HP XP Racks - Manual (Page 44)

Open system Parameter
48,000 KB (50 cylinders) 36,000 KB (+ control cylinders) Minimum size for one Virtual LUN
volume
See “CV capacity by emulation type for
open systems” (page 44) .
See “CV capacity by emulation type for
open systems” (page 44) .
Maximum size for one Virtual
LUN volume
1 MB or 1 block (512 bytes) 1 MB or 1 block (512 bytes) Size increment
Anywhere Anywhere Disk location for Virtual LUN
volumes
CV capacity by emulation type for open systems
Number of control cylinders
(cyl) Maximum CV capacity Minimum CV capacity (CYL) Emulation type*
None Internal volume:
3,221,159,680 KB (2.99
TB) 48,000 KB (50 cyl) OPEN-V
External volume:
4,294,967,296 KB (4 TB)
5,760 KB (8 cyl) 2,403,360 KB 36,000 KB (50 cyl) OPEN-3
19,440 KB (27 cyl) 7,175,520 KB 36,000 KB (50 cyl) OPEN-8
19,440 KB (27 cyl) 7,211,520 KB 36,000 KB (50 cyl) OPEN-9
13,680 KB (19 cyl) 14,226,480 KB 36,000 KB (50 cyl) OPEN-E
*Virtual LUN operations are not available for OPEN-L volumes.
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 LUN support SSID requirement Controller emulation type
OPEN-3, OPEN-8, OPEN-9,OPEN-E, and OPEN-V
volumes 0004 to FEFF I-2107
Virtual LUN 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
44 Configuring custom-sized provisioning