HP XP7 Performance for Open and Mainframe Systems User Guide (H6F56-96007)

Prestaging occurs under any of the following circumstances:
• When prestaging is performed using Cache Residency.
• When the storage system is powered on.
• When cache maintenance is performed.
Cache Residency system specifications
SpecificationItem
Mainframe systemOpen system
3390-1, 2, 3, 9, A, L, MOPEN-VSupported device emulation
types
3390-3A, 3B, 3COPEN-3, 8, 9, E, K, L
3390-9A, 9B, 9C
3390-LA, LB, LC
3390-MA, MB, MC
Virtual LVIVirtual LUNSupported volume types
Thin Provisioning Z*Thin Provisioning*
Smart Tiers Z*Smart Tiers*
At least one cache slot (or track): Equivalent
to 66 KB.
For OPEN-V, at least 512 LBAs:
Equivalent to 264 KB
Unit of cache area allocation
Up to 1 LDEV.For other than OPEN-V, at least 96
LBAs: Equivalent to 66 KB
Per storage system: 16,384Number of cache areas
Per LDEV: 4,096
Minimum 512 MBTotal cache capacity
*Prestaging is not supported for these volumes.
Estimating cache size for Cache Residency
This section describes and provides instructions for calculating the cache size required for Cache
Residency Manager operations on your HP XP7 Storage system.
• “Cache Residency cache areas” (page 75)
• “Cache size requirements” (page 75)
• “Calculating cache size for open systems” (page 76)
• “Calculating cache size for mainframe systems” (page 78)
74 Cache Residency Manager operations