IBM Storwize V7000, Introduction And Implementation Manual

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Chapter 8. Storage pools
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This window provides the following information:
򐂰 MDisk name
򐂰 Numerical ID
򐂰 Status
򐂰 Capacity
򐂰 Mode
򐂰 Name of the storage pool it belongs to
򐂰 Pool ID
򐂰 Name of the backing storage system for MDisk on external storage
򐂰 MDisk’s LUN ID from external storage systems
򐂰 UID
򐂰 Assigned storage tier
Not all these values show by default, but can be enabled by right-clicking the blue bar above
the MDisk groups. You can find more information about attaching external storage to an IBM
Flex System V7000 Storage Node in Chapter 11, “SAN connections and configuration” on
page 457.
In IBM Flex System V7000 Storage Node, there are four modes for MDisks:
򐂰 Array: Array mode MDisks are constructed from internal drives using the RAID
functionality. Array MDisks are always associated with storage pools (also known as
MDisk Groups).
򐂰 Unmanaged: The MDisk is not a member of any storage pools, which means it is not being
used by IBM Flex System V7000 Storage Node. LUNs presented by external storage
systems to IBM Flex System V7000 Storage Node are discovered as unmanaged MDisks.
򐂰
Managed: The MDisk is assigned to a storage pool and provides extents to be used by
volumes.
򐂰 Image: The MDisk is assigned directly to a volume with a one-to-one mapping of extents
between the MDisk and the volume.
8.2.1 Adding MDisks to storage pools
By adding
unmanaged MDisks
to a pool, their status changes to
managed MDisks
. Managed
MDisks can belong to only one pool. Unmanaged MDisks can either be added to a new pool
or to an existing pool to expand its capacity. Pools are commonly used to group MDisks from
the same storage subsystem and with the same class of speed.
A new pool can be created in the MDisks by Pools window by clicking the New Pool icon.
Assign a name to the pool and choose an icon, if wanted (Figure 8-26).
Figure 8-26 Create storage pool - step 1