From: Ram Ramesh <rramesh2400@gmail.com>
To: Brad Campbell <lists2009@fnarfbargle.com>
Cc: linux-raid@vger.kernel.org
Subject: Re: Raid5 to raid6 reshape or recreate?
Date: Wed, 13 Aug 2014 23:10:16 -0500 [thread overview]
Message-ID: <53EC36A8.7090308@gmail.com> (raw)
In-Reply-To: <53EC2D0E.2070402@fnarfbargle.com>
On 08/13/2014 10:29 PM, Brad Campbell wrote:
> On 14/08/14 01:25, Ram Ramesh wrote:
>
>> On a slightly different topic, will it be faster after a disk
>> fail/replacement as opposed to raid reshaping?
>
> Much.
> I just re-striped a RAID6 changing the chunk size from 128k to 64k.
> This took 12 days all up. It's the seeking that kills it. To replace a
> disk or do a resync on the same array takes less than 10 hours.
>
>
>
I am curious. Why do you have to change chunk size? What is the
benefit/advantage?
This seem to confirm the --layout switch Neil Brown talked about. I need
to find that switch. I have one more 3disk-raid5 to 4disk-raid6
reshaping to be done on another machine. I am going to do the --layout
switch and do it in two steps. I suspect it will take about 10 hours
with minimal seek.
Ramesh
next prev parent reply other threads:[~2014-08-14 4:10 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-13 1:05 Raid5 to raid6 reshape or recreate? Ram Ramesh
2014-08-13 9:02 ` Mikael Abrahamsson
2014-08-13 17:25 ` Ram Ramesh
2014-08-14 3:29 ` Brad Campbell
2014-08-14 4:10 ` Ram Ramesh [this message]
2014-08-14 6:06 ` Brad Campbell
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=53EC36A8.7090308@gmail.com \
--to=rramesh2400@gmail.com \
--cc=linux-raid@vger.kernel.org \
--cc=lists2009@fnarfbargle.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 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.