File systems

Local (JFS/JFS2) filesystems

/ (root), /var and /tmp should be at least 64MB (131072 512-byte blocks) in size for AIX <=5.1, and 128MB, 512MB and 512MB, respectively, for AIX >=5.2. The amount of necessary paging space depends on the nature of the applications. The installation default may suffice, but for memory hogs one should consider paging space about as large as the machine's RAM.
The /tmp filesystem should be cleaned on a daily basis, edit /var/spool/cron/crontabs/root or use

   crontab -e

to insert

   0 3 * * * /usr/sbin/skulker >/dev/null # obsolete

   0 3 * * * /opt/bin/scavenger -t+1 /tmp >/dev/null

which will cleanup at 3 AM.

/opt

This filesystem usually holds optional software, mostly freeware. It is created automatically during installation of AIX>=5.1. On earlier versions one has to create it manually on rootvg with a size of 64MB, better 128MB:

   smitty storage: Logical Volumes - Add a Logical Volume 
   smitty storage: Filesystems - Add / Change / Show / Delete File Systems
   smitty storage: Filesystems - Add / Change / Show / Delete File Systems
   smitty storage: Filesystems - Mount a File System

or per command line

   mklv -y'hd10opt' -t'jfs' rootvg 1               # 1 partition to start with
   crfs -v jfs -d'hd10opt' -m'/opt' -p'rw' -A yes  # filesystem with default parameters
   chfs -a size='262144' /opt                      # increase it to 128MB      
   mount /dev/hd10opt /opt                         # mount it

Remote filesystems, mounted via automounter

There are user, scratch and data filesystems, as well as freeware and commercial applications.

Prepare links and directories,

   rm /u     # it's only a softlink to /home 
   mkdir /u

At GSI:

   mkdir /nfs
   ln -s /nfs/clri6c/cern      /cern
   ln -s /nfs/clri6c/local.AIX /usr/local
   mkdir /bio
   ln -s /nfs/bio/local.AIX/52 /bio/local       # for AIX 5.2
   ln -s /nfs/bio/local.AIX/53 /bio/local       # for AIX 5.3
   ln -s /nfs/bio/local.AIX/61 /bio/local       # for AIX 6.1
   ln -s /nfs/bio/local.AIX/71 /bio/local       # for AIX 7.1

else:
```
   mkdir /nfs
```

Prepare the automounter files (the comments in the following should be omitted, their content belongs into the respective /etc/auto.* file)

GSI, AIX >= 5.1

/etc/auto_master for example looks like

   /u        /etc/auto.u       # $user        -rw,vers=3,proto=tcp biops5z:/userfs/userb01/$user (distributed by IT)
   /s        /etc/auto.s       # bio          -rw,bg,soft,intr,retry=10 biops5w:/fsscratch/bio
   /-        /etc/auto.d       # /d/bio       -rw,bg,soft,intr,retry=10 biops5w:/data/data014
                               # ...          more similar entries 
   /nfs/clri6c /etc/auto.nfs   # cern         -rw,vers=3,proto=tcp   clri6m:/usrlocal/cern
                               # local.AIX    -rw,vers=3,proto=tcp   clri6m:/usrlocal/local.AIX
                               # ...          more similar entries 
   /nfs/bio    /etc/auto.bio   # local.AIX    -ro,vers=3,proto=tcp biops5z:/applfs/applb00/AIX
   /-        /etc/auto.lxg0110 # /data.local  -rw,bg,soft,intr,retry=10   lxg0110:/data.local2
                               # ...          more similar entries 
   /-        /etc/auto.lxg0113 # /datalxg0113 -rw,bg,soft,intr,retry=10   lxg0113:/data.local1
   /-        /etc/auto.lxg0115 # /datalxg0115 -rw,bg,soft,intr,retry=10   lxg0115:/data.local1

If maps have changed, stop the automounter and restart:

stopsrc -s automountd; /usr/sbin/automount -m -v -f /etc/auto_master

otherwise:

AIX >= 4.3:
/etc/auto_master for example looks like:

   /-   /etc/auto.u          # direct map to allow new users in /u
                             # /u    -rw,soft,intr,retry=10 rs6kf:/userfs/AIX/POWER
                             # /c    -rw,soft,intr,retry=10 rs6kf:/userfs/COMMON
                             # /WWW  -rw,soft,intr,retry=10 rs6kf:/userfs/WWW
   /s   /etc/auto.s          # bio   -rw,soft,intr,retry=10 rs6kf:/scratch/bio
   /d   /etc/auto.d
                             # bio     -rw,soft,intr,retry=10 rs6kf:/datafs/bio
                             # depot   -rw,soft,intr,retry=10 rs6kf:/depotfs/
                             # swdepot -rw,soft,intr,retry=10 rs6kf:/swdepotfs/
                             # img     -rw,soft,intr,retry=10 rs6kf:/imgfs/
   /nfs /etc/auto.nfs
                             # local   -ro,soft,intr,retry=10 rs6kf:/applfs/applb01/AIX/POWER
                             # install -rw,soft,intr,retry=10 rs6kf:/applfs/applb01/AIX/POWER
                             # common  -rw,soft,intr,retry=10 rs6kf:/applfs/applb01/COMMON

If this file exists, the automount daemon will be started on boot automatically via /etc/rc.nfs.

AIX <= 4.2:
/etc/auto.master for example looks like:

   /-   /etc/auto.u          # direct map to allow new users in /u
                             # /u    -rw,soft,intr,retry=10 rs6kf:/userfs/AIX/POWER
                             # /c    -rw,soft,intr,retry=10 rs6kf:/userfs/COMMON
                             # /WWW  -rw,soft,intr,retry=10 rs6kf:/userfs/WWW
   /s   /etc/auto.s          # bio   -rw,soft,intr,retry=10 rs6kf:/scratch/bio
   /d   /etc/auto.d
                             # bio     -rw,soft,intr,retry=10 rs6kf:/datafs/bio
                             # depot   -rw,soft,intr,retry=10 rs6kf:/depotfs/
                             # swdepot -rw,soft,intr,retry=10 rs6kf:/swdepotfs/
                             # img     -rw,soft,intr,retry=10 rs6kf:/imgfs/
   /nfs /etc/auto.nfs
                             # local   -ro,soft,intr,retry=10 rs6kf:/applfs/applb01/AIX/POWER
                             # install -rw,soft,intr,retry=10 rs6kf:/applfs/applb01/AIX/POWER
                             # common  -rw,soft,intr,retry=10 rs6kf:/applfs/applb01/COMMON

Note that it might be necessary to explicitly fall back to an ancient NFS version by specifying vers=2 as mount option.
The automount daemon has to be started e.g. in /etc/rc.local:

   /usr/sbin/automount -f /etc/auto.master

Alternatively, it may be placed in /etc/inittab:

   automount:2:once:/usr/etc/automount -T -v >/dev/null 2>&1

Note that the automount daemon should not be terminated by kill -9, rather use kill -15 in order to allow cleanup.
Note further, that the NFS daemons (/etc/rc.nfs) have to be active in order for the automounter to work.

At GSI, for a new machine, the operating group (E.Stiel@gsi.de) has to be informed to regularly update the autofs (file /etc/auto.u) maps on this machine.

Last update: 8-May-2013, M.Kraemer

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