SNMP and MIBS
Simple Network Management Using Net-SNMP and ftlSNMP
8-25
Device Enumeration
See
Table 7-1
for information on the enumeration of hardware components for ftServer
systems running a supported Linux
distribution together with
Express Builder
.
ftServer System Operation State Management
Figure 8-2
illustrates the operational states and state changes in an ftServer system.
Figure 8-2. Operational State Management on ftServer Systems
The device physical states can be Empty, or an online state such as Simplex or Duplex.
A device can be administratively
Removed
, which the system then treats as an Empty
state. However, a Removed device can be restarted by administrative command, while
an
Empty
device is restarted by physical removal (if actually present) and insertion of
the device into a system slot.
The assigned state
Shot
is an automatically determined or managed state based on a
failure threshold or MTBF. A Shot state can be transitioned to an operational state by
bringing the device up automatically, or transitioned to Broken through a defined
system administrative process. A
Broken
device requires intervention: an administrator
can choose to return the device to service or may physically remove the device.
Another state is
Unknown
. The system will try to bring up any device and resolve it to
a known state, initializing it and performing diagnostics, and if diagnostics are passed,
Online
Unknown
State
Simplex | Duplex
Initializing
Diagnostics
Diagnostics_passed
Syncing
Shot
Break
Auto
Bring-
Up
Broken
M
TB
F
Admin
Command
Empty
Removed
Physical
Pull
Inse
rt
Admin
Command
Physi
cal
Pull
Ph
ys
ica
l
Pu
ll
