Serv er0, Serv er1, Rank – IBM TotalStorage DS6000 Series User Manual

Page 95: Groups

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Chapter 4. Virtualization concepts

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
FB

Serv

er0

1113
Cyl.
CKD

Serv

er1

1113
Cyl.
CKD

1GB
FB

1113
Cyl.
CKD

1GB
FB

Extent Pool CKD0

Extent Pool CKD1

Extent Pool FBtest

Extent Pool FBprod

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