Sun Microsystems Netra 1290, Руководство администратора

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96 Netra 1290 Server System Administration Guide • May 2006
Command-Line Interface
The Solaris
cfgadm
(1M) command provides the command-line interface for the
administration of DR functionality.
DR Concepts
Quiescence
During the unconfigure operation on a system board with permanent memory
(OpenBoot PROM or kernel memory), the operating system is briefly paused, which
is known as operating system quiescence. All operating system and device activity
on the backplane must cease during a critical phase of the operation.
Note –
Quiescence may take several minutes, depending on workload and system
configuration.
Before it can achieve quiescence, the operating system must temporarily suspend all
processes, CPUs, and device activities. It might take a few minutes to achieve
quiescence depending on system usage and activities currently in progress. If the
operating system cannot achieve quiescence, it displays the reasons, which might
include the following:
■
An execution thread did not suspend.
■
Real-time processes are running.
■
A device exists that cannot be paused by the operating system.
The conditions that cause processes to fail to suspend are generally temporary.
Examine the reasons for the failure. If the operating system encountered a transient
condition, a failure to suspend a process, you can try the operation again.
RPC or TCP Time-out or Loss of Connection
Time-outs occur by default after two minutes. Administrators might need to increase
this time-out value to avoid time-outs during a DR-induced operating system
quiescence, which might take longer than two minutes. Quiescing a system makes
the system and related network services unavailable for a period of time that can
exceed two minutes. These changes affect both the client and server machines.