Cisco MDS NX-OS software supports three types of hardware for the Cisco MDS 9500 Series Directors: Generation 1, Generation 2, and Generation 3.

Generation 3 includes the following:

• 48-port 8-Gbps Fibre Channel switching module

• 24-port 8-Gbps Fibre Channel switching module

• 4/44-port 8-Gbps Host-Optimized Fibre Channel module

• Cisco MDS 9513 Fabric-2 Crossbar Switching module

Note	The new software features in Cisco MDS NX-OS Release 4.1(1b) and later are not supported in the Generation 1 hardware.

Note	The Cisco MDS NX-OS software does not support the following hardware: Supervisor-1 module, the IPS-4 and IPS-8 storage modules, the Cisco MDS 9216 switch, the Cisco MDS 9216A switch, the Cisco MDS 9020 switch, the Cisco MDS 9120 switch, and the Cisco MDS 9140 switch.

Generation 2 hardware includes the following:

• Cisco MDS 9513 Director chassis

• Supervisor-2 module

• MSM-18/4 Multiservice Storage module

• Cisco MDS 9222i Module-1 module

• 48-port 4-Gbps Fibre Channel switching module

• 24-port 4-Gbps Fibre Channel switching module

• 12-port 4-Gbps Fibre Channel switching module

• 4-port 10-Gbps Fibre Channel switching module

The Cisco MDS NX-OS software on the Cisco MDS 9500 Series Directors supports the following types of crossbars:

• Integrated crossbar—Located on the Supervisor-1 and Supervisor-2 modules. The Cisco MDS 9506 and 9509 Directors only use integrated crossbars.

• External crossbar—Located on an external crossbar switching module. Cisco MDS 9513 Directors require external crossbar modules.

Generation 1 hardware includes the following:

• Cisco MDS 9506 and 9509 Director chassis

• Supervisor-1 module

• 32-port 2-Gbps Fibre Channel switching module

• 16-port 2-Gbps Fibre Channel switching module

• 8-port IP Storage Services (IPS-8) module

• 4-port IP Storage Services (IPS-4) module

• Storage Services Module (SSM)

• 14/2-port Multiprotocol Services (MPS-14/2) module

Built-in automatic sensors are provided in all switches in the Cisco MDS 9000 Family to monitor your switch at all times.

Each module (switching and supervisor) has four sensors: 1 (outlet sensor), 2 (intake sensor), 3 (onboard sensor), and 4 (onboard sensor). Each sensor has two thresholds (in degrees Celsius): minor and major.

Note	A threshold value of –127 indicates that no thresholds are configured or applicable.

• Minor threshold—When a minor threshold is exceeded, a minor alarm occurs and the following action is taken for all four sensors:

  • System messages are displayed.

  • Call Home alerts are sent (if configured).

  • SNMP notifications are sent (if configured).

• Major threshold—When a major threshold is exceeded, a major alarm occurs and the following action is taken:

  • For sensors 1, 3, and 4 (outlet and onboard sensors):

    System messages are displayed.

    Call Home alerts are sent (if configured).

    SNMP notifications are sent (if configured).

  • For sensor 2 (intake sensor):

    If the threshold is exceeded in a switching module, only that module is shut down.

    If the threshold is exceeded in an active supervisor module with HA-standby or standby present, only that supervisor module is shut down and the standby supervisor module takes over.

    If you do not have a standby supervisor module in your switch, you have an interval of 2 minutes to decrease the temperature. During this interval the software monitors the temperature every five (5) seconds and continuously sends system messages as configured.

    Tip

    To realize the benefits of these built-in automatic sensors on any switch in the Cisco MDS 9500 Series, we highly recommend that you install dual supervisor modules. If you are using a Cisco MDS 9000 Family switch without dual supervisor modules, we recommend that you immediately replace the fan module if even one fan is not working.

Hot-swappable fan modules (fan trays) are provided in all switches in the Cisco MDS 9000 Family to manage airflow and cooling for the entire switch. Each fan module contains multiple fans to provide redundancy. The switch can continue functioning in the following situations:

• One or more fans fail within a fan module—Even with multiple fan failures, switches in the Cisco MDS 9000 Family can continue functioning. When a fan fails within a module, the functioning fans in the module increase their speed to compensate for the failed fan(s).

• The fan module is removed for replacement—The fan module is designed to be removed and replaced while the system is operating without presenting an electrical hazard or damage to the system. When replacing a failed fan module in a running switch, be sure to replace the new fan module within five minutes.

Note	If one or more fans fail within a fan module, the Fan Status LED turns red. A fan failure could lead to temperature alarms if not corrected immediately.

The fan status is continuously monitored by the Cisco MDS NX-OS software. In case of a fan failure, the following action is taken:

• System messages are displayed.

• Call Home alerts are sent (if configured).

• SNMP notifications are sent (if configured).

Use the show environment fan command to display the fan module status.

This example shows the chassis fan information.

switch# show environment fan
------------------------------------------------------
Fan             Model                Hw         Status
------------------------------------------------------
Chassis         DS-9SLOT-FAN         1.2        ok
PS-1            --                   --         ok
PS-2            --                   --         absent

The possible Status field values for a fan module on the Cisco MDS 9500 Series switches are as follows:

• If the fan module is operating properly, the status is ok.

• If the fan is physically absent, the status is absent.

• If the fan is physically present but not working properly, the status is failure.

On the Cisco MDS 9513 Director, the front fan module has 15 fans. If the front fan module (DS-13SLT-FAN-F) State field contains "failure" in the show environment fan command output, it also displays the numbers of the failing fans.

This example shows a Cisco MDS 9513 front fan module failure.

switch# show environment fan
------------------------------------------------------
Fan             Model                Hw         Status
------------------------------------------------------
Chassis         DS-13SLT-FAN-F       0.3        failure 3 5 6 13 
Chassis         DS-13SLT-FAN-R       0.3        ok
PS-1            --                   --         ok
PS-2            --                   --         ok

Figure 1. Cisco MDS 9513 Front Fan Module Numbering. This figure shows the numbering of the fans in the front fan module on the Cisco MDS 9513 Director.

The rear fan module (DS-13SLT-FAN-R) on the Cisco MDS 9513 Director has only two fans. If a fan in the rear fan module fails, the State field in the show environment fan command output only displays "failure" and not the failing fan number.

This example shows a fan module failure on a Cisco MDS 9513 Director.

switch# show environment fan
------------------------------------------------------
Fan             Model                Hw         Status
------------------------------------------------------
Chassis         DS-13SLT-FAN-F       0.3        ok 
Chassis         DS-13SLT-FAN-R       0.3        failure 
PS-1            --                   --         ok 
PS-2            --                   --         ok 

All switches in the Cisco MDS 9000 Family have two clock modules: Module A (primary) and Module B (redundant). The clock modules are designed, tested, and qualified for mission-critical availability with a mean time between failures (MTBF) of 3,660,316 hours. This translates to a potential failure every 365 years. Additionally, Cisco MDS 9000 Family switches are designed to automatically switch to the redundant clock module should the active clock module fail.

Tip	We recommend that you replace a failed clock module during a maintenance window.

Use the show environment clock command to display the status for both clock modules.

This example shows clock module information.

switch# show environment clock
----------------------------------------------------------
Clock           Model                Hw         Status
----------------------------------------------------------
A               DS-C9500-CL          0.0        ok/active
B               DS-C9500-CL          0.0        ok/standby

Use the show environment command to display all environment-related switch information.

switch# show environment 
Clock:
----------------------------------------------------------
Clock           Model                Hw         Status        
----------------------------------------------------------
A               Clock Module         1.0        ok/active
B               Clock Module         1.0        ok/standby

Fan:
------------------------------------------------------
FAN             Model                Hw         Status         
------------------------------------------------------
Chassis         DS-2SLOT-FAN         0.0        ok             
PS-1            --                   --         ok             
PS-2            --                   --         absent 
Temperature:
---------------------------------------------------------------
Module   Sensor   MajorThresh   MinorThres   CurTemp     Status
                  (Celsius)     (Celsius)    (Celsius)         
---------------------------------------------------------------
1        1        75            60           32          ok
1        2        65            50           32          ok
1        3        -127          -127         43          ok
1        4        -127          -127         39          ok
Power Supply:
-----------------------------------------------------
PS  Model                Power     Power       Status
                         (Watts)   (Amp @42V)        
-----------------------------------------------------
1   PWR-950-AC           919.38    21.89       ok                  
2                        --        --          absent 
Mod Model                Power     Power       Power     Power       Status
                         Requested Requested   Allocated Allocated         
                         (Watts)   (Amp @42V)  (Watts)   (Amp @42V)        
--- -------------------  -------   ----------  --------- ----------  ----------
1    DS-X9216-K9-SUP     220.08    5.24        220.08    5.24        powered-up
Power Usage Summary:
--------------------
Power Supply redundancy mode:                   redundant
Total Power Capacity                            919.38   W
Power reserved for Supervisor(s)[-]             220.08   W
Power reserved for Fan Module(s)[-]             0.00     W
Power currently used by Modules[-]              0.00     W
                                                -------
Total Power Available                           699.30   W
                                                -------