A-1
Appendix A
Features of Disk Array Unit
1.
Battery Backup
The disk array unit keeps memory data with battery while the power is off.
Accordingly, to make the power off for a period longer than the battery hold period, it is necessary to
write data remaining in cache memory by pressing the SHUTDOWN switch before powering off the
system. If the system is powered off without pressing the SHUTDOWN switch and the batteries
exceed the battery hold period in the backup state, the following operation will be done. In this case,
the cache data is lost. The data must be recovered from the backup data saved in magnetic tapes.
1)
At the first start, the SERVICE LED repeats 5-sec flashing/7-sec OFF. The disk array unit is
not started normally.
2)
The controller shows the following FAULT code.
02438413
3)
The disk array unit is started normally by turning the array controller off once and then on
again.
4)
It takes eight hours to charge battery at the longest.
2.
Repair Time
The repair time is set to 12 hours in default. The repair time can be set in the range from 0 (fastest) to
24 hours. Depending on the disk capacity, the repair may not be terminated within the defined time.
Without commands from the upper system, the repair operates in the fastest mode.
See "Individual Settings (Bind/Unbind of Logical Disk)" in "NEC Storage Series Configuration
Guide" for the use of the management software (WebSAM NEC Storage Manager).
