VERITAS File System 4.1 Release Notes (June 2006)

VERITAS File System 4.1 Release Notes
New Features
Chapter 112
• Storage Checkpoint File System Restore
Storage Checkpoints can be used by backup and restore applications to restore either
individual files or an entire file system. Restoring from Storage Checkpoints can recover
data from incorrectly modified files, but typically cannot be used to recover from hardware
damage or other file system integrity problems. File system restoration can be done using
the fsckpt_restore(1M) administrative command.
There is one new command associated with this feature:
fsckpt_restore VXFS Storage Checkpoint file system restoration utility.
• File Change Log
The VxFS File Change Log (FCL) tracks changes to files and directories in a file system.
The File Change Log can be used by applications such as backup products, webcrawlers,
search and indexing engines, and replication software that typically scan an entire file
system searching for modifications since a previous scan.
The following command is associated with FCL:
fcladm VxFS File Change Log administration utility.
The following new tunable parameters are associated with FCL:
fcl_keeptime Specifies the minimum amount of time for which FCL keeps records in
the log.
fcl_maxalloc Specifies the maximum amount of space that can be allocated to the
FCL.
fcl_winterval Specifies the interval that must elapse before the FCL records
subsequent writes to a file.
See the vxtunefs(1M) online manual page for more information on tunable parameters.
The File Change Log feature includes the following application programming interface
(API) functions:
vxfs_fcl_sync Sets a synchronization point in the File Change Log.
FCL functionality is a separately licensable feature.
• Reverse Path Name Lookup
The reverse path name lookup feature uses the vxlsino command to obtain the full path
name of a file or directory corresponding to an inode. Reverse path name lookup can be
useful in applications, such as for clients of the VxFS File Change Log feature, in backup
and restore utilities, and in replication products.
The following command is associated with the reverse name lookup: