11.4.1 How to Take a SPARCstorage Array Tray Out of Service (Solstice DiskSuite)

Before removing a SPARCstorage Array tray, you must halt all I/O and spin down all drives in the tray. The drives automatically spin up if I/O requests are made, so it is necessary to stop all I/O before the drives are spun down.

These are the high-level steps to take a SPARCstorage Array tray out of service in a Solstice DiskSuite configuration:

• Switching logical hosts to one cluster node

• Stopping I/O to the affected tray

• Identifying any replicas, hot spares, and submirrors on the affected tray

• Flushing NVRAM data, if appropriate

• Spinning down and removing the tray

If the entire SPARCstorage Array is being serviced, you must perform these steps on each tray.

These are the detailed steps to take a SPARCstorage Array tray out of service in a Solstice DiskSuite configuration.

1. Switch ownership of the affected logical hosts to other nodes by using the haswitch(1M) command.

   phys-hahost1# haswitch phys-hahost1 hahost1 hahost2

   The SPARCstorage Array tray to be removed might contain disks included in more than one logical host. If this is the case, switch ownership of all logical hosts with disks using this tray to another node in the cluster. The luxadm(1M) command will be used later to spin down the disks. In this example, the haswitch(1M) command switched the logical hosts to phys-hahost1, enabling phys-hahost2 to perform the administrative functions.

2. Use the metastat(1M) command on all affected logical hosts to identify all submirrors containing slices on the tray to be removed.

   phys-hahost1# metastat -s disksetname

3. Stop I/O to the submirrors whose components (slices) are on the affected tray.

   Use the metaoffline(1M) command for this step. This takes the submirror offline. You can use the metadetach(1M) command to stop the I/O, but the resync cost is greater.

   When the submirrors on a tray are taken offline, the corresponding mirrors provide only one-way mirroring (that is, there will be no data redundancy). (A three-way mirror does not have this problem.) When the mirror is brought back online, an automatic resync occurs.

   With all affected submirrors offline, I/O to the tray is stopped.

4. Use the metadb(1M) command to identify any replicas on the tray.

   Save the metadb(1M) output to use when you replace the tray.

5. Use the metahs(1M) command to identify any available hot spare devices and associated submirrors.

   Save the metahs(1M) output to use when you replace the tray.

6. If NVRAM is enabled, flush the NVRAM data on the appropriate controller, tray, or disk(s).

   phys-hahost1# luxadm sync_cache pathname

   A confirmation appears, indicating that NVRAM data has been flushed. See "11.7.3 Flushing and Purging NVRAM", for details on flushing NVRAM data.

7. Spin down the tray using the luxadm stop command.

   When the tray lock light is out, remove the tray and perform the required service.

   phys-hahost1# luxadm stop c1