Using Serviceguard Extension for RAC, 6th Edition, April 2008

If you are using software mirroring for shared concurrent activation of Oracle RAC

data with MirrorDisk/UX and the mirrored disks are mounted in a high availability

disk enclosure, use the following steps to carry out offline replacement:

1. Make a note of the physical volume name of the failed mechanism (for example,

/dev/dsk/c2t3d0).

2. Deactivate the volume group on all nodes of the cluster:

# vgchange -a n vg_ops

3. Replace the bad disk mechanism with a good one.

4. From one node, initialize the volume group information on the good mechanism

using vgcfgrestore(1M), specifying the name of the volume group and the

name of the physical volume that is being replaced:

# vgcfgrestore /dev/vg_ops /dev/dsk/c2t3d0

5. Activate the volume group on one node in exclusive mode then deactivate the

volume group:

# vgchange -a e vg_ops

This will synchronize the stale logical volume mirrors. This step can be

time-consuming, depending on hardware characteristics and the amount of data.

6. Deactivate the volume group:

# vgchange -a n vg_ops

7. Activate the volume group on all the nodes in shared mode using vgchange -

a s:

# vgchange -a s vg_ops

Replacing a Lock Disk

Replacing a failed lock disk mechanism is the same as replacing a data disk. If you are

using a dedicated lock disk (one with no user data on it), then you need to issue only

one LVM command:

# vgcfgrestore /dev/vg_lock /dev/dsk/c2t1d0

After doing this, wait at least an hour, then review the syslog file for a message showing

that the lock disk is healthy again.

On-line Hardware Maintenance with In-line SCSI Terminator

Serviceguard allows on-line SCSI disk controller hardware repairs to all cluster nodes

if you use HP’s in-line terminator (C2980A) on nodes connected to the end of the shared

FW/SCSI bus. The in-line terminator cable is a 0.5 meter extension cable with the

terminator on the male end, which connects to the controller card for an external bus.

The in-line terminator is used instead of the termination pack that is attached to the

controller card and makes it possible to physically disconnect the node from the end

Replacing Disks 161