sap extension and Automounter/Auto FS Configuration

[anat heilper]

Hi,
I'm running sg 11.16 with the sap extension.
When does the auto FS mount the file systems during boot?

[Steven E. Protter]

Shalom,

/etc/rc.log

Soon after boot.

Also see /sbin/rc2.d

SEP

[Steven E. Protter]

Sorry, I misunderstood earlier.

Serviceguard packages generally do the following:

1) Activate the volume group on shared storage.
2) Mount any filesystems needed.

This is all done in the package control script.

Serviceguard is triggered in /sbin/rc3.d

SEP

[Duncan Edmonstone]

With AUTOFS, the filesystem won't get NFS mounted until a process tries to access a file on it. So in a SGeSAP cluster, this will be at the point when the startsap scripts are called.

So at boot time, the NFS mounts are active at all.

HTH

Duncan

[Geoff Wild]

Auto FS doesn't mount any file systems at boot - unless you write a script to do so.

mount

that will display automount file systems - and if you cd to them or ll them, then they will mount.

If the file system is exported/shared from serviceguard, then it will only be available when the package is running.


Rgds...Geoff

[Ralph Grothe]

As the others already have answered,
the automounter only mounts shares on demand.
So if no SAP proc is trying to access files from the share nothing gets mounted.

I am not sure what your objective is.
But maybe it's the same pain that I felt when I occasionally needed to integrate another SAP share to the exports, but didn't want to restart the package after having modified sap.conf for this minor task which didn't require a package restart at all.
On the other hand I found it hard to remember after long config change periods what exactly the SAP shares to be exported were and what options they used.
So I wrote this simple script that sources sap.conf (after having edited it) and reexports everything.

$ cat reexport.sh
#!/usr/bin/sh

SAPSYSTEMNAME=BlaBla
SAPCONF=/etc/cmcluster/$SAPSYSTEMNAME/sap.conf

if [ -f $SAPCONF ]; then
. $SAPCONF
else
echo "Cannot stat $SAPCONF"
exit 1
fi

echo "Unexporting $SAPSYSTEMNAME shares"
exportfs -uv ${SXFS[*]}
typeset -i i=0
while ((i<${#SXFS[*]}));do
[[ -z ${SXFS[$i]} ]] && continue
echo "Exporting $SAPSYSTEMNAME share ${SXFS[$i]}"
exportfs -v -i -o ${OPFS[$i]} ${SXFS[$i]}
((i+=1))
done

[Ralph Grothe]

Sorry, forgot the second half.
You also would need an automounter map
which usually becomes a direct map
in /etc/auto_direct (or whatever your auto_master refers to).
There you would add an entry similar to

/sapmnt/SAPSID pkg_virt_host:/export/sapmnt/SAPSID

[anat heilper]

thanks for your answers