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最好不使用多个备份软件或同一软件多个实例进行vSphere VADP CBT全量和增量备份；
只使用一个备份软件实例进行备份，避免冲突；
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2017-10-2 上午3:38
Hi, would like to check is it possible to have 2 backup products backing up via vSphere VADP using CBT?
A scenario will be backup product A performing full & incremental backup of VMs using VADP, and another product performing VM incremental replication.
Thanks.
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2017-10-5 下午1:45 （）
There will be no issues, CBT is designed to handle such usage scenarios as CBT sets a flag number (epoch) each time it backs up.
The first backup starts on a VM and sets an epoch of 1. Next backup starts and looks for changes beyond epoch 1, if there are it sets a new epoch of 2. This continues increment as the backups continue.
When adding another backup product it will query the epoch and compare it to the last one is used, say 1, and now the epoch is up to three. It will backup the data from epoch 2 and 3 to get caught up.
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2017-10-9 下午7:12 （）
Thanks. Will you be able to point me to any documentation on this? I would like to understand more.
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2017-11-2 下午12:05 （）
Hi Keith,
I would recommend VMware's VDDK guide:
Take a look at the "Backup and Recovery Example" chapter at page 40, which describes the backup process in general. Basically every backup application follows this scenario. In short, it goes like this:
1 Perform full backup
1.1 Create a snapshot and remember the cbtChangeId attribute for each virtual disk
1.2 Backup all data on virtual disks
1.3 Remove the snapshot
2. Perform incremental backup
2.1 Create a snapshot and obtain a list of changed blocks since the snapshot taken in 1.1 using the cbtChangeId from 1.1
2.2 Backup only changed blocks
2.3 Remove the snapshot
Each of your backup applications creates its own snapshots and therefore uses different cbtChangeIds. The CBT technology can deal with this.
However, I would advise against running multiple backups simultaneously as there are connection and other limits in vSphere which you might hit.
Cheers, Pavel
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2017-11-21 上午11:41 （）
VADP integrated backup products utilize snapshot to take backups. Each backup operation either it can be full-backup or incremental-backup is independent and will create its own snapshot to do backup. It doesn't matter if its the same backup product or two different backup products will be utilized in here.
If CBT is enabled in this case, for every snapshot if any data change exists then CBT can be utilized to pick only the changed blocks & do incremental backups.
For more information about CBT, use of Change-Id please refer to "Changed Block Tracking on Virtual Disks" in
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