Seagate ST336754SS - Cheetah 36.7 GB Hard Drive User Manual download pdf (Page 123)

iSCSI GbE to SAS/SATA II RAID Subsystem

User Manual

123

6.10.2 Ownership

When creating RG, it will be assigned with a prefered owner, the default owner is

controller 1. To change the RG ownership, please follow the procedures.

1. Select “/ Volume configuration / RAID group”.

2. Check the gray button next to the RG name; click “Set preferred owner”.

3. The ownership of the RG will be switched to the other controller.

The RG ownership is changed to the other controller.

6.10.3 Controller Status

There are four statuses described on the following. It can be found in “/ System

maintenance / System information”.

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 RG will switch to good one. For example: if

controller 1 which owns the RG1 fails accidently, the ownership of RG1 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 RGs 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.

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Seagate ST336754SS - Cheetah 36.7 GB Hard Drive User Manual Page 123