test

Sun Cluster 3.0 5/02 Supplement

Installing and Configuring Solstice DiskSuite Software

The following information applies to this update release and all subsequent updates.

only -

For Sun Cluster 3.0 5/02 on the Solaris 9 operating environment, information and procedures for Solstice DiskSuite software apply as well to Solaris Volume Manager software unless alternative information for Solaris 9 is specified.

How to Set the Number of Metadevice Names and Disksets (5/02)

The following changes were introduced in the Sun Cluster 3.0 5/02 update release and applies to this update and all subsequent updates to Sun Cluster 3.0 software.

Metadevice-name maximum - The following are corrections to Step 1 and Step 2. The correct maximum number of metadevice names each Solstice DiskSuite (Solaris 8) diskset can have is 1024. For Solaris Volume Manager (Solaris 9), the maximum is 8192 metadevice names per diskset, as documented in the Sun Cluster 3.0 12/01 Software Installation Guide.

  1. Calculate the largest metadevice name you need for any diskset in the cluster.

    Each diskset can have a maximum of 1024 metadevice names. You will supply this calculated value for the nmd field.

    1. Calculate the quantity of metadevice names you need for each diskset.

      If you use local metadevices, ensure that each local metadevice name is unique throughout the cluster and does not use the same name as any device ID (DID) in the cluster.

      Tip ( only) -

      Choose a range of numbers to use exclusively for DID names and a range for each node to use exclusively for its local metadevice names. For example, DIDs would use names in the range from d1 to d100, local metadevices on node 1 would use names in the range from d100 to d199, local metadevices on node 2 would use d200 to d299, and so on.

    2. Determine the largest of the metadevice names to be used in any diskset.

      The quantity of metadevice names to set is based on the metadevice name value rather than on the actual quantity. For example, if your metadevice names range from d950 to d1000, Solstice DiskSuite software requires 1000 names, not 50.

  2. Calculate the total expected number of disksets in the cluster, then add one for private disk management.

    The cluster can have a maximum of 31 disksets, not including the diskset for private disk management. The default number of disksets is 4. You will supply this calculated value for the md_nsets field.

How to Create a Diskset (5/02)

The following change was introduced in the Sun Cluster 3.0 5/02 update release and applies to this update and all subsequent updates to Sun Cluster 3.0 software.

Perform this procedure for each diskset you create.

only -

If you used SunPlex Manager to install Solstice DiskSuite, one to three disksets might already exist. See "Using SunPlex Manager to Install Sun Cluster Software (5/02)" for information about the metasets created by SunPlex Manager.

  1. Do you intend to create more than three disksets in the cluster?

    • If yes, go to Step 2 to prepare the cluster for more than three disksets. Do this regardless of whether you are installing disksets for the first time or you are adding more disksets to a fully configured cluster.

    • If no, go to Step 6.

  2. Ensure that the value of the md_nsets variable is set high enough to accommodate the total number of disksets you intend to create in the cluster.

    1. On any node of the cluster, check the value of the md_nsets variable in the /kernel/drv/md.conf file.

    2. If the total number of disksets in the cluster will be greater than the existing value of md_nsets minus one, on each node increase the value of md_nsets to the desired value.

      The maximum permissible number of disksets is one less than the value of md_nsets. The maximum possible value of md_nsets is 32.

    3. Ensure that the /kernel/drv/md.conf file is identical on each node of the cluster.

      Caution - Caution -

      Failure to follow this guideline can result in serious Solstice DiskSuite errors and possible loss of data.

    4. From one node, shut down the cluster.


      # scshutdown -g0 -y

    5. Reboot each node of the cluster.


      ok> boot

  3. On each node in the cluster, run the devfsadm(1M) command.

    You can run this command on all nodes in the cluster at the same time.

  4. From one node of the cluster, run the scgdevs(1M) command.

  5. On each node, verify that the scgdevs command has completed before you attempt to create any disksets.

    The scgdevs command calls itself remotely on all nodes, even when the command is run from just one node. To determine whether the scgdevs command has completed processing, run the following command on each node of the cluster. 


    % ps -ef | grep scgdevs

  6. Ensure that the diskset you intend to create meets one of the following requirements.

    • If configured with exactly two disk strings, the diskset must connect to exactly two nodes and use exactly two mediator hosts, which must be the same two hosts used for the diskset. See "Mediators Overview" in the Sun Cluster 3.0 12/01 Software Installation Guide for details on how to set up mediators.

    • If configured with more than two disk strings, ensure that for any two disk strings S1 and S2, the sum of the number of disks on those strings exceeds the number of disks on the third string S3. Stated as a formula, the requirement is that count(S1) + count(S2) > count(S3).

  7. Ensure that root is a member of group 14. 


    # vi /etc/group
...
sysadmin::14:root
...

  8. Ensure that the local metadevice state database replicas exist.

    For instructions, see "How to Create Metadevice State Database Replicas" in the Sun Cluster 3.0 12/01 Software Installation Guide.

  9. Become superuser on the cluster node that will master the diskset.

  10. Create the diskset.

    This command also registers the diskset as a Sun Cluster disk device group.


    # metaset -s setname -a -h node1 node2
    -s setname

    Specifies the diskset name

    -a

    Adds (creates) the diskset

    -h node1

    Specifies the name of the primary node to master the diskset

    node2

    Specifies the name of the secondary node to master the diskset

  11. Verify the status of the new diskset.


    # metaset -s setname

  12. Add drives to the diskset.

    Go to "Adding Drives to a Diskset" in the Sun Cluster 3.0 12/01 Software Installation Guide.

Example-Creating a Diskset

The following command creates two disksets, dg-schost-1 and dg-schost-2, with the nodes phys-schost-1 and phys-schost-2 assigned as the potential primaries.


# metaset -s dg-schost-1 -a -h phys-schost-1 phys-schost-2
# metaset -s dg-schost-2 -a -h phys-schost-1 phys-schost-2