ExpressCluster X 2.0 for Windows Reference Guide - Nec

Chapter 12 Troubleshooting
Connecting mirror disks/hybrid disks manually
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This section describes how to cancel the access restriction for the data partition of mirror disk
resource or hybrid disk resource when you cannot start ExpressCluster due to some sort of
failure.
Normally connecting mirror disk when mirroring is available
When the ExpressCluster Server service can be activated while the ExpressCluster X Disk Agent
service cannot be, access restriction can be cancelled by following the steps below.
Run the following command on the server where you want to connect disks.
For mirror disks:
clpmdctrl --active
For hybrid disks:
clphdctrl --active
2. The mirror disk resource or hybrid disk resource becomes accessible. Written data is
mirrored to the other server.
Forcibly connecting mirror disk when mirroring is not available
Follow the steps below to save data on mirror disks when both the ExpressCluster Server service
and the ExpressCluster X Disk Agent service cannot be activated.
However, the mirroring status up to the moment just before both the ExpressCluster Server
service and the ExpressCluster X Disk Agent service became unable to be activated must be
normal, or you must know which server has the latest data.
1. Uninstall ExpressCluster from the server with the latest data, and restart the server.
Server 1 Server 2
Server that
contains
the latest
data
Unable to start
ExpressCluster
Unable to start
ExpressCluster
Mirror disk Mirror disk
2. Back up the data in the data partition on a DAT tape or other media.
Backup
device
Server 1 Server 2
Backup
command ExpressCluster X 2.0 for Windows Reference Guide