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

Managing Filesets
Open System Services Management and Operations Guide—527191-002
5-3
Creating a Unique Fileset
are constantly created, deleted, and opened is a good candidate for the
BUFFERED CREATE option.
Although using the BUFFERED CREATE option for a fileset provides better
performance than not using it, the following disadvantages exist:
°
Fast-create filesets can contain only one disk volume, and the catalog must
reside on that volume.
°
If there is a double failure of the disk process serving a fast-create fileset,
recently created files might be permanently lost.
The fileset becomes inaccessible until it is stopped, repaired using the SCF
DIAGNOSE FILESET command (see Checking and Repairing Fileset
Integrity on page 5-22), and restarted.
°
Fileset recovery information is not recorded in the PXLOG catalog file (see
FSCK Log File on page 5-24).
°
After a double failure of an OSS name server, when the OSS Monitor
attempts to remount a fast-create fileset, the remount request is rejected
by the OSS name server. However, the OSS Monitor automatically runs
the FSCK utility against the fileset and then retries the remount.
HP recommends that you have a fast-create fileset named TEMP mounted on
/tmp. /tmp should be secured so that all users have read, write, and execute
or search permission, but only the file owner or the super ID can delete
directories or files from the fileset; use this command at an OSS shell prompt:
/bin/chmod 1777 /tmp
•
Specify a processor for the FSCK utility. This action allows you to spread fileset
recovery after a system load across many processors so that filesets can be
repaired in parallel. That practice allows for faster recovery and improves the
availability of the OSS file system.
Figure 5-1 on page 5-4 shows the relationships created among the configuration
files, processes, and disk volumes by using the SCF ADD FILESET command.
The figure illustrates the effects of this command:
ADD FILESET $ZPMON.MINE, CATALOG $CAT, POOL ZOSSMYPL, &
MNTPOINT "/mine", BUFFERED LOG, NAMESERVER #ZPNS1, &
NFSTIMEOUT 70, DESIREDSTATE STARTED, FSCKCPU -1, &
MAXDIRTYINODETIME 10, REPORT $S.#MINE
This command:
•
Adds the fileset named MINE at the mount point /mine of the local node and
sends repair information to the report file spooler location $S.#MINE
•
Keeps the fileset catalog on disk volume $CAT
•
Only checkpoints what would be PXLOG file entries
•
Allows up to 500,000 files (the default MAXINODES value) in the fileset.