Re: [Moosefs-users] how to calculate the space used by snapshot

[Michal B. <mic...@ge...>]

Hi!

To be honest there is no optimal method to measure it. There is "mfsdirinfo"
which returns occupied space but it gives wrong results in case of snapshots
(and hard links to be precise). So if one i-node in a subtree occurs twice
(as in hard link) it would be also counted twice. Similarly if a chunk (in
case of snapshot) occurs twice it would be also counted twice. 

One could probably try to write a special script which would calculate it
precisely using information in metadata.


Kind regards
Michał Borychowski 
MooseFS Support Manager
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Gemius S.A.
ul. Wołoska 7, 02-672 Warszawa
Budynek MARS, klatka D
Tel.: +4822 874-41-00
Fax : +4822 874-41-01



-----Original Message-----
From: youngcow [mailto:you...@gm...] 
Sent: Tuesday, February 08, 2011 7:43 AM
To: moosefs-users
Subject: [Moosefs-users] how to calculate the space used by snapshot

Hello!

I'm testing MooseFs. I have a question about snapshot.
When I make a snapshot for a directory such as dir1, the snapshot don't
use disk space.But when I change the source dir1's content(such as
change the content of a file), the snapshot will use the disk space.
Now I want to calcuate the disk space usage for snapshot, I can't find
the method.

Thanks.

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