HP CIFS Server 3.0d Administrator's Guide version A.02.02 (Edition 5)

Configuring HA HP CIFS
Special Notes for HA HP CIFS Server
Chapter 11250
Special Notes for HA HP CIFS Server
There are several areas of concern when implementing Samba in the
MC/ServiceGuard HA framework. These areas are described below:
• Client Applications
HA HP CIFS Server cannot guarantee that client applications with
open files on a HP CIFS Server share, or, applications launched from
HP CIFS Server shares, will transparently recover from a
switchover. In these instances there may be cases where the
application will need to be restarted and the files reopened as a
switchover is a logical shutdown and restart of the HP CIFS Server.
• File Locks
File locks are not preserved during failover. File locks are lost and
applications are not advised about any lost file locks.
• Print Jobs
If a failover occurs when a print job is in process, the job may be
printed twice or not at all, depending on the job state at the time of
the failover.
• Symbolic Links
If you have your Samba server configured with follow symlinks set to
yes and wide links set to yes, the defaults for these parameters, you
should be cautious.
Symbolic links in the shared directory trees may point to files outside
any shared directory. If the symbolic links point to files that are not
in logical shared volumes, then, after a failover occurs, the symbolic
link may point to a different file or no file. Keeping the targets of all
shared symbolic links synchronized with all MC/ServiceGuard nodes
at all times could be difficult in this situation.
Easier options would be to set wide links to no or to be sure that
every file or directory that you point to is on a logical shared volume.
• Security Files
An important security file is secrets.tdb. Machine account
information is among the important contents of this file. Since this
file will be updated periodically (as defined in smb.conf by machine