shuppy (@delan) — [archived]
shuppy (@delan) — [archived]

waow this one small trick will make your zpool scrub faster!!

in openzfs dsl_scan.c, changing `scn->scn_phys.scn_min_txg` from 0 to 7000000 in dsl_scan_setup_sync zpool status after scrubbing with stock zfs 2.2.4, taking over seven minutes zpool status after scrubbing with patched zfs 2.2.4, taking just over two minutes and issuing reads for only 316GiB of the 970GiB pool

(not really. i’m just patching zfs to reproduce a bug that happens near the end of a scrub)

shuppy (@delan) — [archived]

we’ve done it. blazingly fast, zero-cost scrubbing

zpool status reporting “scan: scrub repaired 0B in 00:00:00 with 0 errors on Fri May 17 00:56:15 2024”