Rational ClearCase Commands Reference

ClearCase Dynamic Views—Using Express Builds

You can configure a dynamic view to use the express builds feature by creating the view with the –nshareable_dos option. When you invoke clearmake or omake in this kind of view, clearmake or omake builds nonshareable derived objects (DOs). Information about these DOs is not written into the VOB, so the build is faster; however, nonshareable DOs cannot be winked in by other views.

If you do not specify –shareable_dos or –nshareable_dos, mkview uses the site-wide default set in the registry (with the setsite command). If there is no site-wide default, mkview configures the view so that builds in the view create shareable DOs.

To change the DO property for an existing view, use the chview command. For more information on shareable and nonshareable DOs, see Building Software.

ClearCase Dynamic Views on UNIX—Marking a View for Export

A dynamic view to be used for NFS export of one or more VOBs (for access by applications other than those in the ClearCase Product Family) must be marked in the registry as an export view. Each export view is assigned an export ID, which ensures that NFS-exported view/VOB combinations have stable NFS file handles across server reboots or shutdown and restart of ClearCase.

If the dynamic view is registered in multiple regions, the export marking must be on the view tag in the server host's default region. To create an export view, use the –ncaexported option. You can register an existing dynamic view or VOB for export by using mktag –replace –ncaexported. For information about exporting view-VOB combinations, see the export_mvfs reference page.

ClearCase Dynamic Views on UNIX—Activating a View

Creating a view tag also executes the startview command, which activates the dynamic view on the current host (unless the tag's target network region does not include the local host.) It also places an entry in the host's viewroot directory. (For example, specifying –tag gamma creates the entry /view/gamma.)

After it is activated, a dynamic view can be set with the setview command; it can also be accessed with view-extended naming. (For details, see the startview and pathnames_ccase reference pages.)

ClearCase Dynamic Views on Windows—Activating a View

Creating a view tag also executes the startview command, which activates the dynamic view on the current host (unless the tag's target network region does not include the local host.) It also places an entry in the host's dynamic-views root directory (by default, drive M). (For example, specifying –tag gamma creates the entry gamma.)

After a dynamic view is activated, you can assign it to a drive letter with the net use command or by clicking Tools > Map Network Drive in Windows Explorer; it can also be accessed with view-extended naming. (For details, see the startview and pathnames_ccase reference pages.)

ClearCase and ClearCase LT Snapshot Views—Activating a View

Snapshot views cannot be explicitly activated and cannot be accessed using view-extended naming. However, a snapshot view becomes active when you change to the view directory and issue a ClearCase or ClearCase LT command.

ClearCase and ClearCase LT on UNIX—View Creator Identity and umask Permissions

Avoid creating views as root. This often causes problems with remote access to a view, because root on one host often becomes user ID –2 (user nobody) when accessing other hosts.

Your current umask(1) setting determines which users can access the view. For example, a umask value of 2 allows anyone to read data in the view, but only you (the view's owner) and others in your group can write data to it—create view-private files, build derived objects, and so on. If your umask value is 22, only you can write data to the new view.

ClearCase —View Storage Directory on a Network Attached Storage Device

You may create a view with storage on a supported network attached storage (NAS) device. We recommend using a server storage location for this purpose. See the mkstgloc reference page for information. To use mkview to create a view that resides on a NAS device, you must specify the option set, –host –hpath –gpath. (NAS devices must be specially configured for use with ClearCase. See the Administrator's Guide for details.)