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Couchbase Server Manual 2.0
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2 Installing and Upgrading
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2.5. Upgrading to Couchbase Server 2.0.x

2.5.1. Online Upgrades
2.5.2. Online Upgrade with Swap Rebalance
2.5.3. Offline Upgrade Process

The following are officially supported upgrade paths for Couchbase Server for both online upgrades or offline upgrades:

Important

If you want to upgrade from 1.8.0 to 2.0.x, you must have enough disk space available for both your original Couchbase Server 1.8 data files and the new format for Couchbase Server 2.0 files. You will also need additional disk space for new functions such as indexing and compaction. You will need approximately three times the disk space.

Direct upgrades from Couchbase Server 1.8.0 to 2.0 or earlier releases are not supported. You must first upgrade to Couchbase Server 1.8.1 to provide data compatibility with Couchbase Server 2.0 +.

You can perform a cluster upgrade in two ways:

FeatureOnline UpgradesOffline Upgrades
Applications Remain AvailableYesNo
Cluster Stays in OperationYesNo
Cluster must be ShutdownNoYes
Time RequiredRequires Rebalance, Upgrade, Rebalance per NodeAll nodes in Cluster Upgraded at Once

Best Practice: Backup your data before performing an upgrade

Before you perform an upgrade, whether it is online or offline, you should backup your data, see Section 5.6, “Backup and Restore”.