HP 3PAR Remote Copy Software - Manual (Page 29)

2.13 Remote Copy Configuration
InForm OS Version 2.3.1 Remote Copy User’s Guide
Figure 2-6. Synchronous Long Distance Remote Copy - One Backup Server Failure
Upon restoration of InServ2, data is transferred from InServ1 to InServ2 and synchronous
mode Remote Copy is restored between InServ1 and InServ2.
In the event of an primary server failure, one of the backup servers (typically the backup server
sharing a synchronous Remote Copy connection with the primary server) assumes the role of
the primary server and the second backup server then serves as the backup of the new primary
system. The volume on the new primary server is updated periodically on the backup server. As
shown in Figure 2-7 , when the primary server InServ1 goes down, InServ2 becomes the
primary server and InServ3 becomes the backup server to InServ2.
InServ1
(primary server)
InServ2
(backup server)
InServ3
(backup server)
Synchronous
Mode
Prior to InServ2 Failure 1
2 InServ2 Failure
InServ2
(backup server)
InServ3
(backup server)
Primary
Volume
Group A
Secondary
Volume
Group A
1
Secondary
Volume
Group A
2
Secondary
Volume
Group A
1
Secondary
Volume
Group A
2
InServ1
(primary server)
Primary
Volume
Group A
Asynchronous
Mode Periodic
Asynchronous
Mode Periodic
(standby link)