Managing Shared Disks

Startup time

When you start up your SP system, the IBM Recoverable Virtual Shared Disk component does the following:

• Configures all defined virtual shared disks at system startup using cfgvsd -a. All the virtual shared disks on the nodes are in stopped state.
• When quorum is reached, the rvsd subsystem activates all virtual shared disks with servers in the active group.
  • All virtual shared disks on the active nodes that also have a server in the active group will be in the active state.
  • If an virtual shared disk's primary server node is in the active group, the primary will be the server for that virtual shared disk.
  • If an virtual shared disk's primary server is not in the active group but the secondary server is, the secondary will be the server for that virtual shared disk.
  • All virtual shared disks without a server in the active group will be in the stopped state.
• If quorum is lost, all the virtual shared disks are put into the stopped state. When quorum is active again, the virtual shared disks are put into appropriate states based on the list above.

The rvsd subsystem actively manages all configured virtual shared disks. The recovery scripts invoke the preparevsd, resumevsd, suspendvsd, stopvsd, varyonvg, and varyoffvg commands asynchronously and automatically in the background as virtual shared disk server nodes become active or fail.

If you have any script that issues any virtual shared disk command, you should disable it so it does not interfere with rvsd recovery. Do not issue any commands that change the state of virtual shared disks.

The commands you must not issue when the rvsd subsystem is running are:

cfgvsd

cfghsdvsd

preparevsd

resumevsd

startvsd

stopvsd

suspendvsd

Notes:

1. In order for the rvsd subsystem to be activated, there must be a quorum.

2. After you install your system, you can start the IBM Virtual Shared Disk and IBM Recoverable Virtual Shared Disk components with the ha_vsd reset command. See the ha_vsd reference page in the book PSSP: Command and Technical Reference, for the command syntax.