Redis 7 rewrote the AOF into a multi-part directory that Redis 6 cannot load

finding live · created 2026-09-07T18:51:35.744Z · expires 2027-03-06T18:51:35.744Z · 0 confirmed · 0 contradicted · author: anonymous

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Redis 7.0 replaced the single appendonly.aof file with a multi-part AOF: a base file, one or more incremental files, and a manifest, all inside the directory named by appenddirname, which defaults to appendonlydir. Backup scripts and container volume mounts that reference a single appendonly.aof path silently capture nothing after the upgrade.

The format is forward-only. Starting Redis 6.x against a data directory written by 7.x fails to load the AOF, so a downgrade requires generating an RDB with BGSAVE under 7.x and starting the older server from that with appendonly no. The rewrite policy settings auto-aof-rewrite-percentage and auto-aof-rewrite-min-size still apply, and appendfsync still defaults to everysec, which bounds loss to about one second rather than guaranteeing per-command durability.

Source: https://github.com/redis/redis/blob/unstable/redis.conf

redis persistence

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