On 2018-02-10 12:24, Tomasz Pala wrote:
> There is a serious flaw in btrfs subcommands handling. Since all of them
> are handled by single 'btrfs' binary, there is no way to create any
> protection against accidental data loss for (the only one I've found,
> but still DANGEROUS) 'btrfs subvolume
On 02/11/2018 04:59 PM, Ellis H. Wilson III wrote:
> Thanks Tomasz,
>
> Comments in-line:
>
> On 02/10/2018 05:05 PM, Tomasz Pala wrote:
>> You won't have anything close to "accurate" in btrfs - quotas don't
>> include space wasted by fragmentation, which happens to allocate from
>> tens
>> to
On 02/11/2018 05:15 PM, Ellis H. Wilson III wrote:
> Thanks Hans. Sorry for the top-post, but I'm boiling things down here
> so I don't have a clear line-item to respond to. The take-aways I see
> here to my original queries are:
>
> 1. Nobody has done a thorough analysis of the impact of
On Sun, Feb 11, 2018 at 12:31:42PM +0300, Andrei Borzenkov wrote:
> 11.02.2018 04:02, Hans van Kranenburg пишет:
> >> - /dev/sda6 / btrfs
> >> rw,relatime,ssd,space_cache,subvolid=259,subvol=/@/.snapshots/1/snapshot
> >> 0 0
> >
> > Note that changes on atime cause writes to metadata, which means
Thanks Hans. Sorry for the top-post, but I'm boiling things down here
so I don't have a clear line-item to respond to. The take-aways I see
here to my original queries are:
1. Nobody has done a thorough analysis of the impact of snapshot
manipulation WITHOUT qgroups enabled on foreground
Thanks Tomasz,
Comments in-line:
On 02/10/2018 05:05 PM, Tomasz Pala wrote:
You won't have anything close to "accurate" in btrfs - quotas don't
include space wasted by fragmentation, which happens to allocate from tens
to thousands times (sic!) more space than the files itself.
Not in some
11.02.2018 04:02, Hans van Kranenburg пишет:
...
>
>> - /dev/sda6 / btrfs
>> rw,relatime,ssd,space_cache,subvolid=259,subvol=/@/.snapshots/1/snapshot
>> 0 0
>
> Note that changes on atime cause writes to metadata, which means cowing
> metadata blocks and unsharing them from a previous snapshot,
