Configuring HP-UX For Peripherals

Chapter 6 173
Configuring Magneto-Optical Devices
Planning to Configure a Magneto-Optical Device
the drives are used. Other commands (such as raw access with cpio or
dd) will wait (sleep) until a drive is available.
Understanding Magneto-Optical Media Capacity
Magneto-optical disk mechanisms support several different capacities:
• C17 xx A and C17 xx C products support 1X capacity disks.
• C17 xx T and C11 xx A products support 1X and 2X capacity disks.
• C11 xx F, C11 xx G, and C11 xx H products support 4X capacity disks.
• C11 xx J, C11 xx K, and C11 xx L products support 8X capacity disks.
HP-UX supports disks with 512, 1024, or 2048 bytes per sector, for 1X,
2X, 4X, and 8X capacity. Disks with more bytes per sector give more
storage space per disk, due to a smaller amount of sector overhead.
You can determine the media by executing the diskinfo command.
diskinfo output for magneto-optical disks shows the information for the
specific surface queried, not for the disk as a whole. The size in this
example corresponds to the number of bytes on one surface of a
1X-capacity magneto-optical disk, with a sector size of 1024 bytes. (A
2X-capacity magneto-optical disk would show 581668 Kbytes.)
/usr/sbin/diskinfo /dev/rac/c0t1d0_4a
SCSI describe of /dev/rac/c0t1d0_4a:
vendor: HP
product id: C1716T
type: optical memory
size: 314568 Kbytes
bytes per sector: 1024
Table 6-1 Magneto-Optical Media Capacity by Size
Sector Size
Total Size
1X Capacity
Total Size
2X Capacity
Total Size
4X Capacity
Total Size 8X
Capacity
512 bytes 600 MB 1.2 GB 2.3 GB 4.2 GB
1024 bytes 650 MB 1.3 GB 2.6 GB 4.8 GB
2048 bytes - - - 5.2 GB