Table 2 Select Target Service Set parameters
Description
Parameter
The name of the Service Set. There should be two for each
couplet in your cluster configuration.
Name
The status of the service set.
Status
This column is displayed when you create a new library
or share. It tells you how many devices you can still create
Available <devices> Remaining
for this service set. The maximum devices available
depends upon the amount of couplets in your configuration.
It is 48 for a single couplet.
Why are there two service sets for each couplet?
There are two service sets for each couplet installed in your HP B6000 rack to ensure resilience
and failover.
Each node in a couplet can run both service sets and each service set has its own set of service
processes and its own storage. Each service set is associated with:
•
a primary node, which is the node on which it will usually run
•
a secondary node, which is where it will run if its primary node fails
This allows each node to act as the secondary node for the main service set on the other. In the
event of failover, the service set moves transparently from the primary node to the secondary node.
And because each storage array in your couplet has two connections, one from each node, the
service set can still access its storage on the primary node even though it is now running on the
secondary node.
Maximum device considerations
There is a maximum of 48 virtual devices per service set. This number may be split across VTL,
NAS and Catalyst devices. The following table illustrates some possible configurations. For more
detailed examples refer to the HP B6000 Series Best Practices Guide.
Table 3 Maximum number of virtual devices per service set
Total number of devices
Catalyst
NAS
VTL
48 (maximum)
0
0
48
48 (maximum)
0
48
0
48 (maximum)
48
0
0
48 (maximum)
0
24
24
48 (maximum)
0
47
1
47 (less than maximum)
0
0
47
50 (more than maximum,
you will not be able to
create devices 49 and 50)
0
20
30
36 (less than maximum)
12
12
12
48 (maximum)
16
16
16
12 (less than maximum)
3
5
4
14
B6200 StoreOnce
