Maximum numbers of users in CLEARCASE_PRIMARY_GROUP?

StackOverflow https://stackoverflow.com/questions/21486161

  •  05-10-2022
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Question

Is there any limit to add users in CLEARCASE_PRIMARY_GROUP?

In Unix/Linux, you can add only up to 32.
Is there any limit on this in windows ClearCase?

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Solution

According to this IBM article:

ClearCase does enforce a limitation on the number of ClearCase groups a user may belong to.

The SUNRPC protocol that we use can process a maximum of 32 groups on Windows and 16 groups on Unix.
This means that users in an all Windows environment can have a maximum of 32 groups that can use ClearCase and 16 groups in an all Unix environment or a Windows and Unix interop environment.

By default, ClearCase will recognize only the first 32 groups of a user's group list as displayed by the output of the creds utility on Windows.
The total of 32 groups includes the Windows primary group or CLEARCASE_PRIMARY_GROUP variable and the next 31 groups either from the creds output or from the CLEARCASE_GROUPS variable.

The environment variables, CLEARCASE_GROUPS and CLEARCASE_PRIMARY_GROUP, can help to resolve or alleviate some of the issues that may arise due to this limitation.

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