DS8000 Service Documentation Version 7.5

MAP5430 Host Fibre Channel fails to recognize DS8000 LUNs

You are here to resolve a host failure to recognize LUNs configured on a DS8000® Fibre Channel.

Before you begin

Note: Customer disruption may occur if microcode and power boundaries are not in the proper conditions for this service action. Verify that you start all service activities in Start here.
Related tasks:
How to start the service information center

MAP5430 Section-1

Procedure

  1. Use the management console to determine the current DS8000 Fibre Channel configuration and connections.
  2. Use the customization worksheets from the IBM DS8000 Introduction and Planning Guide for your model to verify the following:
    1. The DS8000 hardware configuration matches the customization worksheet.
    2. The Fibre Channel host cables are connected to the appropriate Fibre Channel host card and I/O enclosure. See the following figures.
    If you discover mismatches, check with the customer to resolve any differences.
    Figure 1. I/O enclosure Fibre Channel host card connector locations (Models 960/961)
    Model 951 location codes for the I/O enclosure fibre channel host card
    Figure 2. I/O enclosure Fibre Channel host card connector locations (Flash Systems 8870)
    I/O enclosure Fibre Channel host card connector locations

    Has the problem been resolved?

    • Yes, return to the procedure that sent you here.
    • No, continue with the next step.
  3. Verify the LUN access setting of the Control Switches:
    1. From the management console, select: Service Management > storage facility > SF image > Service Utilities > Enable/Disable Control Switches.
    Note: If the control switches are changed, the subsystem must be rebooted for the change to take effect.

    Is the Fibre Channel LUN Access Control set to Access_All?

    • Yes, have the customer check with the system administrator to verify that the host fibre configuration is correct.
    • No, continue with the next step.
  4. Has the problem been resolved?
    • Yes, return to the procedure that sent you here.
    • No, continue with the next step.
  5. Have the customer use DS8000 Storage Manager to verify the following:
    1. The proper hosts are defined as being attached to the DS8000.
    2. All the host fibre port configuration is correct and matches the customization worksheets.
    Are the hosts defined correctly?
    • Yes, have the customer check with the system administrator to verify that the host fibre configuration is correct. If there are fibre switches between the host and the DS8000, have the customer verify that any zoning within the switch is properly configured. This will allow the desired host to access the DS8000.
    • No, the customer must define the host configuration using the DS8000 Storage Manager.