Ssid Requirements; Virtual Lvi Size Calculations; Calculating The Size Of A 3390-A Volume - HP XP7 User Manual

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.
Controller emulation type
I-2107

Virtual LVI 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.

Calculating the size of a 3390-A volume

To calculate the entire capacity of a CV, use the following formulas. For the
user-specified-CV-capacity, specify the capacity of the user area in a CV.
The resulting CV capacity is expressed in megabytes:
( ceil (user-specified-CV-capacity / 1113) * 1120 * 15 * capacity-of-a-slot ) / 1024
The value enclosed in ceil( ) must be rounded up to the nearest whole number.
The user-specified-CV-capacity is the capacity of the user area in a CV expressed
in cylinders.
The capacity-of-a-slot is expressed in kilobytes. The capacity-of-a-slot value
depends on volume emulation types (see
TIP:
To calculate the capacity of the CV of 3390-A, apply the multiples of 1,1 13 cylinders to
user-specified CV capacity in the upper formula. For instance, if you want to apply 1 cylinder
to user-specified CV capacity, apply 1,1 13 cylinders. If you want to apply 1,1 14 cylinders
to user-specified CV capacity, apply 2,226 cylinders.
In 3390-A, if a value is specified that exceeds 65,520 cylinders, the value is corrected to
multiples of 1,1 13 cylinders. For instance, if 65,521 is specified, 65,667 which is 59 times
1,1 13 cylinders appears.
36 Configuring custom-sized provisioning
SSID requirement
0004 to FEFF
"Capacity of a slot" (page
Virtual LVI Support
3390-3, 3390-3A, 3390-3B, 3390-3C, 3390-9,
3390-9A, 3390-9B, 3390-9C, 3390-L, 3390-LA,
3390-LB, 3390-LC, 3390-M, 3390-MA, 3390-MB,
3390-MC volumes
38)).