Space used by snapshot

Space used by snapshot

[Roman Kapusta]

Hello all,

Is there any way how to obtain information how much space is
physically allocated by given subvolume?
I cannot find any. I'm interested in two values:

- physical space allocated by SUBVOLUME INCLUDING all space shared by
other subvolumes

- physical space allocated by SUBVOLUME EXCLUDING all space shared by
other subvolumes

Currently I can use only du, which is not reporting what I want to know.

Regards

Roman Kapusta

Re: Space used by snapshot

[Hugo Mills]

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On Thu, Feb 17, 2011 at 12:13:53PM +0100, Roman Kapusta wrote:
> Hello all,
> 
> Is there any way how to obtain information how much space is
> physically allocated by given subvolume?
> I cannot find any. I'm interested in two values:
> 
> - physical space allocated by SUBVOLUME INCLUDING all space shared by
> other subvolumes
> 
> - physical space allocated by SUBVOLUME EXCLUDING all space shared by
> other subvolumes
> 
> Currently I can use only du, which is not reporting what I want to know.

   Not at the moment. It shouldn't be too difficult to implement
(certainly to implement the latter), but it's just not been done yet.

   Hugo.

-- 
=== Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk ===
  PGP key: 515C238D from wwwkeys.eu.pgp.net or http://www.carfax.org.uk
  --- What do you give the man who has everything? -- Penicillin is ---  
                             a good start...                             

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Re: Space used by snapshot

[Hubert Kario]

On Thursday, February 17, 2011 12:13:53 Roman Kapusta wrote:
> Hello all,
>=20
> Is there any way how to obtain information how much space is
> physically allocated by given subvolume?
> I cannot find any. I'm interested in two values:
>=20
> - physical space allocated by SUBVOLUME INCLUDING all space shared by
> other subvolumes

That's the space reported by `du -hs /mnt/btrfs/subvolume`

>=20
> - physical space allocated by SUBVOLUME EXCLUDING all space shared by
> other subvolumes

That's not implemented right now
=20
> Currently I can use only du, which is not reporting what I want to kn=
ow.
>=20
> Regards
>=20
> Roman Kapusta

--=20
Hubert Kario
QBS - Quality Business Software
02-656 Warszawa, ul. Ksawer=C3=B3w 30/85
tel. +48 (22) 646-61-51, 646-74-24
www.qbs.com.pl
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Re: Space used by snapshot

[Roman Kapusta]

On Thu, Feb 17, 2011 at 12:54, Hubert Kario <hka@qbs.com.pl> wrote:
> On Thursday, February 17, 2011 12:13:53 Roman Kapusta wrote:
>> Hello all,
>>
>> Is there any way how to obtain information how much space is
>> physically allocated by given subvolume?
>> I cannot find any. I'm interested in two values:
>>
>> - physical space allocated by SUBVOLUME INCLUDING all space shared b=
y
>> other subvolumes
>
> That's the space reported by `du -hs /mnt/btrfs/subvolume`

it should be `du -hsx /mnt/btrfs/subvolume`
but what if there are reflinked/CoW files inside this subvolume?

>
>>
>> - physical space allocated by SUBVOLUME EXCLUDING all space shared b=
y
>> other subvolumes
>
> That's not implemented right now
>
>> Currently I can use only du, which is not reporting what I want to k=
now.
>>
>> Regards
>>
>> Roman Kapusta
>
> --
> Hubert Kario
> QBS - Quality Business Software
> 02-656 Warszawa, ul. Ksawer=C3=B3w 30/85
> tel. +48 (22) 646-61-51, 646-74-24
> www.qbs.com.pl
>
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Re: Space used by snapshot

[Hubert Kario]

On Thursday, February 17, 2011 13:38:58 Roman Kapusta wrote:
> On Thu, Feb 17, 2011 at 12:54, Hubert Kario <hka@qbs.com.pl> wrote:
> > On Thursday, February 17, 2011 12:13:53 Roman Kapusta wrote:
> >> Hello all,
> >>=20
> >> Is there any way how to obtain information how much space is
> >> physically allocated by given subvolume?
> >> I cannot find any. I'm interested in two values:
> >>=20
> >> - physical space allocated by SUBVOLUME INCLUDING all space shared=
 by
> >> other subvolumes
> >=20
> > That's the space reported by `du -hs /mnt/btrfs/subvolume`
>=20
> it should be `du -hsx /mnt/btrfs/subvolume`
> but what if there are reflinked/CoW files inside this subvolume?

True, forgot about them.

Regards,
--=20
Hubert Kario
QBS - Quality Business Software
02-656 Warszawa, ul. Ksawer=C3=B3w 30/85
tel. +48 (22) 646-61-51, 646-74-24
www.qbs.com.pl
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