Appendix G High Availability
568 September 2002 HPSS Installation Guide
Release 4.5, Revision 2
Theanswer to this problem will depend from site to site, but one good way to make this work is to
have a set of intermediate scripts between the crontab file and the commands it executes. These
scriptscould test for the existence of any prerequisite files and/or file systems and only execute the
associatedcommand if all the prerequisites are met. This is exactly the strategy we recommend for
the crontab entries for thesfs_backup_util in Section G.7: Metadata Backup Considerations on page
569.
G.6 Monitoring and Maintenance

G.6.1 clstat

Onequick way to get an overview of a cluster ’s current status is using /usr/sbin/cluster/clstat. This
utility will report on which nodes are currently a part of the cluster and what interfaces are
currently available on them (boot, service, standby). It can run in either ASCII mode or X mode
depending on what services are available and how it is invoked. Below is a sample ASCII output:
Figure H-17 sample output from ‘clstat -a’
Inorder for clstat to work, the clinfo daemon must be running. When cluster services are started,
there is an option to startclinfo or not. The default is not to start it, so it will have to be started
purposely in order forclstat to be utilized.
See theclstat man page for more information.