test

Sun Cluster 2.2 System Administration Guide

Flushing and Purging NVRAM

The luxadm sync_cache command flushes any outstanding writes from NVRAM to the disk drive. If you get an error while flushing data, you must purge the data using the luxadm purge command. Purging data "throws away" any outstanding writes in NVRAM.

Caution - Caution -

Purging fast write data should be performed with caution, and only when a drive has failed, as it could result in the loss of data.

If the NVRAM battery is low, missing, or has failed, then NVRAM is non-functional and data is lost.

How to Flush and Purge NVRAM

These are the high-level steps to flush or purge all outstanding writes for the selected controller (and all disks) or individual writes from the NVRAM to disk:

These are the detailed steps to flush or purge NVRAM data.

  1. Identify the controller or the individual disk to flush or purge.

    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
Vendor:        SUN     
Product ID:    SSA110          
Product Rev:   1.0 
Firmware Rev:  3.9 
Serial Num:    000000779A16
Accumulate Performance Statistics: Enabled
phys-hahost1#

  2. Stop all I/O to the affected device.

    Solstice DiskSuite:

    VxVM:

  3. Flush or purge the NVRAM on a controller, tray, or individual disk.

    If you can access drives in the SPARCstorage Array, flush the NVRAM. Only purge the NVRAM if you can no longer access the SPARCstorage Array or disk.


    phys-hahost1# luxadm sync_cache pathname
or
phys-hahost1# luxadm purge pathname

    A confirmation appears, indicating that NVRAM has been flushed or purged.

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

    Solstice DiskSuite:

    VxVM: