HP StorageWorks XP Remote Web Console Software - Manual (Page 14)

14 Cache LUN XP for the XP10000/XP12000
For specified volumes:
a. OPEN-V
Starting value = (↓Setting value of starting address (LBA) ÷ 512↓)
Round down the calculated value between the two down arrows (↓) after the decimal point
Setting value of starting address (LBA) is the value entered in the operations box on the Cache
LUN pane
Ending value = (↓Setting value of ending address (LBA) ÷ 512↓)
Round down the calculated value between the two down arrows (↓) after the decimal point
Setting value of ending address (LBA) is the value entered in the operations box on the Cache
LUN pane
Converted value of starting address = Starting value × 512
Converted value of ending address = ( (Ending value +1) × 512) - 1
b. Emulation types other than OPEN-V
Starting value = (↓Setting value of starting address (LBA) ÷ 96↓)
Round down the calculated value between the two down arrows (↓) after the decimal point
Setting value of starting address (LBA) is the value entered in the operations box on the Cache
LUN pane
Converted value of starting address = Starting value × 96
Converted value of ending address = ( (Ending value +1) × 96) - 1
2. Calculate the number of addresses between the starting and ending addresses calculated in step 1 .
a. OPEN-V
Number of address = Converted value of ending address - Converted value of starting address + 1
Calculate the number of LBAs used by the user data
b. Emulation types other than OPEN-V
Number of LBAs = Converted value of ending address - Converted value of starting address + 1
Calculate the number of LBAs used by the user data
Number of slots = Number of LBAs ÷ 96
Convert the number of LBAs to the number of slots
Number of addresses = Number of slots × 128
Convert the number of slots with 128 LBA
3. Calculate the required cache size according to the operation modes, or RAID levels, to use Cache
LUN XP.
a. Bind mode
RAID-1:
Required cache size = Number of addresses Ч (512 ч 16) Ч 2 ч 1,024
Units are KB
RAID types other than RAID-1:
Required cache size = Number of addresses Ч (512 ч 16) Ч 3 ч 1,024
Units are KB
b. Priority mode
Required cache size = Number of addresses Ч (512 ч 16) ч 1,024
Units are KB