Introduction 1-9
Hitachi Universal Storage Platform V/VM Configuration Guide for SGI
®
IRIX
®
Host Attachment
Note 5: The number of data cylinders for a Virtual LVI/LUN volume is
calculated as follows (↑…↑ means that the value should be rounded up to the
next integer):
The number of data cylinders for an OPEN-x VLL volume = (except for OPEN-
V):
# of cylinders = ↑ (capacity (MB) × 1024/720 ↑
Example: For an OPEN-3 VLL volume with capacity = 37 MB:
# of cylinders = ↑37 × 1024/720↑ = ↑52.62↑
= 53 cylinders
The number of data cylinders for an OPEN-V VLL volume =
# of cylinders = ↑ (capacity (MB) specified by user) × 16/15 ↑
Example: For an OPEN-V VLL volume with capacity = 50 MB:
# of cylinders = ↑50 × 16/15↑ = ↑53.33↑ = 54 cylinders
The number of data cylinders for a VLL LUSE volume = (except for OPEN-V):
# of cylinders = ↑ (capacity (MB) × 1024/720 ↑ × n
Example: For an OPEN-3 VLL LUSE volume with capacity = 37 MB and n = 4:
# of cylinders = ↑37 × 1024/720↑ × 4 = ↑52.62↑ × 4 = 53 × 4 = 212
The number of data cylinders for an OPEN-V VLL LUSE volume =
# of cylinders = ↑ (capacity (MB) specified by user) × 16/15 ↑ × n
Example: For an OPEN-V VLL LUSE volume with capacity = 50 MB and n = 4:
# of cylinders = ↑50 × 16/15↑ × 4 = ↑53.33↑× 4 = 54 × 4 = 216
The number of data cylinders for a 3390-3A/C =
# of cylinders = (number of cylinders) + 9
The number of data cylinders for a 3390-3B VLL volume =
# of cylinders = (number of cylinders) + 7
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