Chapter 9. MetroCluster expansion cabling 135c. Compare the firmware information in the command output with the disk shelf firmwareinformation at the IBM N series support site to determine the most current disk shelffirmware version.13.The next step depends on how current the disk shelf firmware is:– If the firmware version in the command output is the same as or later than the mostcurrent version on the N series Support Site, no disk shelf firmware update is needed.Complete Steps 14 and 15.– If the firmware version in the command output is an earlier version than the mostcurrent version on the N series Support Site, you must update the disk shelf firmware.Complete Steps 14 - 16.14.Configure the system and enable licenses as needed by using the information aboutconfiguring an HA pair in the Data ONTAP High Availability and MetroClusterConfiguration Guide for 7-Mode.15.Boot the storage system and begin setup.16.In Step 13, if you had an earlier version of disk shelf firmware than the most currentversion on the N series Support Site, download the new disk shelf firmware file.9.2.3 Replacing SAS cables in a multipath HA configurationYou can nondisruptively replace SAS cables in a multipath HA configuration. The SAS cablesthat are described in this section include SAS copper and SAS optical cables.When you replace SAS cables, consider the following important points: Replacing a SAS cable means that you are replacing a cable by using the same ports for acontroller-to-shelf or shelf-to-shelf connection.Situations where you might want to replace a SAS cable can include when a cable fails, alonger cable is needed, or SAS optical cables are preferred instead of SAS copper cables. Disk shelves that are connected with SAS optical cables require a version of disk shelffirmware that supports SAS optical cables.Best practice is to update all disk shelves in the storage system with the latest version ofdisk shelf firmware. You cannot change any disks, disk shelves, or components of a controller module as partof these procedures.Complete the following steps to replace SAS cables:1. Verify that your stretch MetroCluster system is Multi-Path HA by running the followingcommand at the console of both controllers:sysconfigImportant: After your storage system is up and serving data, you cannot move SAScables (change the SAS ports to which a cable is connected) nondisruptively. If youmust correct system cabling, you can use a maintenance period to do so.Note: Do not revert disk shelf firmware to a version that does not support SAS opticalcables.
