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Grow a filesystem: (from http://www.geocities.com/lynchmaryann/configure.htm)
If you wish to grow a file system, edit the mcf file and add the names of additional disk devices. If you are growing a QFS file system, you must add at least one metadata device when you add the disk device. Force sam-fsd to reread the mcf file with samd config, unmount the file system, then use the command samgrowfs to force the file system to grow.

Master Config File is, e.g.,

root@node0# more /etc/opt/SUNWsamfs/mcf
archives        20      ma      archives        on      shared
/dev/did/dsk/d6s0       21      mm      archives on     -
/dev/did/dsk/d6s6       22      mr      archives on     -
database        30      ma      database        on      shared
/dev/did/dsk/d8s0       31      mm      database on     -
/dev/did/dsk/d8s6       32      mr      database on

Filesystems are composed of a data disk and ametadata disk.

General info

root@node0# samfsinfo database
samfsinfo: filesystem database is mounted.
name:     database       version:     2    shared
time:     Mon Apr 14 15:02:25 MDT 2008
count:    2
capacity:      00000000167fdfc0          DAU:         64
space:         000000000b71c700
meta capacity: 0000000002800000          meta DAU:    16
meta space:    00000000027f5fc0
ord  eq           capacity              space   device
  0  31   0000000002800000   00000000027f5fc0   /dev/did/dsk/d8s0
  1  32   00000000167fdfc0   00000000167fdf80   /dev/did/dsk/d8s6