HP XP P9500 Storage - Manual (Page 36)

Number of control cylinders
(cyl) Maximum CV capacity (cyl) Minimum CV capacity
(cyl) Emulation type
to multiples of 1,113 cylinders. For instance, if 65,521 is specified, the value is changed to 65,667, which is 59
times 1,113 cylinders.
2. For 3390-A, for the Compatible FlashCopy SE volume, if you specify a value between 1 and 40,068 cylinders,
the free space whose size is the sum of the specified value and 252 cylinders is required. If you specify a value of
40,069 cylinders or more, the free space calculated by the following formula is required.
40,320 cylinders + the value rounded up after the decimal point of *A × 1,120 cylinders
where *A = (the specified value - 40,068) ÷ 1,113 cylinders
3. For 3390-V, the value specified in the Create LDEVs window is changed to a multiple of 44.8 cylinders (38,976
KB) and the resulting number of cylinders is truncated after the decimal point. For instance, if 10,000 is specified,
10,035 appears (224 times 44.8 cylinders is 10,035.2).
4. When the CV of 3390-V is registered to the pool of Thin Provisioning Z, 8 GB or more free space in the CV of
3390-V is necessary. When you create a CV of 3390-V, specify the capacity as more than 9,676 cylinders.
SSID requirements
The storage system is configured with one SSID (Storage System ID) for each group of 64 or 256
devices, so there are one or four SSIDs per CU image. Each SSID must be unique to each connected
host system. SSIDs are user-specified and are assigned during storage system installation in
hexadecimal format, from 0004 to FEFF.
The following table shows the relationship between controller emulation types and SSIDs.
Virtual LVI Support SSID requirement Controller emulation type
3390-3, 3390-3A, 3390-3B, 3390-3C, 3390-9,
3390-9A, 3390-9B, 3390-9C volumes 0004 to FEFF 2105, 2107
3380-3, 3380-3A, 3380-3B, 3380-3C, 3390-3,
3390-3A, 3390-3B, 3390-3C, 3390-3R, 3390-9, 0004 to FEFF 2105-F20, 2107
3390-9A, 3390-9B, 3390-9C, 3390-L, 3390-LA,
3390-LB, 3390-LC, 3390-M, 3390-MA, 3390-MB,
3390-MC volumes
VLL size calculations
When creating a CV, you can specify the capacity of each CV. However, rounding will produce
different values for the user-specified CV capacity and the actual entire CV capacity. To estimate
the actual capacity of a CV, use a mathematical formula. The following topics explain how to
calculate the user area capacity and the entire capacity of a CV.
The capacity of a CV or an LDEV consists of two types of capacity. One type is the user area
capacity that stores the user data. The second type is the capacities of all areas that are necessary
for an LDEV implementation including control information. The sum of these two types of capacities
is called the entire capacity.
Implemented LDEVs consume the entire capacity from the parity group capacity. Therefore, even
if the sum of user areas of multiple CVs and the user area of one CV are the same size, the
remaining free space generated when multiple CVs are created may be smaller than the free space
in the parity group when one CV is created.
Additionally, if the data protection level is set to the Enhanced mode on a SATA drive parity group,
you must calculate the entire capacity of all CVs in existence and the entire capacity of CVs in the
Enhanced mode of the data protection level.
When using RAID Manager, the specified size of CVs is created regardless of the capacity
calculation. Therefore, even if the same capacity size (for example, 1 TB) appears, the actual
capacity size might be different between the CVs created by RAID Manager and the CVs created
by Remote Web Console.
36 Configuring custom-sized provisioning