544 DS8800 Performance Monitoring and Tuning
With the DS8000 supporting volume sizes up to 16 TiB and SAN Volume Controller 6.2+
levels supporting these MDisk sizes, a classical approach is still possible when using large
disks, such as with an array of the 3 TB nearline disks (RAID 6). The volume size in this case
is determined by the rank capacity.
With the modern approach of using large multi-rank extent pools, more clients use a standard
volume MDisk size, such as 2 TiB for all MDisks, with good results.
We suggest that you assign SAN Volume Controller DS8000 LUNs of all the same size for
each storage pool. In this configuration, the workload applied to a Virtual Disk is equally
balanced on the Managed Disks within the storage pool.
Dynamic ...