HP StoreEver MSL6480 Tape Library - Manual (Page 20)

5 Configuring failover for the HP StoreEver ESL G3 Tape
Libraries
Configuring data path failover
When basic data path failover is enabled, the drive is presented on the first drive Fibre Channel
port, by default, and the second Fibre Channel port is a passive port. If the primary port goes
down, the library transfers various settings over to the passive port and then enables the failover
port. When advanced path failover is enabled, the drive is presented to the host over both SANs
and the host driver determines the active path.
Prerequisites for basic and advanced data path failover:
•
The HP StoreEver ESL G3 Data Path Failover license must be installed on the library.
•
The host must have a physical path to both the first port and secondary port on the FC drive.
Additional prerequisites for basic data path failover:
•
Only LTO-5 and LTO-6 Fibre Channel tape drives support basic data path failover.
•
The library must be attached to a Fibre Channel SAN that supports NPIV.
•
The drive port Fibre Channel topology must be in Fabric mode.
•
All paths to the Fibre Channel drive must be accessible from the same HBA and all of the
devices need to be within the same zone.
•
If Secure Manager is enabled, hosts that need access to the control path must be given robotics
device access to the first Fibre Channel port on both the active control path drive and the
standby control path drive.
Additional prerequisites for advanced data path failover.
•
Only LTO-6 Fibre Channel tape drives support advanced data path failover.
•
Host drivers need to be configured on all hosts. The hosts that do not have advanced path
failover drivers will see the drives but will not be able to write, read, or send move commands.
The advanced path failure drivers also support drives configured with basic path failover or
without failover configured.
•
If Secure Manager is enabled, hosts that need access to the control path must be given robotics
device access to all Fibre Channel ports on both the active control path drive and the standby
control path drive. The host will have two different worldwide names for the two different
HBAs and each worldwide name may be granted access to all ports or one name may be
granted access to the first Fibre Channel port and the second name may be granted access
to the second Fibre Channel port.
NOTE: For increased fault tolerance, select two drives that have less common library infrastructure
for the active and passive control path drives. For example, if you choose drive 1 as the active
drive, choose a passive drive in another cluster or library module.
Enabling data path failover
To enable data path failover:
1.
Log into the Management Console as a user with Administrator privileges.
2. Select the Physical managed view.
3. Select Setup > Partitions > Data Path Failover.
4. The Data Path Failover (DPF) dialog appears and displays all LTO-5 and LTO-6 drives. You
can filter the list by partition. Select the drives for which you want to enable advanced data
path failover (ADPF) or basic data path failover (BDPF), and then click OK.
20 Configuring failover for the HP StoreEver ESL G3 Tape Libraries