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Allocating data

The following script creates a large number of files to demonstrate the benefit of allocating data:

i=1

while [ $i -lt 1000 ]

do

dd if=/dev/zero of=/mnt1/$i bs=65536 count=1

i='expr $i + 1'

done

Before the script completes, vol1 runs out of space even though space is still available on the vol2 volume:

# fsvoladm list /mnt1

devid size used avail name

0 51200 51200 0 vol1

1 51200 221 50979 vol2

The solution is to assign an allocation policy that allocates user data from the vol1 volume to vol2 if space runs out.

 Allocating data from vol1 to vol2

# fsapadm define /mnt1 datapolicy vol1 vol2

You must have system administrator privileges to create, remove, change policies, or set file system or Storage Checkpoint level policies. Users can assign a pre-existing policy to their files if the policy allows that. Policies can be inherited for new files.