From: "Peter M. Petrakis" <peter.petrakis@canonical.com>
To: linux-lvm@redhat.com
Subject: Re: [linux-lvm] Does a striped LV honor the order of specified PVs
Date: Fri, 09 Mar 2012 11:40:44 -0500 [thread overview]
Message-ID: <4F5A328C.9060309@canonical.com> (raw)
In-Reply-To: <CANiW5cFpy8a+dYPEXxzb-zjS+jYJH61P=jKKZV_N=tkSneHjmA@mail.gmail.com>
On 03/08/2012 01:41 PM, John Anthony wrote:
> All:
>
> This is situation where the number of LUNS - spindles - are many with the
> LV striping across all of them.
>
> To avoid hotspots - the idea is to control the order in which the LUNs are
> written to by the LVs. It would appear the specifying the underlying PV -
> LUN - order would achieve this goal. Is that correct ? Is there any value
> to going through that trouble ? any experiences ?
Well striping in general is a "good thing" for performance it's just a matter
of how you want to implement it. Yes, LVM can create striped volumes, you could
also create a software RAID array [1] to act as your physical volume and
achieve the same goal. There's copious material available on the topic of RAID
striping.
Peter
1. or buy a HW RAID, or a SAN.
>
> TIA,
>
> -JAC
>
>
>
>
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@redhat.com
> https://www.redhat.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
prev parent reply other threads:[~2012-03-09 16:40 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-08 18:41 [linux-lvm] Does a striped LV honor the order of specified PVs John Anthony
2012-03-09 16:40 ` Peter M. Petrakis [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=4F5A328C.9060309@canonical.com \
--to=peter.petrakis@canonical.com \
--cc=linux-lvm@redhat.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.