4-6 Dell PowerVault 720N, 740N, and 760N System Administrator and Command Reference Guide
It is important to distinguish between the kind of user-specified traps you can set
using the snmp traps command, and the built-in support for traps, such as cold-
start. Built-in traps such as cold start are automatically sent to the hosts on the
traphosts list when some event (a reboot in the case of a cold start) occurs. User-
specified traps only exist after they are defined by a series of snmp traps
commands.
Traps are persistent. After you set a trap, it remains across reboots until you specifi-
cally remove it.
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The filer resolves host names by searching maps or databases for services to use.
The filer tries name resolution services in a default order or in the order that you spec-
ify in the /etc/nsswitch.conf file in the root volume.
interval-offset The interval offset is the amount of time in seconds
until the first trap evaluation, and is zero by default.
You can set it to a non-zero value to prevent too
many traps from being evaluated at once (at sys-
tem startup, for example).
backoff-
calculator After a trap sends data, you might not want it to be
evaluated so often anymore. For instance, you
might want to know within a minute of when a file
system is full, but only want to be notified every
hour that it is still full. There are two kinds of back-
off calculators: stepwise and exponential.
backoff-step The number of seconds to increase the evaluation
interval if you are using a step backoff. If a traps
interval is 10 and its backoff-step is 3590, the trap is
evaluated every 10 seconds until it sends data, and
once an hour thereafter.
backoff-
multiplier The value by which to multiply a traps evaluation
interval each time it fires. If you set the backoff cal-
culator to exponential-backoff and the backoff
multiplier to 2, the interval doubles each time the
trap fires.

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