Too Many Cifs Audit Files Can Cause System Performance Degradation; Cifs Client Authentication Fails If Host Name Exceeds 16 Characters; Failed Cifs Connections Due To Signature Mismatch; Configuring User Mapping For A Default User Quota With Cifs Licensed But Not Configured Could Severely Degrade Performance - IBM N Series Manual

v Use the cifs prefdc add command to add the writable domain controller
to the list of preferred domain controllers on the storage system.
For information about the cifs prefdc add command, see the Data ONTAP
8.0 7-Mode File Access and Protocols Management Guide.

Too many CIFS audit files can cause system performance degradation

If the option cifs.audit.autosave.file.limit is set to 0, it allows an
unlimited number of log files to be saved in the /etc/log directory. However,
too many log files in this directory can cause system performance
degradation.
If you set this option to 0, you should regularly monitor the /etc/log
directory and remove unnecessary log files to prevent performance issues.

CIFS client authentication fails if host name exceeds 16 characters

If a CIFS client with a NetBIOS name of more than 16 characters attempts to
connect to the storage system, the authentication fails.
The storage system log records the following error message:
AUTH:SPNEGO-Could not unpack NTLMSSP Authenticate token.
The connecting client displays the following error message:
NT_STATUS_MORE_PROCESSING_REQUIRED.
To avoid this issue, you must ensure that the CIFS client name does not
exceed 16 characters so that it complies with NetBIOS specifications.

Failed CIFS connections due to signature mismatch

If you enable SMB signing on an alive and active CIFS server, existing CIFS
connections might fail due to signature mismatch.
To prevent this, use the cifs terminate command to shut down the CIFS
server and ensure that all existing CIFS connections are terminated before
enabling SMB signing. After enabling SMB signing, use the cifs restart
command to restart the CIFS server.
Configuring user mapping for a default user quota with CIFS licensed but
not configured could severely degrade performance
If you configure user mapping for a default user quota on a storage system
for which CIFS is licensed but not configured, a later attempt to delete a qtree
could result in significantly degraded performance. If you license CIFS, you
must also configure it completely to avoid this issue.
Known problems and limitations
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