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 |
As shown in Table 3-2, Layer 3 Intelligent Storage Services traffic is disrupted when you update the SSI boot image. If you configure Layer 3 Intelligent Storage Services on your SSM, we recommend that you shut down these services before upgrading the SSI boot image. You can use dual fabric configuration to minimize the impact of shutting down Layer 3 services.
Initial Troubleshooting Checklist
Begin troubleshooting SSM issues by verifying that the following conditions are met:
|
Checklist |
Check off |
|---|---|
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Verify that the SSI boot variable is set. |
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Verify that the SSI image is present and pointed to by the SSI boot variable. |
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Verify that the EPLD version is 2.1(2) or later for nondisruptive layer-2 upgrades. |
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Verify that you have configured all SSM ports prior to upgrading to Cisco SAN-OS Release 3.0(1) or later. Do not use port mode auto. |
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Verify that you have the appropriate licensing. The SSM can operate as a 32-port Fibre Channel switching module with no additional licensing requirements. The SSM requires the Storage Services Enabler package to provision intelligent storage services on the module. |
