From: Sebastian Riemer <sebastian.riemer@profitbricks.com>
To: LVM general discussion and development <linux-lvm@redhat.com>
Subject: Re: [linux-lvm] Allocation Policy for Cloud Computing needed
Date: Tue, 21 Feb 2012 10:48:51 +0100 [thread overview]
Message-ID: <4F436883.3090106@profitbricks.com> (raw)
In-Reply-To: <20120220164151.0c7f1b7a@bettercgi.com>
On 20/02/12 23:41, Ray Morris wrote:
> Since you're using RAID anyway, consider testing RAID 10, which will
> distribute IO across spindles.
I've already tested RAID-10 with MD as well as letting LVM do the
striping. This is total equal: There are too many IO processes on all
spindles for good performance. All r/w-heads in RAID-10 have to be
repositioned over and over again.
Even in random IO this only reads from a single spindle per RAID-1 array.
Without striping MD RAID-1 has a good read balancing algorithm. With
that I can read from both spindles in the RAID-1 array simultaneously.
> For scripting, see Linux::LVM on CPAN. It gives you that information
> as a nice data structure. I welcome feature requests and patches.
> (Linux::LVM::Do coming soon for modifying rather than just querying
> LVM objects.)
Thanks, I'll look at that.
Cheers,
Sebastian
next prev parent reply other threads:[~2012-02-21 9:48 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-16 13:50 [linux-lvm] Allocation Policy for Cloud Computing needed Sebastian Riemer
2012-02-16 14:41 ` James Hawtin
2012-02-16 15:27 ` Sebastian Riemer
2012-02-20 21:59 ` Lars Ellenberg
2012-02-20 22:41 ` Ray Morris
2012-02-21 9:48 ` Sebastian Riemer [this message]
2012-02-21 9:34 ` Sebastian Riemer
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