chfsets(8)chfsets(8)NAMEchfsets - Changes attributes of AdvFS filesets
/sbin/chfsets [-F limit] [-f limit] [-B limit] [-b limit] [-o
arg[,arg]] domain [fileset...]
Specifies the block usage soft limit (quota) in 1 kilobyte blocks of
the fileset. Specifies the block usage hard limit (quota) in 1 kilo‐
byte blocks of the fileset. Specifies the file usage soft limit
(quota) of the fileset. Specifies the file usage hard limit (quota) of
the fileset. Specifies fileset options; valid arguments are:
frag -- Uses a frag file for files or file fragments less than 8
nofrag -- Disables the frag file for files or file fragments
less than 8 kilobytes.
objectsafety -- Enables object safety in the fileset to prevent
noobjectsafety -- Disables object safety in the fileset
dmapi -- Enables a fileset for data management API (DMAPI).
nodmapi -- Disables a fileset for DMAPI (default).
Specifies the name of an existing AdvFS domain. Specifies the name of
one or more filesets.
The chfsets command enables you to change and display fileset quotas
(file usage limits and block usage limits) of any AdvFS fileset. It
also allows you to turn object safety, fragging, and DMAPI on and off
for the fileset.
The chfsets command without options executes the showfsets command
without options. Please refer to the showfsets manpage for an explana‐
tion of output.
Filesets can have both soft and hard disk storage and file limits.
When a hard limit is reached, no more disk space allocations or file
creations that would exceed the limit are allowed. The soft limit may
be exceeded for a period of time by setting a grace period with the
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 fragment 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 in degraded filesys‐
tem performance for these small files. Disabling the fragment file
trades excellent space efficiency for improved filesystem performance.
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. Existing files are not directly affected; files with
frags retain the frags. Subsequent operations on these files will cause
the files to use the option set. If the frag file is disabled, small
files will occupy more disk space.
The -o option with the objectsafety argument ensures that the pages on
disk belonging to the fileset will be zero-filled and forced to disk
before they are available to the files. The noobjectsafety argument
does not require that the zero-filled pages be forced to disk. If you
have not enabled object safety, and if the system crashes while the
file is being written, it may be possible to access the old data.
The -o option with the dmapi argument enables a fileset for the data
management API. The nodmapi argument disables a fileset for DMAPI. If a
DM application has already made on-disk changes to the given fileset,
-o nodmapi may not be allowed by chfsets. For more information on
DMAPI, see AdvFS Administration.
You must be the root user to run the chfsets command.
Only the root user can exceed fileset quotas.
If a file has frags, persistent atomic-write data logging is not
allowed. For more information, see the chfile manpage and AdvFS Admin‐
The /, /usr, and /var filesets cannot be enabled for DMAPI.
Filesets that are named root, usr, or var cannot be enabled for DMAPI.
If a fileset is DMAPI-enabled, it must be the only fileset in the
domain. This is to allow a DMAPI application to more effectively man‐
age primary storage.
To use the DMAPI argument, the system must have the AdvFS Utilities
The following example changes the file hard limit from 11 to 200 and
block hard limit from 121 to 1000 for the credit_fs fileset in the
account_dmn domain without displaying any output: # chfsets-b 1000 -f
200 account_dmn credit_fs
The following example turns fragging on for the credit_fs fileset in
the account_dmn domain and displays its attributes: # chfsets-o frag
# chfsets account_dmn credit_fs
Id : 3a3a6f24.000d15f4.3.8002
Files : 3,SLim= 0, HLim= 0
Blocks (512) : 48,SLim= 0, HLim= 0
Quota Status : user=off group=off
Object Safety : off
Fragging : on
DMAPI : off
The utility returns a 0 (zero) on success and a 1 (one) on failure.
Commands: chfile(8), df(1), edquota(8), quotaon(8), quotaoff(8),