Procedure: Finding the status of SAS connections

Find the status of the SAS connections between canisters in different enclosures.

About this task

Ensure that the software is active on the node before you begin this procedure. To determine if the software is active, see Procedure: Understanding the system status from the LEDs.

Procedure

Determine the state of the SAS ports by using one of the following methods:

  • In the management GUI, select to Monitoring > System.
  • On the System - Overview page, select SAS Chain View to display the SAS ports. SAS ports that are not connected are displayed as offline.
    • It is normal for port 2 of the canisters in the expansion enclosure at the end of a SAS chain to be offline.
    • If no expansion enclosures are connected to a system, it is normal for port 4 of each canister in the control enclosure to be offline.
    Attention: The system can identify some SAS cabling errors and log an event to alert you to the error. Go to the Monitoring > Events page of the management GUI and identify alerts concerning hardware errors and SAS cabling errors. Run fix procedures in the recommended order.
  • Determine the meaning of the LEDs of the SAS ports, as described in Expansion canister ports and indicators.
    • If the link LED is off, the link is not connected.
    • If the fault LED is on, the link is partially operational, with reduced performance. Consider the state of any other link between the two enclosures before servicing this link.
  • To connect a link that is not connected, complete the following actions while checking the link status after each step until the link is connected:
    1. Ensure that both ends of each SAS cable are correctly inserted into their correct ports, as described in Problem: SAS cabling not valid.
    2. Replace the SAS cable, as described in Replacing a Storwize V7000 Gen2 expansion enclosure attachment SAS cable.
    3. Replace the expansion enclosure at one end of the connection.For information on replacing an expansion enclosure, see Replacing an expansion enclosure.
    4. Replace the node canister at the other end of the connection. If it is a Gen2 or Gen2+ node canister, see Replacing a Storwize V7000 Gen2 node canister. If it is a NextGen node canister, see Reseating a node canister in the control enclosure.