Module Details; Nonvolatile Storage - Juniper E SERIES BROADBAND SERVICES ROUTERS 11.3.X - E120 AND E320 HARDWARE GUIDE REV 9-29-2010 Hardware Manual

E120 and E320 11.3.x Hardware Guide
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Figure 5: Representative SRP Module

Module Details

An SRP module must be present for the router to boot. The routers support up to two
redundant SRP modules operating in an active/standby configuration. The redundant
SRP module takes control when a failover occurs. See "Redundancy Features" on page 13
and the E120 and E320 Module Guide for more SRP module information.
CAUTION: Do not remove the SRP module while the system is running, unless
you have properly issued the halt command. See JunosE System Basics
Configuration Guide, Chapter 6, Managing Modules for information about the
halt commands.
NOTE: You cannot use SRP modules of different capacities in the same
configuration. For example, you cannot install a SRP-100 module and a
SRP-320 module in the same router.
For details about installing SRP modules, see "Installing Modules" on page 25.

Nonvolatile Storage

Depending on the model, each SRP module has either two Type II PCMCIA nonvolatile
storage (NVS) cards or two ATA flash cards (0, 1). (See Figure 5 on page 8.) One card
is loaded with the system's software and configuration files while the other card holds
core dumps. The NVS cards in the active SRP module are designated disk0 and disk1.
The NVS cards in the redundant SRP module are designated standby-disk0 and
standby-disk1. The PCMCIA card is factory installed.
CAUTION: Before you insert or remove flash cards from a running router, we
strongly recommend that you halt the SRP module or shut down the router.
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