[sled-agent] Destroy orphaned datasets (PR 3/2) #8323
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June 12, 2025 13:33
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andrewjstone
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Jun 12, 2025
| /// control "chicken switches" (potentially-destructive sled-agent behavior | ||
| /// that can be toggled on or off via `omdb`) | ||
| #[clap(subcommand)] | ||
| ChickenSwitch(ChickenSwitchCommands), |
| List, | ||
| enum ChickenSwitchCommands { | ||
| /// interact with the "destroy orphaned datasets" chicken switch | ||
| DestroyOrphans(DestroyOrphansArgs), |
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I can't get over the name of this variant.
| @@ -65,6 +66,7 @@ pub(crate) fn spawn<T: SledAgentFacilities>( | |||
| currently_managed_zpools_tx: watch::Sender<Arc<CurrentlyManagedZpools>>, | |||
| external_disks_tx: watch::Sender<HashSet<Disk>>, | |||
| raw_disks_rx: RawDisksReceiver, | |||
| destroy_orphans: Arc<AtomicBool>, | |||
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I've said it before. All you need is an AtomicBool!
| .datasets_report_orphans( | ||
| datasets.clone(), | ||
| currently_managed_zpools, | ||
| self.destroy_orphans.load(Ordering::Relaxed), |
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Yay, proper usage of ordering!
|
Tested enabling this on One case that would have failed without this is this internal DNS dataset, which we expunged and replaced on the same zpool: Looking at the zpool history, we see when RSS created the initial dataset, and when sled-agent destroyed it and replaced it with the new one: |
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Builds on #8302. This allows the config-reconciler to destroy durable datasets it believes are orphaned due to expunged Omicron zones. This is disabled by default, and can be enabled on a sled-by-sled case via a new
omdb sled-agent chicken-switch destroy-orphans enablesubcommand (with related commands togetanddisablethe same).We don't want to ship automatic dataset deletion before R17 (R16 should only ship "report orphaned datasets"), but we need to be able to turn it on for upgrade testing in the meantime. All of this
chicken-switchstuff should be removeable after R16, once we're comfortable enabling deletion in general.