Example 1b – Migrate a ZFS File System (Incremental) - Lift and Shift Guide – Migrating Application Data From Older SPARC Systems to Newer SPARC Systems

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Example 1b – Migrate a ZFS File System (Incremental)

This example migrates an incremental ZFS dataset from the source system to shared storage, then to an already prepared ZFS file system on the target system.

This procedure is used in situations when there is a lapse between the time that the initial full ZFS data is captured on the source and then fully restored on the target. If the source system remained in production during the initial migration, you can perform an incremental zfs send to migrate only the changed data.

Ensure that shared storage is prepared.
See Prepare Shared Storage.

From the source global zone, create a ZFS snapshot of the source system.

root@Source# zfs snapshot -r zone01@snap02

root@Source# zfs list -t snapshot
NAME          USED    AVAIL    REFER    MOUNTPOINT
zone01@snap01 0       -        35K      -

Use specific zfs send options to only transfer changes that occurred after the full snapshot.
The zfs send command offers these options for generating incremental streams:
- -R – Replicates the file system up to the named snapshot.
- -I – Generates a stream package that sends all intermediary snapshots from the first snapshot to the second snapshot.
This example sends the incremental snapshot to shared storage.

Note – For the appropriate path to the pigz command, see the Secondary Commands table in Data Migration Commands.
```
root@Source# zfs send -R -I zone01@snap01 zone01@snap02 | pigz > /SharedStorage/zone02.gz
```
From the target guest domain, transfer the compressed snapshot from the shared storage to the target zpool.
Note – For the appropriate path to the pigz command, see the Secondary Commands table in Data Migration Commands.
```
root@Target#  pigz -dc -f /SharedStorage/zfs_send/test_snapI2.gz | zfs receive zone01
```