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Copyright@2004~2014 Qsan Technology, Inc. All Rights Reserved.
Qsan Document – User Manual
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.
