11.7.2 How to Enable and Disable NVRAM (Sun Cluster 2.2 System Administration Guide)

Sun Cluster 2.2 System Administration Guide

11.7.2 How to Enable and Disable NVRAM

These are the high-level steps to enable or disable NVRAM:

Ensuring that you have a current backup of all data
Ensuring that you have root privilege
Identifying the controller or disk on which to enable or disable NVRAM
Stopping all I/O to the device
Enabling or disabling NVRAM
Bringing the device back up and resynchronizing the data

These are the detailed steps to enable or disable NVRAM.

Identify the controller, tray, or individual disk whose NVRAM is to be enabled or disabled.

You can use the luxadm(1M) command to display information for a specified controller, tray, or individual disk. For example, the following display identifies all of the disks on Controller c2.

phys-hahost1# luxadm display c2
                     SPARCstorage Array Configuration

 Controller path:
 /devices/iommu@f,e0000000/sbus@f,e0001000/SUNW,soc@0,0/SUNW,pln@a0000000,779a16:ctlr
                           DEVICE STATUS
       TRAY 1                 TRAY 2                 TRAY 3
 slot
 1     Drive: 0,0             Drive: 2,0             Drive: 4,0
 2     Drive: 0,1             Drive: 2,1             Drive: 4,1
 3     NO SELECT              NO SELECT              NO SELECT
 4     NO SELECT              NO SELECT              NO SELECT
 5     NO SELECT              NO SELECT              NO SELECT
 6     Drive: 1,0             Drive: 3,0             Drive: 5,0
 7     Drive: 1,1             NO SELECT              NO SELECT
 8     NO SELECT              NO SELECT              NO SELECT
 9     NO SELECT              NO SELECT              NO SELECT
 10    NO SELECT              NO SELECT              NO SELECT
                          CONTROLLER STATUS
 ...

Stop all I/O to the affected device.

Solstice DiskSuite:
- For a controller or tray, refer to the applicable steps in the procedure "11.4.1 How to Take a SPARCstorage Array Tray Out of Service (Solstice DiskSuite)".
- For a disk, refer to the applicable steps in the procedure "11.6.5 How to Replace a SPARCstorage Array Disk (Solstice DiskSuite)".
SSVM or CVM:
- For a controller or tray, refer to the applicable steps in the procedure "11.4.2 How to Take a SPARCstorage Array Tray Out of Service (SSVM or CVM)".
- For a disk, refer to the applicable steps in the procedure "11.6.6 How to Replace a SPARCstorage Array Disk (SSVM or CVM)".

Enable or disable fast write on the controller or individual disk.

Use one of the three options to the luxadm(1M) command, depending on whether you are enabling fast write for all writes, enabling fast write only for synchronous writes, or disabling fast write.
- -e enables fast write for all writes
- -c enables fast write for only synchronous writes
- -d disables fast write
The following example saves the NVRAM configuration across power cycles and enables fast write for all writes. See the luxadm(1M) man page for details on these options.
phys-hahost# luxadm fast_write -s -e pathname
A confirmation appears, indicating that fast write has been enabled.

Perform the steps needed to bring the component into normal operation under Sun Cluster.

Solstice DiskSuite:
- For a controller or tray, refer to the applicable steps in the procedure "11.4.3 How to Return a SPARCstorage Array Tray to Service (Solstice DiskSuite)".
- For a disk, refer to the applicable steps in the procedure "11.6.5 How to Replace a SPARCstorage Array Disk (Solstice DiskSuite)".
SSVM or CVM:
- For a controller or tray, refer to the applicable steps in the procedure "11.4.4 How to Return a SPARCstorage Array Tray to Service (SSVM or CVM)".
- For a disk, refer to the applicable steps in the procedure "11.6.6 How to Replace a SPARCstorage Array Disk (SSVM or CVM)".