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NAMErpc.statd —
host status monitoring daemon
SYNOPSIS
DESCRIPTIONTherpc.statd utility is a daemon which co-operates with
rpc.statd daemons on other hosts to provide a status
monitoring service. The daemon accepts requests from programs running on the
local host (typically,
rpc.lockd(8),
the NFS file locking daemon) to monitor the status of specified hosts. If a
monitored host crashes and restarts, the remote daemon will notify the local
daemon, which in turn will notify the local program(s) which requested the
monitoring service. Conversely, if this host crashes and re-starts, when the
rpc.statd re-starts, it will notify all of the hosts
which were being monitored at the time of the crash.
The following option is available:
The FILES
SEE ALSOsyslog(3), rc(8), rpc.lockd(8)STANDARDSThe implementation is based on the specification in X/Open CAE Specification C218, "Protocols for X/Open PC Interworking: XNFS, Issue 4", ISBN 1 872630 66 9BUGSThere is no means for the daemon to tell when a monitored host has disappeared permanently (e.g. catastrophic hardware failure), as opposed to transient failure of the host or an intermediate router. At present, it will re-try notification attempts at frequent intervals for 10 minutes, then hourly, and finally gives up after 24 hours.The protocol requires that symmetric monitor requests are made to both the local and remote daemon in order to establish a monitored relationship. This is convenient for the NFS locking protocol, but probably reduces the usefulness of the monitoring system for other applications. The current implementation uses more than 1Kbyte per monitored host in the status file (and also in VM). This may be inefficient for NFS servers with large numbers of clients.
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