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Chapter 4. Virtualization concepts 71
The DS Storage Manager GUI guides the user to use the same RAID types in an extent pool.
As such, when an extent pool is defined, it must be assigned with the following attributes:
– Server affinity
–Extent type
–RAID type
The minimum number of extent pools is one; however, you would normally want at least two,
one assigned to server 0 and the other one assigned to server 1 so that both servers are
active. In an environment where FB and CKD are to go onto the DS6000 storage server, you
might want to define four extent pools, one FB pool for each server, and one CKD pool for
each server, to balance the capacity between the two servers. Of course you could also
define just one FB extent pool and assign it to one server, and define a CKD extent pool and
assign it to the other server. Additional extent pools may be desirable to segregate ranks with
different DDM types.
Ranks are organized in two
rank groups:
– Rank group 0 is controlled by server 0.
– Rank group 1 is controlled by server 1.
Figure 4-5 is an example of a mixed environment with CKD and FB extent pools.
Figure 4-5 Extent pools
You can expand extent pools by adding more ranks to an extent pool.
Important: You should balance your capacity between the two servers for optimal
performance.
1GB
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Server0
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Extent Pool CKD0
Extent Pool CKD1
Extent Pool FBtest
Extent Pool FBprod