Archive old data

By default, COU plans for and runs an archive step before proceeding to actual upgrade steps. This can be turned off with the --no-archive flag.

This archive step is a performance optimisation, moving data for soft deleted nova instances into a shadow table.

The archiving is run in batches. The default batch size is 1000. On some clouds, it may be desirable to reduce the batch size to reduce database load. The batch size can be configured with archive-batch-size <size> where size is a positive integer.

Usage examples

With a custom batch size:

~$ cou plan --archive-batch-size 200
Full execution log: '/home/ubuntu/.local/share/cou/log/cou-20231215211717.log'Connected to 'test-model' ✔Analyzing cloud... ✔Generating upgrade plan... ✔Upgrade cloud from 'ussuri' to 'victoria'    Verify that all OpenStack applications are in idle state    Back up MySQL databases    Archive old database data on nova-cloud-controller    Control Plane principal(s) upgrade plan    ...

Disabling the archive step:

~$ cou plan --no-archive
Full execution log: '/home/ubuntu/.local/share/cou/log/cou-20231215211717.log'Connected to 'test-model' ✔Analyzing cloud... ✔Generating upgrade plan... ✔Upgrade cloud from 'ussuri' to 'victoria'    Verify that all OpenStack applications are in idle state    Back up MySQL databases    Control Plane principal(s) upgrade plan    ...

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