From: Hans van Kranenburg <hans.van.kranenburg@mendix.com>
To: Martin Raiber <martin@urbackup.org>,
"linux-btrfs@vger.kernel.org" <linux-btrfs@vger.kernel.org>
Subject: Re: Multiple btrfs-cleaner threads per volume
Date: Thu, 2 Nov 2017 16:10:35 +0100 [thread overview]
Message-ID: <75dfd17b-3f3a-dc22-e069-d68faa33eb8e@mendix.com> (raw)
In-Reply-To: <0102015f7d418aa6-af3c2ae7-27b0-47d0-a4bb-173f55304bb9-000000@eu-west-1.amazonses.com>
Hi Martin,
On 11/02/2017 04:02 PM, Martin Raiber wrote:
>
> snapshot cleanup is a little slow in my case (50TB volume). Would it
> help to have multiple btrfs-cleaner threads? The block layer underneath
> would have higher throughput with more simultaneous read/write requests.
Just curious:
* How many subvolumes/snapshots are you removing, and what's the
complexity level (like, how many other subvolumes/snapshots reference
the same data extents?)
* Do you see a lot of cpu usage, or mainly a lot of disk I/O? If it's
disk IO, is it mainly random read IO, or is it a lot of write traffic?
* What mount options are you running with (from /proc/mounts)?
--
Hans van Kranenburg
next prev parent reply other threads:[~2017-11-02 15:10 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-02 15:02 Multiple btrfs-cleaner threads per volume Martin Raiber
2017-11-02 15:07 ` Austin S. Hemmelgarn
2017-11-02 15:10 ` Hans van Kranenburg [this message]
2017-11-02 15:26 ` Martin Raiber
2017-11-02 16:56 ` Hans van Kranenburg
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