
due
> to memory bandwidth problems in my machine. There's no way for me to
get
> more than 33 MB/s (or so) from four disks that each do 12 MB/s.
> RAID-10 must copy the same information (RAID-1) to the stripes
(RAID-0),
> so there's obviously a lot of information copying going on.
>
> Perhaps the new ext2/vfs/buffer/cache changes in 2.3.6 will change
this.
> >From what I could understand, the kernel does a lot of unnecessary
copying
> of pages between buffer/cache/etc., and these unnecessary copies have
been
> eliminated in the latest 2.3 kernel. I haven't tested it yet though,
because
> Linus wrote that he released the kernel an hour after he fixed the
last bug
> that ``seemed'' to cause fs corruption, and my benchmarking-box is
also my
> production box :)
> But if anyone feels like playing around with very experimental
kernels, I'm
> sure a lot of people here (and on linux-kernel) would love to hear
about the
> results.
>
> Cheers,
>
> ................................................................
> : [EMAIL PROTECTED] : And I see the elder races, :
> :.........................: putrid forms of man :
> : Jakob �stergaard : See him rise and claim the earth, :
> : OZ9ABN : his downfall is at hand. :
> :.........................:............{Konkhra}...............:
>
