Logical volumes:
The XIV Storage System presents logical volumes to hosts in the same manner as
conventional subsystems; however, both the granularity of logical volumes and the mapping
of logical volumes to physical disks differ:
Every logical volume consists of 1 MB (1024 KB) constructs of
data known as partitions.
The physical capacity associated with a logical volume is always a multiple of 17 GB
(decimal) because the volume spans all physical drives in the system due to the grid
nature of the architecture.
Although it is possible to present a block-designated logical volume to a host that is not a
multiple of 17 GB, the actual physical space that is allocated for the volume is always the
sum of the minimum number of 17 GB increments needed to meet the block-designated
capacity.
The XIV Storage System presents logical volumes to hosts in the same manner as
conventional subsystems; however, both the granularity of logical volumes and the mapping
of logical volumes to physical disks differ:
Every logical volume consists of 1 MB (1024 KB) constructs of
data known as partitions.
The physical capacity associated with a logical volume is always a multiple of 17 GB
(decimal) because the volume spans all physical drives in the system due to the grid
nature of the architecture.
Although it is possible to present a block-designated logical volume to a host that is not a
multiple of 17 GB, the actual physical space that is allocated for the volume is always the
sum of the minimum number of 17 GB increments needed to meet the block-designated
capacity.
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