Open System Services Management and Operations Guide (G06.27+, H06.04+)

Managing Filesets
Open System Services Management and Operations Guide—527191-003
5-21
Changing the Physical Makeup of a Fileset
Disabling OSS file caching changes the fault tolerant behavior of the fileset. Turning it
off converts OSSBUFFERED behavior to DP2BUFFERED behavior or
OSSBUFFEREDCP behavior to DP2BUFFEREDCP behavior.
The caching status of a file can change as opens, closes, and other events occur on
the file. The data integrity of a file and the access (data transfer) speed for the file are
affected by the following:
•
Whether OSS file caching is enabled
•
Where data is buffered and when it is checkpointed, as controlled by the settings
for the fileset FTIOMODE fault-tolerance attribute and the NORMALIOMODE
attribute
•
Which program access options are used, such as how the file is opened
When OSS file caching is enabled, behavior comparable to that experienced on a node
running an RVU prior to G06.27 occurs when the NORMALIOMODE fileset attribute is
OSSBUFFERED and the FTIOMODE fileset attribute is UNBUFFEREDCP.
Changing the Physical Makeup of a Fileset
You can change the physical makeup of a fileset by:
•
Changing the Fileset Catalog on page 5-21
•
Adding a Disk Volume to a Fileset on page 5-22
•
Removing a Disk Volume From a Storage-Pool File on page 5-22
•
Removing a Disk Volume From a Fileset on page 5-23
•
Moving a Disk Volume to Another Fileset on page 5-24
•
Controlling the Maximum Number of Files on page 6-29
Remember that a fileset can contain files on disk volumes that are not currently in the
fileset’s storage-pool file. When you perform operations that depend upon or potentially
change the device label for a fileset, you need to manage the files as well as the
fileset.
Changing the Fileset Catalog
To assign a new fileset catalog to a fileset:
1. Stop the fileset with the SCF STOP FILESET command, as described in Stopping
(Unmounting) a Fileset on page 5-13.
2. Use the SCF INFO FILESET Command with the DETAIL option to determine
whether the fileset uses the BUFFERED CREATE option.
If the fileset uses the BUFFERED CREATE option but not the READONLY TRUE
option, the creation pool for the fileset will be the new catalog disk volume of the
Note. HP recommends that the S_NONSTOP extension not be used in new applications. The
S_NONSTOP extension is ignored on nodes running an RVU more recent than G06.26 or
H06.03; the standard O_SYNC feature used with the FTIOMODE attribute provides better data
integrity and improved performance.