The SMB 2.x MP signing feature is enabled in the default operating mode of the following versions of Data ONTAP in 7-Mode:
Data ONTAP 8.1.4, 8.1.4P1, and 8.1.4P2.
Data ONTAP 8.2.1.
Due to a software defect (refer to BUG 817844), the feature is disabled in its default-operating mode through BUG 823143 for the following releases:
Data ONTAP 8.1.4P3 and later versions of 8.1 releases.
Data ONTAP 8.2.1P1 and later versions of 8.2 releases.
So, In my two filers, In DOT814P2, MP signing is enabled by default. I cannot config it since there is no option? How to do it if I met some signing performance problem?
nyr98npnp2> version NetApp Release 8.1.4P2 7-Mode: Sun Apr 13 00:25:56 PDT 2014 nyr98npnp2> options cifs.smb2 cifs.smb2.enable on cifs.smb2.signing.required off cifs.smb2_1.branch_cache.enable off cifs.smb2_1.branch_cache.hash_time_out 3600 (value might be overwritten in takeover) nyr98npnp2>
In the other filer, the MP signing is default. What is the default mean?
nyr98npnp1> options cifs.smb2 cifs.smb2.enable on cifs.smb2.signing.multiprocessing default cifs.smb2.signing.required off cifs.smb2_1.branch_cache.enable off cifs.smb2_1.branch_cache.hash_time_out 3600 (value might be overwritten in takeover) nyr98npnp1>
In affected releases prior to the introduction of the option "cifs.smb2.signing.multiprocessing" there is an internal workaround available to customers via support.
In releases that have the options "cifs.smb2.signing.multiprocessing" there are 3 states. default, enabled, and disabled.
default=use whatever the default is for that ontap release. Signifies it has not specifically been set by the customer.
enabled/disabled=user specified operating modes.
Or like it says in the man page:
This option controls the SMB2 multiprocessor signing
optimization feature. If this option is enabled, it
allows CIFS to use multiple CPUs available in the con-
troller to compute and verify SMB2 security signature.
Enabling this feature may improve CIFS performance
when SMB2 protocol with security signature verifica-
tion is used. If this option is set to "default" the
feature is enabled or disabled depending on the Data
ONTAP version. The "cifs stat" command shows whether
SMB2 multiprocessor signing is enabled or disabled and
the system default value.
Values: default, enabled, disabled
Persistence: Remains in effect across system reboots
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