IBM E16RMLL-I Implementation Guide - Page 68
Communication protocol
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When planning for LAN-free data movement, remember that the file metadata must still be sent over the LAN. This metadata can add overhead to a LAN-free backup. Even though the data is streaming over the SAN to the tape or disk, the metadata still goes to the Tivoli Storage Manager server using whatever LAN protocol and speed are being used. As you might imagine, as the amount of metadata grows, the LAN-free backup speed will approach the speed of LAN-based backup. Experience has shown that systems with large files (greater than 10 MB, on average) and large amounts of data (greater than 50 GB) are good candidates for LAN-free backup, while systems with numerous small files (average size in KB) often perform better using traditional LAN-based backups. Examples of the former include databases, mail systems, and ERP systems; examples of the latter are traditional file and print type servers. LAN/WAN (TCP/IP) Client Backup Server SAN FC Device Data Figure 2-2 LAN-free data movement Tape Data Flow Control Flow 2.7.2 Communication protocol Most network protocols such as TCP/IP and NETBIOS are supported by Tivoli Storage Manager. TCP/IP is the most common communication method and the easiest to set up. Certain functions, such as server prompted mode and the Web clients, require TCP/IP. 38 IBM Tivoli Storage Manager Implementation Guide
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