From: Eric Toombs <ewtoombs@uwaterloo.ca>
To: linux-lvm@redhat.com
Subject: [linux-lvm] faster snapshot creation?
Date: Sat, 22 Feb 2020 06:58:53 -0500 [thread overview]
Message-ID: <d5dd6c06-1e9f-3737-8712-137f92e351cb@uwaterloo.ca> (raw)
Snapshot creation is already pretty fast:
> $ time sudo lvcreate --size 512M --snapshot --name snap /dev/testdbs/template
> Logical volume "snap" created.
> 0.03user 0.05system 0:00.46elapsed 18%CPU (0avgtext+0avgdata 28916maxresident)k
> 768inputs+9828outputs (0major+6315minor)pagefaults 0swaps
That's about half a second in real time. But I have a scenario that
would benefit from it being even faster. I'm doing many small unit tests
starting from a template filesystem. I do the snapshot, run the unit
test on the snapshot, then delete the snapshot afterwards using
lvremove. Each unit test, though, takes much less than a second to run
(often on the order of 10ms), so most of the time is being spent making
these snapshots.
So, is there a sort of "dumber" way of making these snapshots, maybe by
changing the allocation algorithm or something?
next reply other threads:[~2020-02-22 11:58 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-22 11:58 Eric Toombs [this message]
2020-02-25 9:31 ` Gionatan Danti
2020-02-25 9:38 ` Zdenek Kabelac
2020-02-25 21:35 ` Eric Toombs
2020-02-26 10:01 ` Zdenek Kabelac
2020-02-26 14:03 ` Douglas Paul
2020-02-26 0:38 ` Stuart D. Gathman
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=d5dd6c06-1e9f-3737-8712-137f92e351cb@uwaterloo.ca \
--to=ewtoombs@uwaterloo.ca \
--cc=linux-lvm@redhat.com \
--subject='Re: [linux-lvm] faster snapshot creation?' \
/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
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).