User`s manual

To enable this option, the initiator can connect with “Data digest” and “Header

digest”.

Max Connections

The maximum number of iSCSI connections.

Error Recovery Level

The Error Recovery Level (ERL) is negotiated during a leading iSCSI connection

ERL=0: Session Recovery

ERL=0 (Session Recovery) is triggered when failures within a command,

within a connection, and/or within TCP occur. This causes all of the previous

connections from the failed session to be restarted on a new session by

sending a iSCSI Login Request with a zero TSIHRestart all iSCSI connections

on any failure.

ERL=1: Digest Failure Recovery

ERL=1, only applies to traditional iSCSI. For iSCSI/SCTP (which has its own

CRC32C) and both types of iSER (so far), handling header and data checksum

recovery can be disabled.

ERL=2: Connection Recovery

ERL=2, allows for both single and multiple communication path sessions

within a iSCSI Nexus (and hence the SCSI Nexus) to actively perform

realligence/retry on iSCSI ITTs from failed iSCSI connections. ERL=2 allows

iSCSI fabrics to take advantage of recovery in all regards of transport level

fabric failures, and in a completely OS independent fashion (i.e. below the host

OS storage stack).

High-Availability (N8900, N12000 series/N16000 series only)

HA keeps your data active on two separate systems, Thecus Supports

Active/Passive HA — provides a fully redundant instance of each node, which is only

brought online when its associated primary node fails.

HA setup procedure:

HA needs two identical Thecus systems (same models and same hard disk slot

installed) which are capable for high availability features. One needs to be setup as

“Primary” and the second unit as “Secondary”, both units’ needs to have the RAID

volume build up prior installation.

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