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The quarterly backup script travels on the pool; its S3 sync needs
awscli + /root/.aws/credentials symlink to /opt/snonux/secrets/aws.credentials
on the hosting f-host. Snapshot export still works without it; only the
offsite S3 sync is skipped.
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4-disk raidz2 USB-SATA pool used as offline backup storage, loaded ~once
per quarter. Migrated from t450 to the f3s USB-key scheme: zusb/data/enc
rekeyed from passphrase to a raw key on the F3S_KEYS sticks at
/keys/zusb.key. Scripts + key deployed to all f-hosts (f0/f1/f2/f3) so
the disk stack can be re-plugged to any host. Not auto-mounted.
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Add shellyfans rc.d service (boot-time auto-on for the rack fans on the
Shelly Plug M Gen 3 at 192.168.1.28) and a standalone shelly-plug.sh
helper to query/control the plug over its HTTP RPC API.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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After a CARP failover where f1 serves as MASTER, any NFS writes go to
the sink dataset (zdata/sink/f0/zdata/enc/nfsdata). When f1 returns to
BACKUP, zfs receive from f0 fails with "destination has been modified
since most recent snapshot" because the filesystem state is ahead of the
last received snapshot.
Fix: on BACKUP transition, roll the sink back to the last zrepl snapshot
before setting readonly=on. Writes during the MASTER window (health
checks, test writes) are intentionally discarded — f0 is authoritative
and replication resumes cleanly from the common snapshot.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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When f1 (BACKUP) becomes MASTER, its zrepl sink dataset
(zdata/sink/f0/zdata/enc/nfsdata) was kept readonly=on. NFS clients
could mount and read but all writes failed with EROFS. carpcontrol.sh
now sets readonly=off before starting NFS services on MASTER takeover,
and restores readonly=on before stopping them on BACKUP transition so
zrepl can resume receiving snapshots from f0.
Without this, every controlled CARP failover to f1 left NFS read-only
until manually fixed with `zfs set readonly=off`.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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