* limits on number of snapshots
@ 2019-02-23 22:10 Ross Boylan
2019-02-23 22:18 ` Hans van Kranenburg
0 siblings, 1 reply; 2+ messages in thread
From: Ross Boylan @ 2019-02-23 22:10 UTC (permalink / raw)
To: linux-btrfs
Various sources (https://btrfs.wiki.kernel.org/index.php/Status,
https://wiki.debian.org/Btrfs) warn that "too many" snapshots,
possibly as few as 12, can degrade performance. OTOH, Marc Merlin's
talk identified snapshots as one of btrfs's killer features. And the
status page https://btrfs.wiki.kernel.org/index.php/Status doesn't
note any performance issues with subvolumes/snaphshots.
As a practical matter, do I need to limit the number of snapshots?
Does it matter what kernel version I'm running? I have a VM running
4.0.9 and am looking to install Debian Buster which is 4.19 at the
moment (4.18 on my first install).
Thanks. I'd appreciate if you'd cc me on replies.
Ross Boylan
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: limits on number of snapshots
2019-02-23 22:10 limits on number of snapshots Ross Boylan
@ 2019-02-23 22:18 ` Hans van Kranenburg
0 siblings, 0 replies; 2+ messages in thread
From: Hans van Kranenburg @ 2019-02-23 22:18 UTC (permalink / raw)
To: Ross Boylan, linux-btrfs
Hi,
On 2/23/19 11:10 PM, Ross Boylan wrote:
> Various sources (https://btrfs.wiki.kernel.org/index.php/Status,
> https://wiki.debian.org/Btrfs) warn that "too many" snapshots,
> possibly as few as 12, can degrade performance. OTOH, Marc Merlin's
> talk identified snapshots as one of btrfs's killer features. And the
> status page https://btrfs.wiki.kernel.org/index.php/Status doesn't
> note any performance issues with subvolumes/snaphshots.
>
> As a practical matter, do I need to limit the number of snapshots?
> Does it matter what kernel version I'm running? I have a VM running
> 4.0.9 and am looking to install Debian Buster which is 4.19 at the
> moment (4.18 on my first install).
"It depends"... Here's an old similar mailing list thread about that:
https://lore.kernel.org/linux-btrfs/314a1441-9390-2e9c-50c0-07e3a6b103a9@mendix.com/
Hans
^ permalink raw reply [flat|nested] 2+ messages in thread
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