From: "H. Peter Anvin" <hpa@zytor.com>
To: linux-btrfs <linux-btrfs@vger.kernel.org>
Subject: Feature request: true RAID-1 mode
Date: Wed, 20 Jun 2012 09:27:16 -0700 [thread overview]
Message-ID: <4FE1F9E4.5090301@zytor.com> (raw)
Yet another boot loader support request.
Right now btrfs' definition of "RAID-1" with more than two devices is a
bit unorthodox: it stores on any two drives. "True RAID-1" would
instead store N copies on each of N devices, the same way an actual
RAID-1 would operate with an arbitrary number of devices.
This means that a bootloader can consider a single device in isolation:
if the firmware gives access only to a single device, it can be booted.
Since /boot is usually a very small amount of data, this is a very
reasonable tradeoff.
-hpa
--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.
next reply other threads:[~2012-06-20 16:27 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-20 16:27 H. Peter Anvin [this message]
2012-06-21 0:35 ` Feature request: true RAID-1 mode Marios Titas
2012-06-21 0:50 ` Chris Mason
2012-06-21 1:34 ` H. Peter Anvin
2012-06-25 15:21 ` Chris Mason
2012-06-25 17:46 ` H. Peter Anvin
2012-06-25 22:34 ` Gareth Pye
[not found] ` <CA+WRLO87LvTrRJRMNwYQ3SwmZWF7WzO_FDi1=jqt1kwX=YSnWQ@mail.gmail.com>
2012-06-25 22:37 ` H. Peter Anvin
2012-06-25 22:46 ` Gareth Pye
2012-06-25 22:54 ` Hugo Mills
2012-06-25 23:00 ` H. Peter Anvin
2012-07-02 15:59 ` H. Peter Anvin
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=4FE1F9E4.5090301@zytor.com \
--to=hpa@zytor.com \
--cc=linux-btrfs@vger.kernel.org \
/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).