Example--Putting a Disk Device Group in Maintenance State

This example shows how to put disk device group dg-schost-1 into maintenance state, and remove the disk device group from maintenance state.

[Place the disk device group in maintenance state.]
# scswitch -m -D dg-schost-1
 
[If needed, manually import the diskset or disk group.]
For Solstice DiskSuite/Solaris Volume Manager:
  # metaset -C take -f -s dg-schost-1
For VERITAS Volume Manager:
  # vxdg -t import dg1
  
[Complete all necessary repair procedures.]
  
[Release ownership.]
For Solstice DiskSuite/Solaris Volume Manager:
  # metaset -C release -s dg-schost-1
For VERITAS Volume Manager:
  # vxdg deport dg1
  
[Bring the disk device group online.]
# scswitch -z -D dg-schost-1 -h phys-schost-1

Administering Cluster File Systems

The cluster file system is a globally available file system that can be read and accessed from any node of the cluster.

Table 4-3 Task Map: Administering Cluster File Systems

How to Add a Cluster File System

Perform this task for each cluster file system you create after your initial Sun Cluster installation.

Caution - Be sure you specify the correct disk device name. Creating a cluster file system destroys any data on the disks. If you specify the wrong device name, you will erase data that you may not intend to delete.

The prerequisites to add an additional cluster file system are:

• Superuser privilege on a node in the cluster.

• Volume manager software must be installed and configured on the cluster.

• A device group (Solstice DiskSuite/Solaris Volume Manager device group or a VxVM device group) or block disk slice must exist, upon which to create the cluster file system.

If you used SunPlex Manger to install data services, one or more cluster file systems already exist if there were sufficient shared disks on which to create the cluster file systems.

1. Become superuser on any node in the cluster.

   ---

   Tip - For faster file system creation, become superuser on the current primary of the global device for which you are creating a file system.

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2. Create a file system using the newfs command.

   ---

   Note - The newfs command is only valid for creating new UFS file systems. To create a new VxFS file system, follow procedures provided in your VxFS documentation

   ---

   # newfs raw-disk-device

   
   

   The following table shows examples of names for the raw-disk-device argument. Note that naming conventions differ for each volume manager.

   Table 4-4 Sample Raw Disk Device Names

   If Your Volume Manager Is ...	A Disk Device Name Might Be ...	Description
   Solstice DiskSuite/Solaris Volume Manager	/dev/md/oracle/rdsk/d1	Raw disk device d1 within the oracle diskset.
   SPARC: VERITAS Volume Manager	/dev/vx/rdsk/oradg/vol01	Raw disk device vol01 within the oradg disk group.
   None	/dev/global/rdsk/d1s3	Raw disk device for block slice d1s3.

3. On each node in the cluster, create a mount point directory for the cluster file system.

   A mount point is required on each node, even if the cluster file system will not be accessed on that node.

   ---

   Tip - For ease of administration, create the mount point in the /global/device-group directory. Using this location enables you to easily distinguish cluster file systems, which are globally available, from local file systems.

   ---

   # mkdir -p /global/device-group/mountpoint

   
   

   device-group	Name of the directory that corresponds to the name of the device group that contains the device.
   mountpoint	Name of the directory on which to mount the cluster file system.

4. On each node in the cluster, add an entry to the /etc/vfstab file for the mount point.

   1. Use the following required mount options.

      ---

      Note - Logging is required for all cluster file systems.

      ---

      • Solaris UFS logging - Use the global,logging mount options. See the mount_ufs(1M) man page for more information about UFS mount options.

        ---

        Note - The syncdir mount option is not required for UFS cluster file systems. If you specify syncdir, you are guaranteed POSIX-compliant file system behavior. If you do not, you will have the same behavior that is seen with UFS file systems. When you do not specify syncdir, performance of writes that allocate disk blocks, such as when appending data to a file, can significantly improve. However, in some cases, without syncdir you would not discover an out-of-space condition until you close a file. The cases in which you could have problems if you do not specify syncdir are rare. With syncdir (and POSIX behavior), the out-of-space condition would be discovered before the close.

        ---

      • Solstice DiskSuite/Solaris Volume Manager trans metadevice or transactional volume- Use the global mount option (do not use the logging mount option). See your Solstice DiskSuite/Solaris Volume Manager documentation for information about setting up trans metadevices and transactional volumes.

        ---

        Note - Transactional volumes are scheduled to be removed from the Solaris operating environment in an upcoming Solaris release. Solaris UFS logging, available since the Solaris 8 release, provides the same capabilities but superior performance, as well as lower system administration requirements and overhead.

        ---

      • VxFS logging - Use the global and log mount options. See the mount_vxfs man page that is provided with VxFS software for more information.

   2. To automatically mount the cluster file system, set the mount at boot field to yes.

   3. Ensure that, for each cluster file system, the information in its /etc/vfstab entry is identical on each node.

   4. Ensure that the entries in each node's /etc/vfstab file list devices in the same order.

   5. Check the boot order dependencies of the file systems.

      For example, consider the scenario where phys-schost-1 mounts disk device d0 on /global/oracle, and phys-schost-2 mounts disk device d1 on /global/oracle/logs. With this configuration, phys-schost-2 can boot and mount /global/oracle/logs only after phys-schost-1 boots and mounts /global/oracle.

   See the vfstab(4) man page for details.

5. On any node in the cluster, verify that mount points exist and /etc/vfstab file entries are correct on all nodes of the cluster.

   # sccheck

   
   

   If there are no errors, nothing is returned.

6. From any node in the cluster, mount the cluster file system.

   # mount /global/device-group/mountpoint

   
   

7. On each node of the cluster, verify that the cluster file system is mounted.

   You can use either the df or mount command to list mounted file systems.

   To manage a VxFS cluster file system in a Sun Cluster environment, run administrative commands only from the primary node on which the VxFS cluster file system is mounted.