The pathname parameter is the path name to a volume. If it is specified, df reports only on the corresponding volume; otherwise, it reports on every on-line volume.
For each volume, df displays statistics about snapshots on a separate line from statistics about the active file system. The snapshot line reports the amount of space consumed by all the snapshots in the system. Blocks that are referenced by both the active file system and by one or more snapshots are counted only in the active file system line, not in the snapshot line.
If snapshots consume more space than has been reserved for them by the snap reserve command (see na_snap(1)), then the excess space consumed by snapshots is reported as used by the active file system as well as by snapshots. In this case, it may appear that more blocks have been used in total than are actually present in the file system.
With the -i option, df displays statistics on the number of free inodes.
toaster> df Filesystem kbytes used avail capacity Mounted on /vol/vol0 4339168 1777824 2561344 41% /vol/vol0 /vol/vol0/.snapshot 1084788 956716 128072 88% /vol/vol0/.snapshot
If snapshots consume more than 100% of the space reserved for them, then either the snapshot reserve should be increased (using snap reserve) or else some of the snapshots should be deleted (using snap delete). After deleting some snapshots, it may make sense to alter the volume's snapshot schedule (using snap schedule) to reduce the number of snapshots that are kept on line.
The following example shows file system inode usage for a specified volume:
toaster> df -i /vol/vol0 Filesystem iused ifree %iused Mounted on /vol/vol0 164591 14313 92% /vol/vol0
You can increase the number of inodes in a file system at any time using the maxfiles command (see maxfiles(1)).