Open System Services Management and Operations Guide (G06.29+, H06.07+)

Open System Services Monitor
Open System Services Management and Operations Guide—527191-005
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ALTER FILESET Command
FTIOMODE { UNBUFFEREDCP | DP2BUFFEREDCP | OSSBUFFEREDCP }
specifies the input/output buffering and fault tolerance for application file opens that
use the O_SYNC option:
If FTIOMODE is not specified, the default behavior is UNBUFFEREDCP.
MAXDIRTYINODETIME seconds2
specifies the approximate number of seconds that cached inodes of the fileset
remain in the OSS name server’s inode cache without being updated. seconds2
must be a value in the range 1 through 600.
When the MAXDIRTYINODETIME option is omitted, the previous value for the
fileset is unchanged.
MAXINODES maxinodes
specifies the approximate maximum number of inodes that can be created for the
fileset. maxinodes must be a value in the range 100000 through 2200000. If the
MAXINODES option is omitted, the previous value for the fileset is unchanged.
MNTPOINT { "directory" | 'directory' }
specifies the pathname of the OSS directory that serves as the mount point for the
fileset. The specified directory must already exist in the OSS file system.
The quotation marks are required. If a pathname contains a quotation mark, either
specify that quotation mark twice or use the alternate set of marks to delimit the
value.
Directory names are case-sensitive.
UNBUFFEREDCP Use unbuffered input/output with checkpointing. This
behavior provides maximum fault tolerance but with
reduced performance.
DP2BUFFEREDCP Use disk-process-buffered input/output with
checkpointing. This behavior provides fault tolerance for
single failures, with better performance than
UNBUFFEREDCP. DP2 buffers file data and checkpoints
the file state to its backup process to ensure recovery
from single failures.
OSSBUFFEREDCP Use OSS-buffered input/output with checkpointing. This
behavior provides fault tolerance for single failures, with
better performance than DP2BUFFEREDCP. OSS
filesystem processes and DP2 share responsibility for
buffering file data; OSS provides the buffering whenever
possible. DP2 checkpoints the file state to its backup
process to ensure recovery from single failures.