Nasuni Edge Appliance Initial Configuration Guide 8.3 109
C
cache
A cache is a computer component that stores data locally so that future requests for that data can be
served faster. While all data and metadata are stored in cloud storage, data that requires regular access
is kept locally. This includes files that are re-written and data that is read often. If the requested data
does not reside locally, it is staged into the cache and provided for the request.
cache miss
If requested data does not reside in the local cache, and must be staged into the cache for the request,
this is called a “cache miss”.
Challenge-Handshake Authentication Protocol (CHAP)
A protocol that authenticates a user or network host to an authenticating entity.
CHAP (Challenge-Handshake Authentication Protocol)
See “Challenge-Handshake Authentication Protocol (CHAP)” on page 109.
chunks
Before sending data to the cloud, Nasuni breaks files into optimally-sized pieces for transport between
the on-premises cache and cloud storage. This not only disguises the actual sizes of files, but also
improves performance. These chunks are then deduplicated, compressed, and encrypted.
CIFS (Common Internet File Service)
A standard protocol that allows Windows users to share files across a network.
ClamAV (Clam antivirus)
See “Antivirus (AV)” on page 108.
copy-on-write (COW) disk
The copy-on-write (COW) disk is used during the snapshot process. If any writes to the Nasuni Edge
Appliance occur during a snapshot, the previous data from the cache disk is copied to the COW disk,
and the new data is written to the cache disk. Hence, the term “copy-on-write”. This allows new writes
to take place at any time, even during the snapshot process.
COW (copy-on-write) disk
See “copy-on-write (COW) disk” on page 109.
D
DAS (Direct Attached Storage)
See “Direct Attached Storage (DAS)” on page 110.
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