Terminating Services Module; Concentrator Services Module - Acer Altos S300 User Manual

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Terminating Services Module

The Terminating Services Module (TSM) has no external connectors and

as such cannot have cables connected to it. Instead it can either

terminate or join the SCSI busses based on the cable configuration on

the ESM. The TSM reports status and receives control information via

the SCSI bus per the SCSI-3 Enclosure Services specification and also the

SAF-TE specification.

The Concentrator Services Module (CSM) includes the same

functionality as the ESM, in addition to giving the enclosure Clustering

capabilities. With a CSM installed in one I/O Slot and either a CSM or a

TSM installed in the second I/O slot then a Cluster Configuration is

possible.

This means that each external SCSI connector can have 25 meters of

SCSI cable attached, with each cable connected from the I/O module to

a host. When a host is disconnected from the enclosure, the CSM

isolates the disconnected host from the internal storage and remaining

attached host. This means that one host can be taken "off-line"

without data disruption to the other host.

Note: For information on how to configure your Altos S300

series, see page 17.

1 Introduction

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