Synchronous Replication; Target Discovery; Tcp; Tcp/Ip - American Megatrends StorTrends 1300 User Manual

Synchronous Replication

Synchronous Replication allows data to be stored on a pair (or more) of storage
appliances, with one being designated the primary, typically the application server which
is receiving the original I/Os, and secondary appliances to be used as duplicates of the
primary. In short, when an I/O is recorded, it is written simultaneously to both the
primary and the secondary to ensure parity. The writing of the I/O to the primary is in
essence blocked until the secondary is updated. In this way, volumes are protected from
failure at the granularity of an I/O, since the primary and secondary sites are always
perfectly synchronized with each other, as the name suggests.

Target Discovery

For an iSCSI initiator to discover iSCSI targets, it needs to identify which devices in the
network are storage resources and what IP addresses it needs to access them. A query to
an iSNS server consequently returns a list of IP addresses that the initiator has permission
to access.

TCP

Transmission Control Protocol. One of the main protocols in TCP/IP networks. Enables
two hosts to establish a connection and exchange streams of data.

TCP/IP

Transmission Control Protocol/Internet Protocol, the suite of communications protocols
used to connect hosts on the Internet. TCP/IP uses several protocols, the two main ones
being TCP and IP.

Upgrade

To upgrade means that you are replacing an old version of a software product with a
newer version of the same product.

User DN

User Distinguished Name. For example, marketing users on the ami.com domain would
be entered as follows:
CN=ADMINNAME,CN=USERS,DC=AMI,DC=COM

VSS

Microsoft® Volume Shadow Copy Service. VSS is the infrastructure that enables built-in
high-fidelity snapshot (shadow-copy) capability. VSS is designed to support both host-
based and hardware based storage solutions. Host based solutions, as the name suggests,
are host-resident and either need special software providers or can use the default system
software provider of VSS.
336 StorTrends® 1300 User's Guide (StorTrends iTX version 2.7)