Informatica Infrastructure Unix and Network Terminologies.

Server : Server is a machine or system with huge capacity having many cpus and large amount of memory and can handle many client requests.

Datacenter: It is a physical location where all the servers are placed. All the servers may be placed in the same data center or may be placed in different data centers across the globe.

Telnet / Putty : It is a client  tool used to connect to the servers.

Mounts: - Mount is a partition on the Operating System It's an installation part for each of the applications. Each mount on server may hold one applications (Oracle ,Informatica, Cognos etc).

NAS Mounts : Network Attached Storage.

SAN Mounts : Storage Attached Network.

TNS  Entry : It's an interface between the Any applications and Oracle Need tns entry  in order to connect to it. TNS entry needs to be added in tnsnames.ora file 
Lightweight Directory Access
LDAP is an Internet standard protocol used by applications to access information in a directory.
It runs directly over TCP, and can be used to access a standalone LDAP directory service or to access a directory service.

LDAP is a protocol defining a directory service and access to that service. LDAP is based on a client-server model. LDAP servers provide the directory service, and LDAP clients use the directory service to access entries and attributes.
A SAN file system is programming that enables the sharing of the same copies of files stored on common storage media among multiple servers that may have different operating systems.
Network Attached Storage
A NAS unit is a computer connected to a network that provides only file-based data storage services to other devices on the network. Although it may technically be possible to run other software on a NAS unit, it is not designed to be a general purpose server. NAS systems contain one or more hard disks, often arranged into logical, redundant storage containers or RAID arrays.
Attached Storage
DAS refers to a digital storage system directly attached to a server or workstation, without a storage network in between, mainly used to differentiate non-networked storage from SAN and NAS.

A DAS device can be shared between multiple computers, as long as it provides multiple interfaces (ports) that allow concurrent and direct access.
The difference between a NAS and a SAN is that NAS appears to the client OS (operating system) as a file server (the client can map network drives to shares on that server) whereas a disk available through a SAN still appears to the client OS as a disk.

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