Regular managers and specialized managers, Failover managers – HP LeftHand P4000 Virtual SAN Appliance Software User Manual
Page 108
Table 33 Managers and quorum
Explanation
Fault tolerance
Number for a quorum
Number of Managers
If the manager fails, no data
control takes place. This
None
1
1
arrangement is not
recommended.
Even number of managers
not recommended, except in
None
2
2
specific configurations.
Contact Customer Support
for more information.
If one manager fails, 2
remain, so there is still a
High
2
3
quorum. (Note: 2 managers
are not fault tolerant. See
above.)
Even number of managers
not recommended, except in
High
3
4
specific configurations.
Contact Customer Support
for more information.
If one or two managers fail,
3 remain so there is still a
quorum.
High
3
5
Regular managers and specialized managers
Regular managers run on storage systems in a management group. The SAN/iQ software has two
other types of specialized managers, Failover Managers and Virtual Managers, described below.
For detailed information about specialized managers and the how to use them, see
specialized managers” (page 121)
Failover Managers
The Failover Manager is used in two-system and in Multi-Site SAN configurations to support
automatic quorum management in the SAN. Configuring a Failover Manager in the management
group enables the SAN to have automated failover without requiring a regular manager running
on a storage system. A Failover Manager runs as a virtual machine on a VMware Server or on
ESX and must be installed on network hardware other than the storage systems in the SAN.
shows the Failover Manager installed, configured, and appearing in the
CMC.
Figure 43 Failover Manager in the available systems pool
108 Working with management groups