Arch Linux

techmagyor

Member

Registered: 2010-08-25

Posts: 31

BTRFS missing ~100gb

Hi,
i recently installed the system without any problems(self compiled vanilla kernel 2.6.38.2 on a non-testing repo system) and used btrfs as /home partition, 326gb total. So my df:

Filesystem           1K-blocks      Used Available Use% Mounted on                                                                                                                                                      
...                                                                                                                                                        
/dev/sda5            341798908  51574144 177363492  23% /home                                                                                                                                                           
...

You can clearly check that 100gb around are missing. that's my fstab part:

/dev/sda5 /home btrfs defaults,nodatacow,space_cache 0 1 

Reading afterwards the wiki [url= https://btrfs.wiki.kernel.org/index.php … nt_Options /url] i see the option :

metadata_ratio=<number> - Sets the number of data chunks that need to be allocated to force a metadata chunk allocation. By default this is set to 8.

Maybe it's related to this or there's something that i didn't do?

Thanks in advance

Last edited by techmagyor (2011-04-03 23:45:11)

karol

Archivist

Registered: 2009-05-06

Posts: 25,440

Re: BTRFS missing ~100gb

Read this too.

sand_man

Member

From: Australia

Registered: 2008-06-10

Posts: 2,164

Re: BTRFS missing ~100gb

Also read this, https://lkml.org/lkml/2010/6/18/144
Not sure if it's still relevant or not but it seems it is due to poor initial design.

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