IBM Flex System V7000 Expansion Enclosure 4939H29 User Manual
Product codes
4939H29
8068ch02-HW Intro.fm
Draft Document for Review January 29, 2013 12:52 pm
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IBM Flex System V7000 Storage Node Introduction and Implementation Guide
be added to the storage pool. When an MDisk is added to the storage pool, the mode
changes from unmanaged to managed and vice versa when you remove it.
changes from unmanaged to managed and vice versa when you remove it.
Each MDisk in the storage pool is divided into a number of extents. The size of the extent is
selected by the administrator at creation time of the storage pool and cannot be changed
later. The size of the extent ranges from 16 MB up to 8 GB.
selected by the administrator at creation time of the storage pool and cannot be changed
later. The size of the extent ranges from 16 MB up to 8 GB.
The extent size has a direct impact on the maximum volume size and storage capacity of the
clustered system. A system can manage 4 million (4 x 1024 x 1024) extents. For example, a
system with a 16 MB extent size can manage up to 16 MB x 4 MB = 64 TB of storage.
clustered system. A system can manage 4 million (4 x 1024 x 1024) extents. For example, a
system with a 16 MB extent size can manage up to 16 MB x 4 MB = 64 TB of storage.
The effect of extent size on the maximum volume size is shown inTable 2-5, and lists the
extent size and the corresponding maximum clustered system size.
extent size and the corresponding maximum clustered system size.
Table 2-5 Maximum volume capacity by extent size
The effect of extent size on the maximum clustered system capacity is shown inTable 2-6.
Table 2-6 Extent size and effect on clustered system capacity
Extent size
Maximum volume capacity for normal
volumes (GB)
volumes (GB)
16
2048 (2 TB)
32
4096 (4 TB)
64
8192 (8 TB)
128
16384 (16 TB)
256
32768 (32 TB)
512
65536 (64 TB)
1024
131072 (128 TB)
2048
262144 (256 TB)
4096
528288 (512 TB)
8192
1056576 (1,024 TB)
Extent size
Maximum storage capacity of cluster
16 MB
64 TB
32 MB
128 TB
64 MB
256 TB
128 MB
512 TB
256 MB
1 PB
512 MB
2 PB
1024 MB
4 PB
2048 MB
8 PB
4096 MB
16 PB
8192 MB
32 PB