
72 DS8800 Performance Monitoring and Tuning
If the same extent pool is specified and rotate extents is used as the EAM, the volume
migration is carried out as
manual volume rebalance, as described in “Manual volume
rebalance” on page 63.
Manual volume rebalance is designed to redistribute the extents of
volumes within a non-managed, single-tier (homogeneous) pool so that workload skew and
hot spots are less likely to occur on the ranks. During extent relocation, only one extent at a
time is allocated rather than preallocating the full volume and only a minimum amount of free
capacity is required in the extent pool.
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