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lvm-pvc-snapshot: cut retention 7->3 days (reduce sdc thin-pool CoW IOPS + free ~1TB)
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Part of the sdc IOPS-reduction work (code-oflt). 462 daily thin snapshots
(66 PVCs x 7d) drive ~10-34 w/s of thin-pool metadata (tmeta) CoW writes on
the contended sdc spindle and pin ~2TB in the 70%-full pool. Halving to 3
days roughly halves both. Instant-restore window shrinks 7->3d; daily-backup
still keeps 4 weeks of file-level PVC history, so DR coverage is unchanged.

Deployed to the PVE host via scp (these host scripts are scp-deployed, not
TF-managed). Doc updated in .claude/CLAUDE.md.

Refs: code-oflt.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Viktor Barzin 2026-06-29 12:59:03 +00:00
parent 256122ff5b
commit 4473b469e3
2 changed files with 2 additions and 2 deletions
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2
scripts/lvm-pvc-snapshot.sh
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@ -7,7 +7,7 @@ set -euo pipefail
VG="pve"
THINPOOL="data"
SNAP_SUFFIX_FORMAT="%Y%m%d_%H%M"
RETENTION_DAYS=7
RETENTION_DAYS=3 # 7->3 (2026-06-29, code-oflt): fewer thin snapshots = less tmeta CoW write-IOPS on sdc + ~1TB freed; daily-backup keeps 4wk file-level history
MIN_FREE_PCT=10
PUSHGATEWAY="${LVM_SNAP_PUSHGATEWAY:-http://10.0.20.100:30091}"
PUSHGATEWAY_JOB="lvm-pvc-snapshot"