Open System Services Management and Operations Guide (G06.25+, H06.03+)

Understanding the OSS File System
Open System Services Management and Operations Guide—527191-002
3-10
OSS Configuration Files
For this reason, a storage-pool file cannot contain more than 20 active volume names
(the creation pool) but the volume list maintained by an OSS name server for the fileset
(the entire storage pool) can contain up to 256 disk volumes. See FSCK Log File on
page 5-24 for more information about the volume list.
You should not set up a fileset to use a disk volume that is not always in the storage-
pool file for that fileset. Normal operating procedures for a fileset can have unplanned
side effects on the OSS files on such disk volumes. See Changing the Physical
Makeup of a Fileset on page 5-19 for more information.
While OSS filesets can span multiple physical disk volumes, individual files cannot.
Thus if you allocate for a fileset a disk volume that is running out of space, you might
not be able to extend existing files or write new large files on that volume, even if all
other available volumes are nearly empty.
After a fileset is created, you can check the individual disk volumes in the fileset’s
storage-pool file to monitor the disk space that the fileset is using. If one or more
volumes are almost full, you can make more volumes available for the fileset. To do
this, unmount the fileset, add more volumes to the storage-pool file, and then remount
the fileset. From this point on, as that OSS name server for that fileset continues to
Figure 3-4. Storage Pools and Disk Volumes
VST018.VSD
Disk volumes containing OSS
files in fileset DATA5
OSS name
server
Disk volume containing
storage-pool file
Disk
volumes
on which
new OSS
files can
be
created
in fileset
DATA5
Finding
space for
creating a
file
Finding an
existing file