Open System Services Management and Operations Guide (G06.30+, H06.08+, J06.03+)

Changing the OSS File System Mount Point
Changing the mount point can affect the behavior of programs that use OSS files, particularly
programs that use the symbolic-link feature. You should notify users well in advance of changing
an existing mount point.
Changing OSS File Caching for the Disks of a Fileset
NOTE: HP recommends that you not modify OSS file caching at the disk level. The FTIOMODE
and NORMALIOMODE fileset attributes now provide better control over fault-tolerance and
performance for file input or output. See Table 10 (page 153) to map OSSCACHING ON and OFF
settings to the use of the new attributes.
You should decide whether to use OSS file caching when you first configure a fileset, because
changing the use of OSS file caching requires you to stop the fileset. For more information about
OSS file caching, see “OSS File-System Components” (page 33) and “OSS File Caching Overview”
(page 156).
If you want to enable OSS file caching initially for all disk volumes that contain OSS files, you
need do nothing. OSS file caching is enabled by default when disk volumes are configured.
If you disable OSS file caching, HP strongly recommends that you disable OSS file caching on all
the disk volumes in a fileset. To disable OSS file caching for a specific disk volume, you must
disable all filesets mounted on the affected fileset:
1. At a TACL prompt, enter:
SCF
2. At the SCF prompt, enter the following SCF command to stop each fileset involved:
STOP FILESET $ZPMON.filesetname
Enter this command beginning with the last fileset mounted on the affected fileset. Stop the
filesets in the reverse order in which they were last started. Stop the affected fileset last. If the
root fileset is the affected fileset, you can enter:
STOP FILESET $ZPMON.*
This command will stop all filesets in the correct order.
3. At an SCF prompt, enter the following set of commands once for each disk volume in the
fileset:
ALTER DISK diskname, OSSCACHING OFFdiskname
4. Restart the affected portion of the OSS file system by entering the following SCF command
one or more times:
START FILESET $ZPMON.filesetname
filesetname
is the name of each fileset that you previously stopped, specified in the order in which mount
points occur.
Similarly, to enable OSS file caching for a specific disk volume:
1. At a TACL prompt, enter:
SCF
2. At the SCF prompt, enter the following SCF command to stop each fileset involved:
STOP FILESET $ZPMON.filesetname
Enter this command beginning with the last fileset mounted on the affected fileset. Stop the
filesets in the reverse order in which they were last started. Stop the affected fileset last. If the
root fileset is the affected fileset, you can enter:
STOP FILESET $ZPMON.*
Reconfiguring a Fileset 155