HP Data Protector Operations Guide
Order of Disk Agents started
Data Protector has 2 backup modes: SAN Backup mode, and LAN Backup mode.
1. If you do a SAN backup, Data Protector always tries to run local backups. It will fill up all
slots of a running local Media Agents with available Disk Agent slots.
Example:
• Server A – FS1, FS2, FS3 Local (SAN attached) Device D1 with concurrency 4
• Server B – FS4, FS5, FS6 Local (SAN attached) Device D2 with concurrency 4
So Device D1 with concurrency 4 backs up FS1 to FS4, which means for FS4, Data Protector
runs a Network (LAN) backup. Then Data Protector starts D2 to backup FS5 and FS6 for a
SAN backup.
2. In case of a LAN backup, Data Protector always tries to reduce the load of a Server. So it
starts only 1 Disk Agent per server, and picks up the next one until all slots are all filled up.
Example:
Server A – FS1, FS2, FS3
Server B – FS4, FS5, FS6
Server C – Media Agent host with D1 and D2 concurrency 2
D1 will start and backup FS1 and FS4. Then D2 will start (together with D1) and backup FS2
and FS4. The first free slot will backup FS3 and FS6.
Defining drive-based concurrency
Go to the drive Advanced Options, Settings, and specify the number of Disk Agents to be
used by default for the drive. The Data Protector default value is 4.
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