mkpool

Each file element is assigned to one source pool and one cleartext pool. The source pool provides permanent storage, in one or more data container files, for all of the element's versions. If the element's versions are stored in a compressed format, the cleartext pool is used to cache extracted versions of that element, as described earlier. (If each version is stored uncompressed in a separate data container, the cleartext pool is not used.)

Each directory element is also assigned to one source pool and one cleartext pool. But directory versions themselves are not stored in these pools. (They are stored directly in the VOB database.) Rather, a directory's pool assignments are used solely for pool inheritance: each element created within the directory inherits its source and cleartext pool assignments.

Each directory element is also assigned to one derived object pool. All shared derived objects with path names in that directory are stored in that pool. A new directory element inherits the derived object pool of its parent, along with the source and cleartext pools.

The pool inheritance scheme begins at the VOB root directory (top-level directory element) created by mkvob, which is automatically assigned to the default pools.

You can change any of an element's pool assignments with the chpool command.

Scrubbing is the process of reclaiming space in a derived object pool or cleartext pool. (Source pools are not subject to scrubbing.) This process is performed by the scrubber utility. mkpool initializes or updates these scrubbing parameters:

The default settings for the scrubbing parameters are max-kbytes = 0, reclaim-kbytes = 0, hours = 96. For details on how these parameters are interpreted, see the scrubber reference page.

By default, the scheduler runs scrubber periodically. For information on describing and changing scheduled jobs, see the schedule reference page.

The lspool command lists a VOB's storage pools. If you include the –long option, the current settings of the scrubbing parameters are listed, as well. (The describe –pool command displays the same information as lspool –long.)

Default

You must specify the kind of pool, unless you use –update and name an existing pool. The following options are mutually exclusive.

–sou/rce

Creates a source pool.

–der/ived

Creates a derived object pool.

–cle/artext

Creates a cleartext pool.

–upd/ate

Asserts that the parameters of an existing pool are to be updated. You must also use a –size and/or –age option.

Default

Creates a storage pool as a subdirectory under the VOB storage directory.

–ln pname

Creates a storage pool directory at pname, and creates pool-name in the VOB storage directory as a symbolic link to pname. You can create only one pool when using this option.

Restriction: pname must be a full path name, starting with a slash (/). It must also be a global path name, valid on every host from which users will access the VOB. mkpool attempts to verify that this path name is truly global, using a simple heuristic. (For example, a path name that begins with /net is likely to be global.) If it suspects that pname is not global, mkpool proceeds anyway, but displays a warning message:

Warning: Linktext for pool does not appear to be a global path.

This mechanism is independent of the network storage registry facility. Thus, the path name to a remote storage pool directory must be truly global, not global within a particular network region.

Important: Keep source pools local, within the VOB storage directory. This strategy optimizes data integrity: a single disk partition contains all of the VOB's essential data. It also simplifies backup/restore procedures.

Default

For a new derived object or cleartext pool: the maximum size and reclaim size parameters are set to 0, which enables a special scrubbing procedure. (See the scrubber reference page.) The age parameter is set to 96 (hours). These parameters are meaningless for a source pool.

When updating an existing pool, you must use at least one of –size and –age.

–siz/e max-kbytes reclaim-kbytes

Specifies that the pool is scrubbed if its size exceeds max-kbytes KB; scrubbing will continues until the pool reaches the goal size of reclaim-kbytes KB.

–age hours

Prevents scrubbing of derived objects or cleartext files that have been referenced within the specified number of hours. Specifying –age 0 restores the default age setting (96 hours).

Default

If scrubber fails to scrub a pool below its max-kbytes level, it logs a warning message in /var/adm/devops/clearcase/log/scrubber_log (UNIX and Linux) or the Windows event log, but takes no other action.

–ale/rt command

Causes scrubber to run the specified command (typically, a shell script or batch file) whenever it fails to scrub a pool below its max-kbytes level.

Windows: If you invoke a command built in to the Windows shell (for example, cd, del, dir, or copy) instead of a batch file, you must invoke the shell with cmd /c. For example:

–alert 'cmd /c cd \tmp & del *.*'

Default

Creates one or more event records, with commenting controlled by your .clearcase_profile file (default: –cqe). See the comments reference page. Comments can be edited with chevent.

–c/omment comment | –cfi/le comment-file-pname |–cq/uery | –cqe/ach | –nc/omment

Overrides the default with the option you specify. See the comments reference page.

Default

Creates or updates a pool in the VOB containing the current working directory unless you specify another VOB with the @vob-selector suffix.

pool-selector ...

One or more names for the storage pools to be created. Specify pool-selector in the form [pool:]pool-name[@vob-selector]

pool-selector

pool-name	Name of the storage pool See the cleartool reference page for rules about composing names.
vob-selector	VOB specifier Specify vob-selector in the form [vob:]pname-in-vob
	pname-in-vob	Pathname of the VOB tag (whether or not the VOB is mounted) or of any file system object within the VOB (if the VOB is mounted)