Veritas File System 5.1 SP1 Administrator"s Guide (5900-1499, April 2011)

Specifies the duration in seconds that FCL records stay in the FCL
file before they can be purged. The first records to be purged are
the oldest ones, which are located at the beginning of the file.
Additionally, records at the beginning of the file can be purged if
allocation to the FCL file exceeds fcl_maxalloc bytes. The
default value of fcl_keeptime is 0. If the fcl_maxalloc
parameter is set, records are purged from the FCL file if the
amount of space allocated to the FCL file exceeds fcl_maxalloc.
This is true even if the elapsed time the records have been in the
log is less than the value of fcl_keeptime.
fcl_keeptime
Specifies the maximum number of spaces in bytes to be allocated
to the FCL file. When the space allocated exceeds fcl_maxalloc,
a hole is punched at the beginning of the file. As a result, records
are purged and the first valid offset (fc_foff) is updated. In
addition, fcl_maxalloc may be violated if the oldest record has
not reached fcl_keeptime.
The minimum value of fcl_maxalloc is 4 MB. The default value
is fs_size/33.
fcl_maxalloc
Specifies the time in seconds that must elapse before the FCL
records an overwrite, extending write, or a truncate. This helps
to reduce the number of repetitive records in the FCL. The
fcl_winterval timeout is per inode. If an inode happens to go
out of cache and returns, its write interval is reset. As a result,
there could be more than one write record for that file in the same
write interval. The default value is 3600 seconds.
fcl_winterval
The time interval in seconds within which subsequent opens of a
file do not produce an additional FCL record. This helps to reduce
the number of repetitive records logged in the FCL file. If the
tracking of access information is also enabled, a subsequent file
open even within the fcl_ointerval may produce a record, if
it is opened by a different user. Similarly, if the inode is bumped
out of cache, this may also produce more than one record within
the same open interval.
The default value is 600 sec.
fcl_ointerval
Either or both fcl_maxalloc and fcl_keeptime must be set to activate the FCL
feature. The following are examples of using the fcladm command.
To activate FCL for a mounted file system, type the following:
# fcladm on mount_point
To deactivate the FCL for a mounted file system, type the following:
File Change Log
File Change Log administrative interface
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