From: "H. Peter Anvin" <hpa@zytor.com>
To: Neil Brown <neilb@suse.de>
Cc: Jan Engelhardt <jengelh@linux01.gwdg.de>, linux-raid@vger.kernel.org
Subject: Re: Reshaping raid0/10
Date: Mon, 28 May 2007 21:51:16 -0700 [thread overview]
Message-ID: <465BB144.2060003@zytor.com> (raw)
In-Reply-To: <17908.33911.135761.236374@notabene.brown>
Back in March, Neil Brown wrote:
>
> Well.... it's not straight forward at all.
>
> Firstly: it can only work if all your drives are the same size
> (rounded to 64K). If they aren't raid0 will use all the available
> space on each drive, while raid5 will only use the amount that is
> available on the first drive.
>
> If that condition is met, then you can safely convert to a raid4 with
> one extra (missing) device by simply creating an array with the same
> drives (so you have to stop and restart the array - you cannot do that
> bit while the array is live). You seem to need --assume-clean
> to create the raid4 degraded... That is probably a bug in mdadm.
>
[rest of procedure deleted]
I just wanted to let you know we performed this procedure on
mirrors1.kernel.org. It was successful, and saved us from copying 3 TB
of data across the Internet.
-hpa
prev parent reply other threads:[~2007-05-29 4:51 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-02-21 16:28 Reshaping raid0/10 Jan Engelhardt
2007-02-21 19:59 ` Neil Brown
2007-02-22 6:09 ` dean gaudet
2007-02-23 12:59 ` Jan Engelhardt
2007-02-23 20:17 ` Neil Brown
2007-03-10 20:21 ` H. Peter Anvin
2007-03-10 21:19 ` Jan Engelhardt
2007-03-11 22:36 ` Neil Brown
2007-05-29 4:51 ` 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=465BB144.2060003@zytor.com \
--to=hpa@zytor.com \
--cc=jengelh@linux01.gwdg.de \
--cc=linux-raid@vger.kernel.org \
--cc=neilb@suse.de \
/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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.