IBM DS8700, Введение и руководство по планированию

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v The creation of virtual ranks
The thin provisioning LIC feature key data contains the following information:
v
A storage-type indication that determines the type of storage that is applicable
for the LIC feature key
v A capacity value that refers to the total amount of physical capacity that is
configured into any real rank for the storage types on the storage facility image
For the thin provisioning LIC feature key to be valid, the capacity value must meet
all of the following criteria:
v The specified storage type must be fixed block (FB)
v
The specified capacity must be either zero or the maximum capacity value
The support of FB thin provisioning depends on the model. If thin provisioning is
not supported on all supported storage types, the LIC feature key must still
indicate both storage types. A request to create either an extent space-efficient
logical volume or a virtual rank in a storage type that is not supported is rejected.
Subsequent changes to storage types that are supported do not require a new LIC
feature key to be installed. Support of thin provisioning is only indicated to the
host types that access storage types that provide support for thin provisioning.
When a thin provisioning LIC feature key is installed, if the thin provisioning
facility is not currently enabled and the LIC feature key has a capacity greater than
0 bytes, the storage facility image enables the thin provisioning facility and notifies
any attached hosts through the appropriate interface protocol to single this
condition. If there are one or more extent space-efficient logical volumes configured
on the storage facility image and the installed LIC feature key is disabled while the
thin provisioning facility is enabled, the LIC feature key is rejected. Otherwise, the
following occurs:
v
The disablement LIC feature key is accepted
v The thin provisioning facility is immediately disabled
v
Any capabilities that were previously enabled for the thin provisioning facility
are disabled
Note: If a capability is enabled by some other LIC feature key, it remains
enabled.
v
All attached hosts are notified through the appropriate interface protocol that the
thin provisioning facility is disabled
If configuration-based enforcement is in effect while the thin provisioning facility is
enabled by a LIC feature key, the configuration of additional real ranks of the
specified storage types is suppressed on the storage facility image if the resulting
storage facility image physical capacity of the specified storage types can exceed
the amount that is allowed by the LIC feature key.
Feature codes for thin provisioning
Use either of these feature codes when you add the IBM System Storage DS8000
Thin Provisioning function to an existing or new storage unit.
Table 49. License function indicators for the Thin Provisioning feature
License function
Hardware machine type
239x indicator feature Hardware machine type 242x
indicator feature
Thin Provisioning
Indicator 7071 0707
Chapter 5. Use of licensed functions
137