Release Notes
|DB2 Data Links Manager will now be able to take advantage of the
|functionality of Tivoli Space Manager. The Tivoli Space Manager
|Hierarchical Storage Manager (HSM) client program automatically migrates
|eligible files to storage to maintain specific levels of free space on local
|file systems. It automatically recalls migrated files when they are
|accessed, and permits users to migrate and recall specific files.
|The prerequisite for this functionality is Tivoli Space Manager
|Version 4.2.
|This new feature benefits customers who have file systems with large
|files that are required to be moved to tertiary storage periodically, in which
|the space of the file system needs to be managed on a regular basis.
|For many customers, Tivoli Space Manager currently provides the means to
|manage their tertiary storage. The new DB2 Data Links Manager support
|of Tivoli Space Manager provides greater flexibility in managing the space for
|DATALINK files. Rather than pre-allocating enough storage in the DB2
|Data Links Manager file system for all files which may be stored there, Tivoli
|Space Manager allows allocations of the Data Links-managed file system to be
|adjusted over a period of time without the risk of inadvertently filling up
|the file system during normal usage.
|
- |Adding both Data Links and HSM support to a file system
-
|When registering a file system with Hierarchical Storage Management (HSM),
|register it with HSM first and then with the DataLinks File
|Manager.
|
- |Register with HSM, using the command "dsmmigfs add /fs".
- |Register with DLM, using the command "dlfmfsmd /fs".
|
|Data Links support for a file system is reflected in the stanza in
|/etc/filesystems for an HSM file system via the following
|entries:
| vfs = dlfs
| mount = false
| options = rw,Basefs=fsm
| nodename = -
- |Adding Data Links support to an existing HSM file system
- |Register with DLM, using the command "dlfmfsmd /fs".
- |Adding HSM support to an existing Data Links file system
-
|
- |Register with HSM, using the command "dsmmigfs add /fs".
- |Register with DLM, using the command "dlfmfsmd /fs".
|
- |Removing Data Links support from a Data Links-HSM file system
- |Remove Data Links support, using the command "dlfmfsmd -j
|/fs".
- |Removing HSM support from a Data Links-HSM file system
-
|
- |Remove HSM support, using the command "dsmmigfs remove
|/fs".
- |Remove Data Links support, "dlfmfsmd -j /fs".
- |Register with DLM, using the command "dlfmfsmd /fs".
|
- |Removing both Data Links and HSM support from a Data Links-HSM file system
-
|
- |Remove HSM support, using the command "dsmmigfs remove
|/fs".
- |Remove Data Links support, using the command "dlfmfsmd -j
|/fs".
|
|
- |This function is currently supported on AIX only.
- |
- |Selective migration (dsmmigrate) and recall of an FC (Read permission DB)
|linked file should be done by a root user only.
- |Selective migration can be performed only by the file owner which in the
|case of Read Permission DB files is the DataLink Manager Administrator
|(dlfm). To access such files a token is required from the host database
|side. The only user who does not require a token is the "root"
|user. It will be easier for a "root" user to perform the selective
|migrate and recall on Read Permission DB files. The dlfm user can
|migrate an FC file using a valid token only the first time. The second
|time migration is attempted (after a recall ), the operation will fail with
|error message "ANS1028S Internal program error. Please see your service
|representative." Running dsmmigrate on an FC file by a
|non-root user will not succeed. This limitation is minor as it is
|typically the administrators who will access the files on the
|fileserver.
- |stat and statfs system calls will show Vfs-type as fsm rather than dlfs,
|although dlfs is mounted over fsm.
- |The above behavior is for the normal functionality of
|dsmrecallddaemons, which performs statfs on the file system to
|check if its Vfs-type is fsm or not.
- |Command "dsmls" does not show any output if a file having the minimum
|inode number is FC (Read permission DB) linked
- |The dsmls command is similar to the ls command and
|lists the files being administered by TSM. No user action is required
|
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