xfs_estimate - estimate the space that an XFS filesystem will take

xfs_estimate [ -h? ] [ -b blocksize ] [ -i logsize ]
		   [ -e logsize ] [ -v ] directory ...

For each directory argument, xfs_estimate estimates the space that directory would take if it were copied to an XFS filesystem. xfs_estimate does not cross mount points. The following definitions are used:

KB = *1024

MB = *1024*1024

GB = *1024*1024*1024

The xfs_estimate options are:

-b blocksize

Use blocksize instead of the default blocksize of 4096 bytes. The modifier k can be used after the number to indicate multiplication by 1024. For example, xfs_estimate -b 64k /

requests an estimate of the space required by the directory / on an XFS filesystem using a blocksize of 64K (65536) bytes.

-v

Display more information, formatted.

-h

Display usage message.

-?

Display usage message.

-i, -e logsize

Use logsize instead of the default log size of 1000 blocks. -i refers to an internal log, while -e refers to an external log. The modifiers k or m can be used after the number to indicate multiplication by 1024 or 1048576, respectively.

For example, xfs_estimate -i 1m /

requests an estimate of the space required by the directory / on an XFS filesystem using an internal log of 1 megabyte.

% xfs_estimate -e 10m /var/tmp
/var/tmp will take about 4.2 megabytes
        with the external log using 2560 blocks or about 10.0 megabytes

% xfs_estimate -v -e 10m /var/tmp
directory                     bsize   blocks    megabytes    logsize
/var/tmp                       4096      792        4.0MB   10485760

% xfs_estimate -v /var/tmp
directory                     bsize   blocks    megabytes    logsize
/var/tmp                       4096     3352       14.0MB   10485760

% xfs_estimate /var/tmp
/var/tmp will take about 14.0 megabytes