Installation guide

In this release, the SCSI/CAM driver can address a maximum of 64
buses, with up to 7 device targets for each bus, and a maximum of eight
logical unit numbers (LUNs) for each device target. According to these
limitations, SCSI/CAM can address a maximum of 3584 devices.
• Redundant Array of Independent Disks (RAID)
Refer to the following for complete information:
– Systems & Options Catalog
– Product description literature
– Web pages:
http://www.digital.com/products.html
http://www.storage.digital.com
• Disklabel command
The disklabel command specifies the partitions of a disk and their
starting block/sector number. The starting block/sector number of a
partition is defined by the partition.p_offset structure field,
which is an unsigned 32-bit value that supports up to 2 TB of addressing,
using a 512-byte block/sector size.
A.1.5 Device Limits
Tru64 UNIX supports a maximum of seven devices per SCSI bus (for
example, one host bus adapter and seven disks). The maximum number of
SCSI buses supported by a system depends on the platform, but the Tru64
UNIX operating system supports a maximum of 64 SCSI buses.
For all other device limits, see the Systems & Options Catalog.
A.1.6 Logical Storage Manager Limits
In this release, the Logical Storage Manager (LSM), supports a maximum of
768 disk groups and 256 disks, either in a disk group or across the system.
The LSM term volume refers to a virtual disk that represents an addressable
range of disk blocks. File system data or raw I/O can be directed to a
volume. This release supports a maximum of 1 TB of disk space in a disk
group or on a system, and a maximum volume size of 1 TB. The maximum
number of supported LSM volumes is 4093 for all disk groups in a system,
which includes 4091 nonsystem volumes and 2 system (root or swap)
volumes.
The LSM term plex refers to a physical disk or a set of disks that contain a
complete copy of a volume’s data. A mirrored volume consists of at least
two plexes. In this release, the maximum number of supported plexes per
volume is 8, and the maximum number of supported plexes per system is
A–4 System Limits