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, o
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 wors
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 I/O
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
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 snapsh
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 th
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