Apple Xsan 2 - Manual (Page 153)

Appendix C Use command-line tools 153
Create and preallocate a file (cvmkfile)
Use the cvmkfile command to allocate space for a file on an Xsan volume.
$ cvmkfile [-k affinity] [-p] [-s] [-w] [-z] size(k|m|g) filename
Parameter Description
-k affinity Allocate space for the file on one of the storage
pools with the specified affinity tag.
affinity – the affinity tag that’s assigned to
the storage pools where you want the folder’s
contents to be stored
You can use the
show long command of the
cvadmin tool to see a storage pool’s affinity tag.
-p Force future extensions of the file to be aligned
on block boundaries.
-s Force the file allocation to align with block
boundaries.
-w Set file size as indicated by size.
-z Set the contents of the file to zeros.
size (k|m|g) A number specifying the amount of space to
allocate to the file.
size – a number
k – kilobytes
m – megabytes
g – gigabytes
filename The path to and name of the file to allocate.
Example
Allocate 2 GB of space for the file “data1” on the storage pool “datasets”:
$ cvmkfile -k datasets 2g data1
Initialize a volume (cvmkfs)
Use the cvmkfs command to initialize an Xsan volume based on the information in the
volume’s configuration (in /Library/Preferences/Xsan/volume.cfg).
WARNING: Initializing a volume destroys all existing data on the volume.
$ sudo cvmkfs [-G] [-F] [volume]