Managing Shared Disks

Summary of commands

Though IBM encourages you to use the IBM Virtual Shared Disk Perspective graphical user interface to relieve you of the more error prone command syntax, long command strings, and making sure to run them on all the right nodes, there are still times when you might have to use commands. For instance, you might have scripts which contain commands for managing your virtual shared disks. Also, there are some commands not directly available as an action. You can run any command from within the graphical user interface, using the Run Command action from the Nodes pane.

The syntax and complete descriptions of all commands in PSSP are in the book PSSP: Command and Technical Reference. The following summarizes the commands that are associated with managing shared disks:

Command

Purpose

cfghsd

Configures a hashed shared disk.

cfghsdvsd

Configures a hashed shared disk and the underlying virtual shared disks that comprise it and starts the virtual shared disks.

cfgvsd

Configures a virtual shared disk.

cksumvsd

Views and manipulates the IBM Virtual Shared Disk component's checksum parameters.

createhsd

Creates one hashed shared disk that encompasses two or more virtual shared disks.

createvsd

Creates a set of virtual shared disks, with their associated logical volumes, and puts information about them into the SDR.

ctlhsd

Sets the operational parameters for the Hashed Shared Disk subsystem on a node.

ctlvsd

Sets the operational parameters for the IBM Virtual Shared Disk subsystem on a node.

defhsd

Designates a node as either having or using a hashed shared disk.

defvsd

Designates a node as either having or using a virtual shared disk.

fencevsd

Prevents an application running on a node or group of nodes from accessing a virtual shared disk or group of virtual shared disks.

ha_vsd

Starts and restarts the IBM Recoverable Virtual Shared Disk subsystem. This includes configuring virtual shared disks and hashed shared disks as well as activating the recoverability subsystem.

ha.vsd

Queries and controls the activity of the rvsd subsystem of the IBM Recoverable Virtual Shared Disk component.

hc.vsd

Queries and controls the hc subsystem of the IBM Recoverable Virtual Shared Disk component.

hsdatalst

Displays hashed shared disk information for the virtual shared disk from the SDR.

hsdvts

Verifies that a hashed shared disk for a virtual shared disk has been correctly configured and it works.

lshsd

Displays configured hashed shared disk for a virtual shared disk and the characteristics.

lsvsd

Display configured virtual shared disks and the characteristics.

monitorvsd

Enable, disable, or list the virtual shared disks that will be monitored.

preparevsd

Makes a virtual shared disk available.

removehsd

Removes one or more hashed shared disks, the virtual shared disks associated with them, and the SDR information for virtual shared disks on the associated nodes.

removevsd

Removes a set of virtual shared disks that are not part of any hashed shared disk.

resumevsd

Activates an available virtual shared disk.

rvsdrestrict

Displays and sets which level of the IBM Recoverable Virtual Shared Disk software is to run when you have a system partition with mixed levels of the PSSP or IBM Recoverable Virtual Shared Disk software.

spvsd

Directly launches the IBM Virtual Shared Disk Perspective graphical user interface.

startvsd

Makes a virtual shared disk available and activates it.

stopvsd

Makes a virtual shared disk unavailable.

suspendvsd

Deactivates an available virtual shared disk.

ucfghsd

Makes a hashed shared disk unavailable.

ucfghsdvsd

Stops the virtual shared disks that comprise a hashed shared disk and makes the hashed shared disk and the virtual shared disks unavailable.

ucfgvsd

Makes a virtual shared disk unavailable.

undefhsd

Undefines a hashed shared disk.

undefvsd

Undefines a virtual shared disk.

unfencevsd

Gives applications running on a node or group of nodes access to a virtual shared disk or group of virtual shared disks that were previously fenced from applications running on those nodes.

updatehsd

Lets you change the option in the SDR that prevents overwriting the Logical Volume Control Block (LVCB) for specified hashed shared disks.

updatevsdnode

Changes the IBM Virtual Shared Disk subsystem options in the SDR.

updatevsdtab

Changes the IBM Virtual Shared Disk subsystem option to set cache or nocache in the SDR.

verparvsd

Verifies IBM Virtual Shared Disk system partitioning.

vsdatalst

Displays IBM Virtual Shared Disk system definition data from the SDR.

vsdchgserver

Switches the server function for one or more virtual shared disks from the node that is currently acting as the server node to the other.

vsddiag

Displays information about the status of virtual shared disks.

vsdelnode

Removes IBM Virtual Shared Disk information for a node or series of nodes from the SDR.

vsdelvg

Removes IBM Virtual Shared Disk global volume group information from the SDR.

vsdnode

Enters IBM Virtual Shared Disk information for a node or a series of nodes into the SDR.

vsdsklst

Produces output that shows you the disk resources used by the IBM Virtual Shared Disk subsystem across a system or system partition.

vsdvg

Defines a virtual shared disk global volume group.

vsdvgts

Reads the timestamp from the volume group descriptor area (VGDA) of the physical disks and sets the value in the SDR.

vsdvts

Verifies that the IBM Virtual Shared Disk component works.

Note:

The full path for all commands involved with managing virtual shared disks is /usr/lpp/csd/bin/ and the path for other PSSP commands is /usr/lpp/ssp/bin/. Appendix B, Single-node command and SMIT interfaces shows tasks that use some of these commands in a strategy of acting on one node at a time.