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Ownership
When creating a RAID group, it will be assigned with a prefered owner, the default owner is controller 1. To
change the ownership of the RAID group, please follow the procedures.
1.
In Volume Configuration -> RAID Group tab, selects a RAID group. And then click
▼
-> Change
Preferred Controller.
2.
Click OK to apply. The ownership of the RG will be switched to the other controller.
Controller Status
There are four statuses in dual controller. It is displayed at Status column in System Maintenance -> System
Information. Describe on the following.
1.
Normal: Dual controller mode. Both of controllers are functional.
2.
Degraded: Dual controller mode. When one controller fails or has been plugged out, the system will
turn to degraded. In this stage, I/O will force to write through for protecting data and the ownership of
RAID group will switch to good one. For example: if controller 1 which owns the RAID group 1 fails
accidently, the ownership of RAID group 1 will be switched to controller 2 automatically. And the
system and data can keep working well. After controller 1 is fixed or replaced, The current owner of
all RAID groups will be asigned back to their prefered owner.
3.
Lockdown: Dual controller mode. The firmware of two controllers is different or the size of memory of
two controllers is different. In this stage, only master controller can work and I/O will force to write
through for protecting data.
4.
Single: Single controller mode. In the stage, the controller must stay in slot A and MUX boards for
SATA drives are not necessary. The differences between single and degraded are described on the
following. There is no error message for inserted one controller only. I/O will not force to write through.
And there is no ownership of RAID group.
