Cisco MDS SanOS Troubleshooting Guide -- Managing Storage Services Modules
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This chapter describes how to manage the Storage Services Module (SSM) and provides information about SSI images.
Contents |
SSM Overview
The 32-port Fibre Channel Storage Services Module (SSM) for the Cisco MDS 9000 Family supports up to 32 Fibre Channel ports and provides distributed intelligent storage services.
 | Note: | Cisco MDS 9500 Series switches running Cisco MDS SAN-OS Release 2.0(2b) or later support the SSM module. |
The SSI image for the SSM is downloaded from the supervisor module. The image for an SSM can be specified using the SSI boot variable.
| Note: | The SSM can operate as a 32-port Fibre Channel switching module with the standard Cisco SAN-OS images for Release 2.1(2) or later. You need the SSI image if you use intelligent storage services. |
The following table lists the features supported for the SSM :
| Module | Cisco MDS SAN-OS Release | |||
|---|---|---|---|---|
| 2.0(1b) | 2.0(2b), 2.0(3), 2.0(4), and 2.0(4a) | 2.1(1a) | 2.1(2) and later | |
| SSM | None | Fibre Channel switching | Fibre Channel switching | Fibre Channel switching |
| Intelligent Storage Services | Intelligent Storage Services | Intelligent Storage Services | ||
| VSFN | VSFN | Nondisruptive upgrade for Fibre Channel switching traffic1 | ||
When you upgrade, or downgrade, the SSI boot image on an SSM, you might disrupt traffic through the module. The following table describes how updating the SSI boot image affects SSM traffic.
| Cisco MDS SAN-OS Release | Traffic Type | Disrupts Traffic? |
|---|---|---|
|
2.0(2b) through 2.1(1a) |
All |
Yes |
|
2.1(2) and later |
Layer 2 Fibre Channel switching only |
No1 |
|
Both Layer 2 Fibre Channel switching and Layer 3 Intelligent Storage Services (such as FCWA, NASB, SANTap, and ISAPI virtualization) |
Yes |
|
|
Layer 3 Intelligent Storage Services (such as FCWA, NASB, SANTap, ISAPI virtualization) only |
Yes |
