Release 6.0 56
User Guide Chapter 1 Overview
1.3.1.3 Notes on Powering On the Disk Array System
1. When powered on from the battery backup status
If the disk array system stopped due to an unexpected power outage, backed up cache data to the
internal flash memory, and then restarted, high-speed writing by using cache (Cache Fast Write) will
not be performed until charging the batteries used for the backup is complete, which makes
performance of the disk array system degrade. This is because next backup is not guaranteed while
batteries are not fully charged, and data is written to nonvolatile disk drives but not to caches that
may get volatilized.
It takes a maximum of eight hours to complete charging discharged batteries.
2. Restarting the disk array system after user data loss
If a loss of data in caches has been experienced and then the disk array controller is powered on,
the Service LED on the disk array unit repeats flashing for four seconds and then not lit for eight
seconds. Follow the steps below to start the disk array system
.
3 Do not operate the disk array system until the Power LED (green) located at the front of
the disk array unit is lit and the Service LED (orange) goes off after cyclic flashing.
4 Power on the application servers (hosts).
Step Operation
It takes approximately six (for minimum configuration) to eight (maximum
configuration) minutes for initialization and the self test after the power on.
During this period, the Service LED (orange) flashes cyclically.
If the Service LED (orange) does not go off and the Power LED (green) is
not lit after 10 minutes (both LEDs are located at the front of the disk array
unit), the disk array system may be failing.
See Chapter 10, "Troubleshooting" .
If the snapshot function or the data replication function is used,
initialization and the self test described above take longer.
Make sure to power on the application servers after the disk array system is
successfully started.
Step Operation
1 Perform power off according to the steps in Section 1.3.2: “Powering Off the Disk
Array System”.
2 Perform power on according to the steps in Section 1.3.1: “Powering On the Disk
Array System”.
If the disk array system does not start up successfully, it may be failing.
Performance of the disk array system degrades until battery charging is
complete, which takes a maximum of eight hours.
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