HP NonStop G-Series - Manual (Page 19)

ServerNet Nomadic Disk Overview
ServerNet Nomadic Disk User’s Guide— 425485-001
1 -3
Data Paths and Disk Drive Ownership Before a
Switchover
Data Paths and Disk Drive Ownership Before a Switchover
Figure 1-1 illustrates the active data paths before a switchover.
•
The thick solid lines designate active data paths, which are between the primary
node \PRI and the primary disk drives and mirror disk drives. The primary disk
drives are located with and owned by the primary node. The remote mirror disk
drives are owned by primary node, but located with the backup node \BCK for fault
tolerance.
•
Thinner lines indicate inactive data paths, which are between the backup node \BCK
and the primary and mirror disk drives.
Figure 1-1. Remote Mirroring Before Switchover
MSEB
MSEB
6760
6760
Processor
Enclosure
MSEB
MSEB
6760
6760
Processor
Enclosure
6760
6760
\PRI I/O
Enclosure
IOMF 2
IOMF 2
6760
6760
\BCK I/O
Enclosure
IOMF 2
IOMF 2
Switch
Module
1
2
3
4
1
2
3
4
Mirror
Disks
Switch
Module
1
2
3
4
1
2
3
4
Primary
Disks
VST100.vsd
\BCK