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File Sharing Between NFS and CIFS Users5-17
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Windows verifies each request for access to files. Each access usually takes between
10 and 500 milliseconds, and can take longer because contacting a domain controller
to create a WAFL credential is time-consuming. To reduce the time spent in contact-
ing a domain controller, the filer can cache the WAFL credential in a credential cache.
This cache is called the WAFL credential cache.
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The default configuration stores each WAFL credential for 20 minutes. This is gener-
ally sufficient for most situations.
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You can manage the cache globally with options and specifically with the
wcc com-
mand. This enables you to add entries to and remove entries from the WAFL
credential cache and to troubleshoot file access problems that might be caused by
mapping problems.
NOTE: If you make changes to the WAFL credential cache and an NFS client has
cached information, it can take a noticeable amount of time for the changes to
become visible.
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If the default configuration does not work well for your site, you can use an option to
set how long each WAFL credential cache entry is valid. You can also trace CIFS logins
as an aid to debugging mapping problems.
To set how long each WAFL credential cache entry is valid, use the
wafl.wcc_minutes_valid option, as described in Setting How Long Each
Wafl Credential Cache Entry Is Valid.
To display information about every CIFS login attempt, use the CIFS login tracing
feature, as described in Toggling CIFS Login Tracing.
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You use the wcc command to perform the following tasks:
Add names to or remove names from the WAFL credential cache, as described in
Adding an Entry to the WAFL Credential Cache and Deleting Entries from the
WAFL Credential Cache.
Monitor the WAFL credential cache by displaying statistics about it, as described
in Displaying WAFL Credential Cache Statistics.