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ONTAP MetroCluster

Hot add a SAS disk shelf to a stack of SAS disk shelves

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You can hot-add a disk shelf when you want to increase storage without any reduction in performance.

Step 1: Prepare to hot-add a SAS disk shelf

To prepare for hot-adding a SAS disk shelf, you need to download documents along with the disk drive and disk shelf firmware.

Before you begin

  • Verify that your system is a supported configuration and is running a supported version of ONTAP.

  • Verify that all disk drives and disk shelves in the system are running the latest firmware version.

    You might want to update the disk and shelf firmware throughout the MetroCluster configuration before you add shelves.

    Upgrade, revert, or downgrade

Note

A mix of IOM12 modules and IOM6 modules is supported within the same stack if your system is running a supported ONTAP version. To establish whether your ONTAP version supports shelf mixing, refer to the Interoperability Matrix Tool (IMT). If your version of ONTAP is not supported and you cannot upgrade or downgrade the IOM modules on the existing stack or the new shelf that is to be added to a supported combination of IOM modules, you need to do one of the following:

  • Start a new stack on a new SAS port (if supported by the bridge-pair).

  • Start a new stack on an additional bridge-pair.
Steps

  1. Download or view the following documents from the NetApp Support Site:

  2. Verify that the disk shelf you are hot-adding is supported.

    Interoperability Matrix Tool

  3. Download the latest disk and disk shelf firmware:

    Note In this step, you only complete the download portion of the instructions. You need to follow the steps in hot-add a disk shelf to install the disk shelf.

    1. Download the disk firmware and make a copy of the disk firmware instructions for reference later.

      NetApp Downloads: Disk Drive Firmware

    2. Download the disk shelf firmware and make a copy of the disk shelf firmware instructions for reference later.

      NetApp Downloads: Disk Shelf Firmware

Step 2: Hot-add a disk shelf

Use the following procedure to hot-add a disk shelf to a stack.

Before you begin

  • Verify that the system meets all of the requirements in Prepare to hot-add SAS disk shelves.

  • Verify that your environment meets one of the following scenarios before you hot-add a shelf:

    • You have two FibreBridge 7500N bridges connected to a stack of SAS disk shelves.

    • You have two FibreBridge 7600N bridges connected to a stack of SAS disk shelves.

    • You have one FibreBridge 7500N bridge and one FibreBridge 7600N bridge connected to a stack of SAS disk shelves.

About this task

  • This procedure is for hot-adding a disk shelf to the last disk shelf in a stack.

    This procedure is written with the assumption that the last disk shelf in a stack is connected from IOM A to bridge A and from IOM B to bridge B.

  • This is a nondisruptive procedure.

  • You should hot-add an equal number of disk shelves at each site.

  • If you are hot-adding more than one disk shelf, you must hot-add one disk shelf at a time.

    Each pair of FibreBridge 7500N or 7600N bridges can support up to four stacks.

Caution

Hot-adding a disk shelf requires you to update the disk drive firmware on the hot-added disk shelf by running the storage disk firmware update command in advanced mode. Running this command can be disruptive if the firmware on existing disk drives in your system is an older version.

If you insert a SAS cable into the wrong port, after you remove the cable from a SAS port, you must wait at least 120 seconds before plugging the cable into a different SAS port. If you fail to do so, the system will not recognize that you have moved the cable to a different port.
Steps

  1. Properly ground yourself.

  2. Verify disk shelf connectivity from the system console of either controller:

    sysconfig -v

    The output is similar to the following:

    • Each bridge on a separate line and under each FC port to which it is visible; for example, hot-adding a disk shelf to a set of FibreBridge 7500N bridges results in the following output:

      FC-to-SAS Bridge:
cisco_A_1-1:9.126L0: ATTO  FibreBridge7500N 2.10  FB7500N100189
cisco_A_1-2:1.126L0: ATTO  FibreBridge7500N 2.10  FB7500N100162

    • Each disk shelf on a separate line under each FC port to which it is visible:

      Shelf   0: IOM6  Firmware rev. IOM6 A: 0173 IOM6 B: 0173
Shelf   1: IOM6  Firmware rev. IOM6 A: 0173 IOM6 B: 0173

    • Each disk drive on a separate line under each FC port to which it is visible:

      cisco_A_1-1:9.126L1   : NETAPP   X421_HCOBD450A10 NA01 418.0GB (879097968 520B/sect)
cisco_A_1-1:9.126L2   : NETAPP   X421_HCOBD450A10 NA01 418.0GB (879097968 520B/sect)

  3. Check whether your system has disk auto-assignment enabled from the console of either controller:

    storage disk option show

    The auto-assignment policy is shown in the Auto Assign column.

    Node        BKg. FW. Upd.  Auto Copy   Auto Assign  Auto Assign Policy
----------  -------------  ----------  -----------  ------------------
node_A_1             on           on           on           default
node_A_2             on           on           on           default
2 entries were displayed.

  4. If your system does not have disk auto-assignment enabled, or if disk drives in the same stack are owned by both controllers, assign disk drives to the appropriate pools.

    Disk and aggregate management

    Note

    • If you are splitting a single stack of disk shelves between two controllers, disk auto-assignment must be disabled before you assign disk ownership; otherwise, when you assign any single disk drive, the remaining disk drives might be automatically assigned to the same controller and pool.

      The storage disk option modify -node <node-name> -autoassign off command disables disk autoassignment.

    • You cannot add drives to aggregates or volumes until after you have updated the disk drive and disk shelf firmware.

  5. Update the disk shelf firmware to the most current version by using the instructions for the downloaded firmware.

    You can run the commands in the procedure from the system console of either controller.

    NetApp Downloads: Disk Shelf Firmware

  6. Install and cable the disk shelf:

    Note Do not force a connector into a port. The mini-SAS cables are keyed; when oriented correctly into a SAS port, the SAS cable clicks into place and the disk shelf SAS port LNK LED illuminates green.For disk shelves, you insert a SAS cable connector with the pull tab oriented up (on the topside of the connector).

    1. Install the disk shelf, power it on, and set the shelf ID.

      The Installation Guide for your disk shelf model provides detailed information about installing disk shelves.

      Note You must power-cycle the disk shelf and keep the shelf IDs unique for each SAS disk shelf within the entire storage system.

    2. Disconnect the SAS cable from the IOM B port of the last shelf in the stack, and then reconnect it to the same port in the new shelf.

      The other end of this cable remains connected to bridge B.

    3. Daisy-chain the new disk shelf by cabling the new shelf IOM ports (of IOM A and IOM B) to the last shelf IOM ports (of IOM A and IOM B).

    The Installation Guide for your disk shelf model provides detailed information about daisy-chaining disk shelves.

  7. Update the disk drive firmware to the most current version from the system console.

    NetApp Downloads: Disk Drive Firmware

    1. Change to the advanced privilege level:
      set -privilege advanced

      You need to respond with y when prompted to continue into advanced mode and see the advanced mode prompt (*>).

    2. Update the disk drive firmware to the most current version from the system console:
      storage disk firmware update

    3. Return to the admin privilege level:
      set -privilege admin

    4. Repeat the previous substeps on the other controller.

  8. Verify the operation of the MetroCluster configuration in ONTAP:

    1. Check whether the system is multipathed:

      node run -node <node-name> sysconfig -a

    2. Check for any health alerts on both clusters:
      system health alert show

    3. Confirm the MetroCluster configuration and that the operational mode is normal:
      metrocluster show

    4. Perform a MetroCluster check:
      metrocluster check run

    5. Display the results of the MetroCluster check:

      metrocluster check show

    6. Check for any health alerts on the switches (if present):

      storage switch show

    7. Run Active IQ Config Advisor.

      NetApp Downloads: Config Advisor

    8. After running Config Advisor, review the tool's output and follow the recommendations in the output to address any issues discovered.

  9. If you are hot-adding more than one disk shelf, repeat the previous steps for each disk shelf that you are hot-adding.