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

Managing Filesets
Open System Services Management and Operations Guide—527191-002
5-2
Creating a Unique Fileset
•
To create the directory /home/henrysp from within the Guardian
environment, enter the following commands at a TACL prompt:
OSH -p /bin/mkdir /home/henrysp
OSH -p /bin/chmod 0777 /home/henrysp
Note that the OSS shell chmod command gives read, write, and search (execute)
permission to all users of OSS files within the mount-point directory. The UNIX
sticky bit can also be set so that only the super ID can delete files from the fileset;
to set the sticky bit, specify chmod 1777 instead of chmod 0777.
2. Create a storage-pool file with the name specified in the new ZOSSFSET entry.
This action is described in Creating a Storage Pool on page 5-6.
3. Add a record for the fileset to the ZOSSFSET file by using the SCF ADD FILESET
command. Select the appropriate settings for the fileset:
•
HP suggests that you select a consistent name for the fileset, directory mount
point, and report file filename to make administration of the fileset easier.
•
If the fileset is frequently used, consider having it started or restarted
automatically after a system load or processor failure. An automatically started
fileset cannot start until all filesets above it in the OSS directory hierarchy are
started, so a fileset with a DESIREDSTATE of STARTED cannot start if it uses
a mount point on a fileset with a DESIREDSTATE of STOPPED.
•
Read the information under Changing Fileset Buffering on page 5-15 and
choose a buffering option. These options allow you to increase the relative
speed of access to the fileset at the expense of increasing the probability of
needing to perform a recovery (repair) for the fileset after a failure. Using a
memory cache to buffer open and close catalog file information for the fileset
instead of recording each transaction in a disk file speeds up transaction
processing slightly; however, if the cache is lost before it can be flushed to
disk, the true state of the fileset cannot be determined without performing a
recovery on it.
A fileset using the BUFFERED NONE option provides the highest assurance of
data integrity and is the least likely to require a recovery but provides the
slowest access time. A fileset in which file creation, deletion, and opens are
infrequent is a good candidate for the BUFFERED NONE option.
A fileset using the default BUFFERED LOG option provides slightly faster
access time by using memory cache for some open and close catalog file
information; the tradeoff between performance and recovery for such filesets
can be adjusted using the MAXDIRTYINODETIME option. A fileset in which file
creation, deletion, or opens are a relatively common occurrence is a a good
candidate for the BUFFERED LOG option.
A fileset using the BUFFERED CREATE (fast-create) option provides the
fastest access time but with reduced assurance of data integrity and the
highest probability of requiring a recovery after a failure. A fileset in which files