From: Ray Morris <support@bettercgi.com>
To: linux-lvm@redhat.com
Subject: Re: [linux-lvm] calculating size of metadata.
Date: Tue, 24 Apr 2012 09:52:52 -0500 [thread overview]
Message-ID: <20120424095252.15fdcb07@bettercgi.com> (raw)
In-Reply-To: <4F969B43.2080504@ki.tng.de>
It's good think about this because running out of metadata space is no
fun. We use 181KB for about 300 LVs, where each snapshot is counted as
two LVs because of the way it's stored. That's based on the size of the
backup. vgs shows 8 MB of metadata used, though:
# vgs --units k -o vg_mda_count,vg_mda_free,vg_mda_size clones
vgs #VMda VMdaFree VMdaSize
vgs 3 7973.50k 16444.00k
In any event, on a 19,950,000 MB partition, even 64 MB of metadata
would represent 0.0006% of the storage. To think of it another way, 64
MB costs roughly 0.03 cents, so allocate plenty.
--
Ray Morris
support@bettercgi.com
Strongbox - The next generation in site security:
http://www.bettercgi.com/strongbox/
Throttlebox - Intelligent Bandwidth Control
http://www.bettercgi.com/throttlebox/
Strongbox / Throttlebox affiliate program:
http://www.bettercgi.com/affiliates/user/register.php
On Tue, 24 Apr 2012 14:23:31 +0200
Jan-Hendrik Palic <billgotchy@ki.tng.de> wrote:
> Hi there,
>
> we planning to create a pv and vg on a 19,95TB partition running on
> raid6. One issue I have is the size of the metadata. I am looking for
> a way to calculate the this size, but unfortunatly, I cannot find a
> some. Which size should I use?
>
> Thanks in advance.
>
> Jan
>
> _______________________________________________
> 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/
>
next prev parent reply other threads:[~2012-04-24 14:52 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-24 12:23 [linux-lvm] calculating size of metadata Jan-Hendrik Palic
2012-04-24 12:49 ` Lars Ellenberg
2012-04-24 14:52 ` Ray Morris [this message]
2012-04-24 15:19 ` Jan-Hendrik Palic
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=20120424095252.15fdcb07@bettercgi.com \
--to=support@bettercgi.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.