Technical data

Acer | HDS AMS200 User and Reference Guide 275
Appendix A Glossary
Cache backup Because a cache memory uses DRAM, information stored in it is lost
when the subsystem power is shut off. To provide against
unexpected power failure, the subsystem has an setup to maintain
data in the cache memory by batteries.
Cache backup is a state in which the data is protected by the
batteries.
CHAP
(Challenge
Handshake
Authentication
Protocol)
One of authentication methods. Security is high because
authenticated information exchanged on network is encrypted by
hash value.
CIFS Common Internet File System
CIFS is the extension of SMB protocol used in the file sharing service
of the WIndows.
The specification is disclosed so that the CIFS can be used in the OS
other than Windows.
CSMA/CD
(Carrier Sense
Multiple Access
with Collision
Detection)
CSMA/CD is the LAN access method used in Ethernet. When a device
wants to transmit data, it monitors the transmission status of a
cable. If the cable is free, the device transmits data. If the cable is
not free, the device waits a random amount of time before retrying.
If more than two devices start a transmission at exactly the same
time, a collision occurs in a cable. They both back off and wait a
random amount of time before retrying. The CSMA/CD enables
multiple devices to communicate sharing one cable.
CTL Controller
CUDG Control Unit Diagnosis
Data LAN interface LAN interface in NAS unit that takes access from the NFS/CIFS client.
User LAN interface provides Copper 4 ports for one NAS unit, and
supports 1Gbit/s.
Destage Automatically writes data in cache memory, not yet written on the
disk drive, on the disk drive when the main switch is turned off.
DHCP DHCP is an abbreviation for Dynamic Host Configuration Protocol; it
is a client/server type protocol according to which a server
automatically assigns an IP address when each client has started.
ECC Error Checking and Correcting
EIA Electronic Industries Alliance
EIA standard (1 EIA unit = 44.45 mm)