Nonvolatile Storage; Sfm Module - Juniper E120 - RELEASE 11.1.X HARDWARE GUIDE 3-25-2010 Hardware Manual

Chapter 1: E120 and E320 Overview
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 27.

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. Failure to do this
can result in file corruption in one or both cards. See "Replacing an NVS Card" on
page 72 for more information.

SFM Module

The switch fabric modules (SFMs) work with the SRP module to create a shared
memory fabric for the router. Each SFM module (Figure 6 on page 9) has its own
memory and power converter. Like the SRP module, the SFM module contains a
fabric system processor board (slice). See "Fabric Slices" on page 10.
NOTE: You must use a SRP module that corresponds with the fabric type (SFM
module) that is installed. For example, you can only use a SRP–100 module with a
SFM-100 module. You cannot use a SRP–100 module with a SFM-320 module.
Figure 6: SFM Module
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E120 and E320 Modules