Installation guide

4093 (or 4091, if root and swap volumes are not used).
The LSM term subdisk refers to a contiguous portion of a physical disk that
can be striped or concatenated with other subdisks to form a plex. A
maximum of 4096 subdisks can be associated with one plex, and Compaq
supports 4096 subdisks in each disk group or on a system.
LSM object names (for example, volumes, plexes, subdisks, and disk
groups), volume attribute names (such as user and group), and dxlsm view
names are limited to 14 characters.
A.1.7 File System Limits
The file system limits are as follows:
• Advanced File System
The Advanced File System (AdvFS) term volume refers to a single
logical device, such as a disk, disk partition, or a logical volume. A file
domain is a named set of one or more volumes. A fileset is a named and
mountable logical file structure that is created in a domain. An active
fileset is a fileset that is currently mounted.
AdvFS supports a maximum fileset and file size of 16 TB minus 512 K, a
maximum of 255 active file domains for each system, and a maximum of
256 volumes for each domain. However, because a single disk failure in
a multivolume file domain can make the entire domain inaccessible,
Compaq recommends that you use a maximum of eight volumes in a file
domain.
Although Tru64 UNIX supports an unlimited number of filesets per
system, only 767 filesets can be mounted at one time. The maximum
number of files in a fileset is 2
31
and is limited by the tag that is used to
uniquely identify a file in a fileset. Because of a sequence number limit,
a tag can be used only 4096 times; therefore, the actual limit on files in a
fileset decreases over time.
Although AdvFS can support a page size larger than 13 bits, the
maximum size of an AdvFS file and fileset is 16 TB - 512 K (2
13
*2
31
),
with a 13-bit page size and a 31-bit page number.
AdvFS supports a maximum of 767 mounted filesets. However, each
active file domain has a hidden mounted fileset that must be counted
when determining the total number of mounted filesets. For example, if
you have an active file domain with two visibly mounted filesets, the file
domain actually has three mounted filesets.
The AdvFS verify utility cannot validate domains with more than 767
filesets.
System Limits A–5