From: "H. Peter Anvin" <hpa@zytor.com>
To: Goswin von Brederlow <goswin-v-b@web.de>
Cc: Nifty Fedora Mitch <niftyfedora@niftyegg.com>,
linux-raid@vger.kernel.org
Subject: Re: Why do I need 4 disks for a raid6?
Date: Wed, 01 Apr 2009 09:09:57 -0700 [thread overview]
Message-ID: <49D391D5.1050509@zytor.com> (raw)
In-Reply-To: <87ljquemy3.fsf@frosties.localdomain>
Goswin von Brederlow wrote:
>
> Actually the definition I read was that raid6 is like raid5 but
> allowing for 2 or more disks to fail without loss. So a 15 disks raid
> with 10 data blocks and 5 parity blocks per stripe would also be raid6.
>
2 or more *arbitrary* disks. You can't, say, have two RAID-5s and call
the combination a RAID-6, because they're not all there.
-hpa
--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.
prev parent reply other threads:[~2009-04-01 16:09 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-17 19:12 Why do I need 4 disks for a raid6? Goswin von Brederlow
2009-03-18 3:41 ` david.geib
2009-03-18 9:50 ` Goswin von Brederlow
2009-03-18 18:12 ` david.geib
2009-03-18 12:18 ` Andre Noll
[not found] ` <49C0EA5F.9070901@vshift.com>
2009-03-18 12:35 ` Andre Noll
2009-03-18 14:08 ` Goswin von Brederlow
2009-03-18 14:26 ` Robin Hill
2009-03-18 18:48 ` Goswin von Brederlow
2009-04-01 16:08 ` H. Peter Anvin
2009-04-01 17:47 ` Andre Noll
2009-04-01 20:36 ` H. Peter Anvin
2009-04-01 18:07 ` Goswin von Brederlow
2009-04-01 19:05 ` H. Peter Anvin
2009-03-19 23:35 ` Neil Brown
2009-03-20 10:20 ` Goswin von Brederlow
2009-03-23 20:20 ` Nifty Fedora Mitch
2009-03-24 19:32 ` Goswin von Brederlow
2009-04-01 16:09 ` H. Peter Anvin [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=49D391D5.1050509@zytor.com \
--to=hpa@zytor.com \
--cc=goswin-v-b@web.de \
--cc=linux-raid@vger.kernel.org \
--cc=niftyfedora@niftyegg.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).