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  man pages->Tru64 Unix man pages -> chfsets (8)              



NAME    [Toc]    [Back]

       chfsets - Changes attributes of AdvFS filesets

SYNOPSIS    [Toc]    [Back]

       /sbin/chfsets  [-F limit] [-f limit] [-B limit] [-b limit]
       [-o arg[,arg]] domain [fileset...]

OPTIONS    [Toc]    [Back]

       Specifies the block usage soft limit (quota) in 1 kilobyte
       blocks  of  the  fileset.   Specifies the block usage hard
       limit (quota) in 1 kilobyte 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 kilobytes (default).

              nofrag -- Disables the frag file for files or  file
              fragments less than 8 kilobytes.

              objectsafety  -- Enables object safety in the fileset
 to prevent object reuse.

              noobjectsafety -- Disables  object  safety  in  the
              fileset  (default).

              dmapi  -- Enables a fileset for data management API

              nodmapi -- Disables a fileset for DMAPI  (default).

OPERANDS    [Toc]    [Back]

       Specifies the name of an existing AdvFS domain.  Specifies
       the name of one or more filesets.

DESCRIPTION    [Toc]    [Back]

       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 explanation 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 edquota command.

       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 filesystem 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 zerofilled
 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.

RESTRICTIONS    [Toc]    [Back]

       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 Administration.

       The /, /usr, and  /var  filesets  cannot  be  enabled  for

       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 manage primary storage.

       To use the DMAPI argument, the system must have the  AdvFS
       Utilities license.

EXAMPLES    [Toc]    [Back]

       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

       The  following example turns fragging on for the credit_fs
       fileset  in  the  account_dmn  domain  and  displays   its
       attributes: # chfsets -o frag account_dmn credit_fs

       # 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

EXIT STATUS    [Toc]    [Back]

       The utility returns a 0 (zero) on success and a 1 (one) on

SEE ALSO    [Toc]    [Back]

       Commands:  chfile(8), df(1), edquota(8), quotaon(8),  quotaoff(8), showfdmn(8), showfsets(8)

[ Back ]
 Similar pages
Name OS Title
mountlist Tru64 Checks for mounted AdvFS filesets
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