Thecus N2810 Series User Manual page 103

Unused
Allocation
LUN ID
iSCSI Block size
Advance Option
There are available options for the user to operate Thecus IP storage associated
with iSCSI setting. The details are listed in the following screenshot. If the
options are modified, the system will need to reboot for the changes to take place.
Max Connections
The maximum number of iSCSI connections.
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 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).
Unused space on current RAID volume.
Percentage and amount of space allocated to iSCSI
volume.
Specific Logic unit ID number.
The iSCSI block size can be set under system advance
option, default is 512 Bytes.
[ 4K ] block size while more than 2TB capacity will be
configured in Windows XP.
[ 512 Bytes ] block size for application like VMware etc.
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