NEC M100, User Manual

Page: 60 / 459

Release 6.0
60
User Guide Chapter 1 Overview
1.3.2.2 Notes on Turning Off the AC Power
1. Backing up user data
If the power of this disk array system is turned off without going through the power off procedure
described in
Section 1.3.2: “Powering Off the Disk Array System” , or the power control systems
without using DC buttons section described in Section 1.3.1: “Powering On the Disk Array System”,
the user data on caches will be backed up on the flash memory of the unit.
Data will not be lost even if the power is turned off without going through the procedures.
2. Notes on using the data replication function
The update information (= storage system information) managed by the data replication function
(DynamicDataReplication or RemoteDataReplication) is created on a replication reserved volume
or the cache memory.
If no replication reserved volume has been created, the update information mentioned above is
created only on the cache memory. In these circumstances, even if the disk array system is
powered off according to the procedure described in
Section 1.3.2: “Powering Off the Disk Array
System” , the status of the disk array system becomes backup status when the disk array system is
stopped. If the backup fails, the storage system information is lost and the status of the disk array
system becomes one of the following six statuses.
Activity Synchronization Pair Status
Separate Separated All spaces are different. There is no change in
the status.
Separating The status becomes fault, where copying is
stopped.
Replicate Replicating All spaces are different. Replication is
automatically restarted from the beginning.
There is no change in the status.
Synchronized
Restore Restoring The status becomes fault, where copying is
stopped.
Synchronized All spaces are different. Replication is
automatically restarted from the beginning.
There is no change in the status.