mkfset - Creates a fileset in an existing AdvFS domain
/sbin/mkfset [-o argument] domain fileset
Specifies fileset options; valid arguments are:
frag -- Uses the frag file for files or file fragments
less than 8 kilobytes (default).
nofrag -- Disables the frag file for files or file
fragments less than 8 kilobytes.
Specifies the name of an existing AdvFS domain. Specifies
the name of the fileset to be created in the specified
domain.
The mkfset command creates an AdvFS fileset within an
existing domain. You can have more than one fileset in a
domain unless that fileset is enabled for the data management
API (DMAPI), then only one fileset is allowed in a
domain. You can mount and unmount each fileset independently
of the other filesets in the domain. You can assign
fileset quotas (block and file usage limits) to filesets.
A domain is not active until it has a mounted fileset.
The -o option with the frag argument causes files to be
fragged in the normal manner. The nofrag argument causes
files that normally would be fragged not to be.
The page size in AdvFS is 8 kilobytes. For small files
that are not an even multiple of 8 kilobytes in length,
the last partial page of data is stored in the fileset's
frag file. The use of the fragment file results in significant
disk space savings for filesets with many small
files. The trade-off for this efficient use of disk space
is degraded filesystem performance for these small files.
Disabling the fragment file trades excellent space efficiency
for improved filesystem performance.
Use the following commands to manipulate filesets: Displays
the filesets associated with a domain. Removes a
fileset (and all of its files) from the domain. Assigns a
new name to an existing fileset. Changes fileset
attributes; specifically fileset quotas.
For more information, see the reference pages for each
command.
You must be the root user to use this utility.
Each fileset within a domain must have a unique name of up
to 31 characters. All whitespace characters (tab, new
line, space and so on) and the / # : * ? characters are
invalid for fileset names.
If a file has a frag, persistent atomic-write data logging
cannot be activated for that file.
If a fileset is DMAPI-enabled it must be the only fileset
in a domain. If you try to create a fileset in a domain
where the existing fileset is DMAPI-enabled, you will
receive an error message. For more information on DMAPI,
see AdvFS Administration.
The following example creates two filesets, credit_fs and
debit_fs, within an existing domain called accts_dmn and
mounts one of them. # mkfset accts_dmn credit_fs # mkfset
accts_dmn debit_fs
To create a mount point directory for credit_fs,
enter: # mkdir /mnt/credit
To mount the newly created credit_fs fileset on the
/mnt/credit directory, enter: # mount -t advfs
accts_dmn#credit_fs /mnt/credit
You can add filesets to the /etc/fstab file in the
same manner that you add any file system. Once
added, filesets are mounted each time you reboot
the system. If you add the userquota and groupquota
parameters, filesets quotas are enabled. You can
set fileset quota limits with the chfsets command.
For example, to automatically mount the credit_fs
fileset, add the following line to the /etc/fstab
file:
accts_dmn#credit_fs /mnt/credit advfs
rq,userquota,groupquota 0 2 The following example
shows the message you get if you try to create more
than one fileset in a domain with an existing
DMAPI-enabled fileset: # mkfset dmn fset2
// A DMAPI-enabled fileset already exists in dmn
mkfset: error, A DMAPI-enabled fileset exists in
the domain A domain containing a DMAPI-enabled
fileset is limited to one fileset only.
Commands: chfsets(8), mkfdmn(8), renamefset(8), rmfset(8),
showfdmn(8), showfsets(8)
File Formats: advfs(4)
mkfset(8)
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