1-8 Introduction
Hitachi Universal Storage Platform V/VM Configuration Guide for SGI
®
IRIX
®
Host Attachment
Table 1-3 Volume Usage for Device Categories
Category Device Type Volume
Usage
SCSI Disk
OPEN-x, OPEN-x VLL, OPEN-x*n LUSE, OPEN-x*n VLL
LUSE
(SCSI disk devices can also be used as raw devices. For
example, some database applications use raw devices.
File System*
FX
3390-3A/B/C
3390-3A/B/C VLL
OPEN-x for FXoto, OPEN-x VLL for FXoto
Raw Device
* The SCSI disk devices can also be used as raw devices (e.g., some database
applications use raw devices).
Note 3: The BIOS or HBA can sometimes change the device capacity. These
device capacities are calculated based on 1 MB = 1024
2
bytes rather than
1000
2
bytes.
Note 4: The number of blocks for a Virtual LVI/LUN volume is calculated as
follows:
# of blocks = (# of data cylinders) × (# of heads) × (# of sectors per
track)
(The number of sectors per track is 128 for OPEN-V and 96 for the other
emulation types.)
Example: For an OPEN-3 VLL volume with capacity = 37 MB:
# of blocks = (53 cylinders – see Note 3) × (15 heads) × (96 sectors
per track) = 76320
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