Warren Young wrote:
Rudi Ahlers wrote:
So, how does it perform with 6 discs for example? Say I have 3 HDD's
in RAID-0, and another 3 in RAID-0, then RAID-1 the 2 RAID-0 stripes.
There's actually two kinds of RAID-10. Some like to say RAID-01 or
RAID-1+0 or things like that to distinguish them. It's a matter of
whether it's mirrors over stripes or stripes over mirrors. You're
talking about mirrors over stripes, but I'm talking about doing it the
other way around.
Your way has the advantage of letting you add disks in pairs, but to
get that you get only single-disk redundancy: if a second disk goes
out, your array is gone, no matter which disk it is.
If you do it the other way, you have to use groups of 4 (two mirrors
striped together) but you get the advantage that with a single disk
missing, you can lose another if it's in the other mirror. Of course,
if you lose two in the same mirror, you're toast.
And what would you recommend on 8 / 10 HDD's?
As I said, usually RAID-5 or -6 usually makes more sense with so many
spindles. If you're talking RAID-10 (my way) with so many disks, it
starts getting expensive with 8, 12, etc.
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Ok, so it stripping a mirror more redundant then, from what you say?
But, it's limited to pairs of 4 HDD's, which means a bigger chassis, and
a mobo / PCI controller that can support 8 HDD's if I want to add more?
But, if I want to use 6+ drives, rather use RAID 6? How does RAID-6
perform in relation to RAID-5 or RAID-10 (RAID-01)?
--
Kind Regards
Rudi Ahlers
CEO, SoftDux
Web: http://www.SoftDux.com
Check out my technical blog, http://blog.softdux.com for Linux or other technical stuff, or visit http://www.WebHostingTalk.co.za for Web Hosting stuff
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