How many backup systems are there?

Common data backup systems mainly include host-based, LAN-based and SAN-based systems without LAN and server.

Host-based backup method:

Host-based is a traditional data backup structure, and the tape library is directly connected to the server and only provides data backup services for the server. In most cases, this kind of backup mostly uses the tape drive that comes with the server, and the backup operation is often carried out by manual operation.

The advantages of host-based backup structure are fast data transmission and simple backup management. The disadvantage is that it is not conducive to the enjoyment of the backup system and is not suitable for the current large-scale data backup needs.

Backup mode based on LAN:

LAN-based backup, in which data transmission is based on the network. A server is configured as a backup server, which is responsible for the backup operation of the whole system. The tape library is connected to the server, and the backup object transmits data to the tape library through the network to realize backup.

The advantages of backup structure based on LAN are investment saving, tape library sharing and centralized backup management. Its disadvantage is that the network transmission pressure is high.

LAN-free backup mode:

The backup system without LAN and server is based on SAN (Storage Area Network), and its structure is shown in the following figure. SAN-based backup is a solution to completely solve the problem that traditional backup methods need to occupy LAN bandwidth. It adopts a brand-new architecture and regards the tape library and disk array as independent optical fiber nodes. When multiple hosts * * * enjoy tape library backup, the data stream is directly transmitted from the disk array to the tape library without going through the network, which is a solution that does not occupy network bandwidth (no LAN).

At present, with the continuous progress of SAN technology, the structure without LAN is quite mature, while the backup structure without server is not very mature.

The advantages of no LAN are unified management of data backup, fast backup speed, low network transmission pressure and shared tape library resources. The disadvantage is high investment.

With the help of IBM Tivoly Storage Manager software and IBM LTO and other tape library products, the above backup methods can be realized.

Selection of data backup mode

At present, there are three main data backup methods: LAN backup, LAN-free backup and SAN serverless backup. LAN backup can be used for all storage types, while LAN-free backup and SAN-free server backup can only be used for SAN architecture storage.