Overland Storage SnapSAN S1000 User Manual page 118

SnapSAN S1000 User Guide
CHAP
Short for Challenge Handshake Authentication Protocol. A scheme used to verify the identity
of remote clients in a network.
If there are security concerns, it is possible to set up authentication of targets and initiators,
using the CHAP authentication protocol. With CHAP authentication, an initiator can only
connect to a target if it knows the target's password or secret. To set up CHAP, the same
secret must be known by both the initiator and target.
It is also possible to use Mutual CHAP, where there is a second authentication phase. After
the target has authenticated the initiator, the initiator will authenticate the target using an
initiator secret. Put simply, with CHAP the target can ensure that the initiator connecting is
who it claims to be; with mutual CHAP, the initiator can also ensure that the target is who
it claims to be.
Chunk Size
This is the amount of data that is written on a single drive before the controller moves to the
next drive in the stripe.
DHCP
Short for Dynamic Host Configuration Protocol. A mechanism for assigning unique IP
addresses to network nodes.
Discovery
Discovery is the process by which an initiator 'discovers' a target. Discovery uses a special
type of session, called a Discovery Session, where an initiator connects to a RAID storage
controller and asks it to send a list of the targets present on the controller. The target will
respond with a list of all the targets to which the initiator has access.
Disk Roaming
This is the process of removing a disk drive from a controller and putting it back later, either
on the same controller, or a different one, and having it recognized as the same disk drive.
The disks may be can be attached to different ports than they were originally attached to,
without harm to the data. The disks may be attached to the same ports or different ports on
the controller.
DNS
Short for Domain Name Service. A network service that translates domain names into IP
addresses.
DSM
Short for Device Specific Module, it is a software module that allows RAID storage array
hardware to use Microsoft's MPIO.
Expansion Slot
Area in a computer that accepts additional input/output boards to increase the capability of
the computer.
F_port
A Fabric port within a Fibre Channel switch that provides a point-to-point link attachment
to a single N_Port. F_Ports are intermediate ports in virtual point-to-point links between
end ports, for example N_Port to F_Port to F_Port to N_Port using a single Fibre Channel
fabric switch.
10400310-003 01/2013
©2010-13 Overland Storage, Inc.
Glossary
GL-3
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