From: Ming Zhang <mingz@ele.uri.edu>
To: Andy Smith <andy@lug.org.uk>
Cc: linux-raid@vger.kernel.org
Subject: Re: mdadm + raid1 of 2 disks and now need to add more
Date: Tue, 11 Apr 2006 18:13:02 -0400 [thread overview]
Message-ID: <1144793582.26235.196.camel@localhost.localdomain> (raw)
In-Reply-To: <20060411203216.GV29446@strugglers.net>
On Tue, 2006-04-11 at 20:32 +0000, Andy Smith wrote:
> On Tue, Apr 11, 2006 at 07:25:58PM +0200, Laurent CARON wrote:
> > Andy Smith wrote:
> > >On Tue, Apr 11, 2006 at 04:41:30PM +0200, Shai wrote:
> > >>I have two SCSI disks on raid1.
> > >>Since I have lots of reads from that raid, I want to add two more
> > >>disks to this raid so that read will be faster.
> > >>
> > >>How should I add the new disks?
> > >
> > >Is this possible with md currently:
> > >
> > >Create a RAID-10 on the two new disks specifying one disk missing
> > >from each mirror.
> > >
> > >Then copy data over and add the two existing disks letting it
> > >resync?
> >
> > Why not growing the array with 2 more disks?
>
> Well I guess a RAID-1 of 4 disks would be slightly more redundant
> than a 4 disk RAID-10, but it would have half the capacity, and the
> read performance would be very similar, no?
raid1 of 4 will give u read performance like 1 disk;
raid10 of 4 can give u read performance like aggregated 2 disks.
>
next prev parent reply other threads:[~2006-04-11 22:13 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-04-11 14:41 mdadm + raid1 of 2 disks and now need to add more Shai
2006-04-11 14:51 ` Andy Smith
2006-04-11 17:25 ` Laurent CARON
2006-04-11 20:32 ` Andy Smith
2006-04-11 22:13 ` Ming Zhang [this message]
2006-04-12 2:07 ` Guy
2006-04-12 13:22 ` Ming Zhang
2006-04-12 7:18 ` Shai
2006-04-12 8:16 ` Neil Brown
2006-04-12 9:10 ` Shai
2006-04-16 23:36 ` Neil Brown
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=1144793582.26235.196.camel@localhost.localdomain \
--to=mingz@ele.uri.edu \
--cc=andy@lug.org.uk \
--cc=linux-raid@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).