HP XP P9500 Storage - Manual (Page 39)

Calculating cache size for open systems
1. Calculate the converted values of the starting address and the ending address.
For all specified LDEVs:
1.
For OPEN-V:
Number of LBAs = LDEV size (KB)×2
Convert the LDEV size to the number of LBAs.
Number of slots = ceil (Number of LBA ÷ 512)
Round up the value that is calculated from the formula enclosed by ceil().
Converted value of starting address = 0
Converted value of ending address = (Number of slots × 512) - 1
2. For emulation types other than OPEN-V:
Number of LBAs = LDEV size (KB) × 2
Convert the LDEV size to the number of LBAs
Number of slots = ceil (Number of LBAs ÷ 96)
Round up the value that is calculated from the formula enclosed by ceil().
Converted value of starting address = 0
Converted value of ending address = (Number of slots × 96) - 1
If the volumes are specified:
1.
for OPEN-V:
Starting value = floor (Setting value of starting address (LBA) ÷ 512)
Round down the value that is calculated from the formula enclosed by floor(). "Setting
value of starting address (LBA)" is the value which is input on the Cache Residency
window.
Ending value = floor (Setting value of ending address (LBA) ÷ 512)
Round down the value that is calculated from the formula enclosed by floor(). "Setting
value of ending address (LBA)" is the value which is input on the Cache Residency window.
Converted value of starting address = Starting value × 512
Converted value of ending address = ((Ending value + 1) × 512) - 1
2. For emulation types other than OPEN-V:
Starting value = floor (Setting value of starting address (LBA) ÷ 96)
Round down the value that is calculated from the formula enclosed by floor(). "Setting
value of starting address (LBA)" is the value which is input on the Cache Residency
window.
Ending value = floor (Setting value of ending address (LBA) ÷ 96)
Round down the value that is calculated from the formula enclosed by floor(). "Setting
value of ending address (LBA)" is the value which is input on the Cache Residency window.
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 address and the ending address
calculated in step 1.
Calculating cache size for open systems 39