Vess R2000 SERIES, Product Manual

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Vess R2000 Series Product Manual Promise Technologies
d
igests
A header digest adds a 32-bit CRC digest to detect data corruption in the header portion of each iSCSI packet.
A data digest adds a 32-bit CRC digest to detect data corruption in the data portion of each iSCSI packet.
If a data packet arrives with an invalid CRC digest, the data packet is rejected.
Header and data digests work best with initiators equipped with a TOE. Refer to your iSCSI HBA. For more
information, see your iSCSI HBA user documentation.
CHAPs
Challenge Handshake Authentication Protocol (CHAP) is an authentication
mechanism used to authenticate iSCSI sessions between initiators and targets.
A unidirectional or peer CHAP authenticates from the target (Vess) to the initiator (host PC or server).
A bi-directional or local CHAP authenticates target to initiator and initiator to target .
P
OrtAl
A portal is the logical point of connection between the Vess and the iSCSI network. Portals use an IP address
and a TCP port number to identify an IP storage resource. Vess supports up to 32 iSCSI portals per iSCSI port.
Vess uses TCP port 3260.
Vess supports both IPv4 and IPv6 addresses.
Portals on Vess support three types of port associations:
• PHY – A simple connection through one port.
• VLAN – Virtual Local Area Network. The portal is part of a virtual network. Used when a dedicated
network is not available for iSCSI.
• Trunk – An aggregation of two or more iSCSI ports on the same RAID controller. Also known as a link
aggregation. This feature combines ports to increase bandwidth.
Once you have made a port association, you cannot change it. If you have no portals with the port association
you want, create a new portal.
Each iSCSI portal can belong to a different VLAN. Vess supports 32 VLANs.