User`s manual

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Chapter 3: System Administration
Error Recovery Level
The Error Recovery Level (ERL) is negotiated during a leading iSCSI connection login in traditional
iSCSI (RFC 3720) and iSER (RFC 5046).
ERL=0: Session Recovery
ERL=0 (Session Recovery) is triggered when failures within a command, within a connec-
tion, 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).
File Sharing/Privilege3.5
The Thecus IP storage has built-in user database that allows administrators to manage user access
using different group policies. From the File Sharing/Privilege menu, you can create, modify, and de-File Sharing/Privilege menu, you can create, modify, and de- menu, you can create, modify, and de-
lete users, and assign them to groups that you designate.
ADS Support (N4520/N4560 Only)3.5.1
If you have a Windows Active Directory Server (ADS) to handle the domain security in your network,
you can simply enable the ADS support feature; the Thecus IP storage will connect with the ADS
server and get all the information of the domain users and groups automatically. From the Accounts
menu, choose Authentication item and the ADS Support screen appears. You can change any of
these items and press Apply to confirm your settings.
A description of each item follows:
ADS/NT Support