Re: [List] Cannot find out what uses space in ZFS dataset
- Reply: freebsd_a_vanderzwan.org: "Re: [List] Cannot find out what uses space in ZFS dataset"
- Reply: David Christensen : "Re: [List] Cannot find out what uses space in ZFS dataset"
- In reply to: Frank Leonhardt : "Re: [List] Cannot find out what uses space in ZFS dataset"
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Date: Thu, 18 Sep 2025 15:57:53 UTC
On 9/18/25 17:28, Frank Leonhardt wrote: Thanks a lot for answering. > First - and I can't say this often enough - ignore du with zfs! It > produces a figure for backward compatibility purposes but it's not good > at dealing with zfs concepts like compression. Well... I agree with you if the goal is finding out disk occupation. However what I'm trying to do is "zfs send" this dataset: AFAICT this ignores compression/deduplication/data sharing/etc... so it should more or less agree with du. > The REFERenced column is the amount of data accessible in the dataset > and may be shared with other datasets. OK. > The Used column is the amount of > space consumed by the dataset AND ALL IT'S DESCENDENTS and snapshots and > suchlike. "zfs send" does not include descendents or snapshots, so it's fine. > Things like cloned datasets and block deduplication confuse matters even > further. I don't use these. > zfs list -t all -o > name,refer,used,usedbychildren,usedbydataset,usedbyrefreservation,usedbysnapshots I don't think I'm interested in snapshots, but in any case: > # zfs list -t all -o name,refer,used,usedbychildren,usedbydataset,usedbyrefreservation,usedbysnapshots|grep default > zroot/ROOT/default 62.1G 70.9G 0B 62.1G 0B 8.76G > zroot/ROOT/default@auto_zroot-20241014020000 3.11G 2.95G - - - - > zroot/ROOT/default@auto_zroot-20241113010000 3.01G 198M - - - - > zroot/ROOT/default@auto_zroot-20241213010000 3.30G 70.7M - - - - > zroot/ROOT/default@auto_zroot-20250112010000 3.30G 60.4M - - - - > zroot/ROOT/default@auto_zroot-20250211010000 3.30G 64.9M - - - - > zroot/ROOT/default@auto_zroot-20250313010000 3.31G 263M - - - - > zroot/ROOT/default@auto_zroot-20250412020000 3.32G 149M - - - - > zroot/ROOT/default@auto_zroot-20250512020000 3.32G 68.6M - - - - > zroot/ROOT/default@auto_zroot-20250611020000 3.34G 209M - - - - > zroot/ROOT/default@auto_zroot-20250711020000 62.2G 407M - - - - > zroot/ROOT/default@auto_zroot-20250810020000 62.1G 107M - - - - > zroot/ROOT/default@auto_zroot-20250821020000 62.1G 36.2M - - - - > zroot/ROOT/default@auto_zroot-20250828020000 62.1G 33.9M - - - - > zroot/ROOT/default@auto_zroot-20250904020000 62.1G 28.1M - - - - > zroot/ROOT/default@auto_zroot-20250909020000 62.1G 10.1M - - - - > zroot/ROOT/default@auto_zroot-20250911020000 62.1G 10.3M - - - - > zroot/ROOT/default@auto_zroot-20250912020000 62.1G 1.84M - - - - > zroot/ROOT/default@auto_zroot-20250913020000 62.1G 5.97M - - - - > zroot/ROOT/default@auto_zroot-20250914020000 62.1G 5.79M - - - - > zroot/ROOT/default@auto_zroot-20250915020000 62.1G 4.75M - - - - > zroot/ROOT/default@auto_zroot-20250916020000 62.1G 2.48M - - - - > zroot/ROOT/default@auto_zroot-20250917020000 62.1G 2.08M - - - - > zroot/ROOT/default@auto_zroot-20250917180000 62.1G 1.27M - - - - > zroot/ROOT/default@auto_zroot-20250917190000 62.1G 1.44M - - - - > zroot/ROOT/default@auto_zroot-20250917200000 62.1G 1.21M - - - - > zroot/ROOT/default@auto_zroot-20250917210000 62.1G 1.18M - - - - > zroot/ROOT/default@auto_zroot-20250917220000 62.1G 1.54M - - - - > zroot/ROOT/default@auto_zroot-20250917230000 62.1G 1.36M - - - - > zroot/ROOT/default@auto_zroot-20250918000000 62.1G 1.44M - - - - > zroot/ROOT/default@auto_zroot-20250918010000 62.1G 1.42M - - - - > zroot/ROOT/default@auto_zroot-20250918020000 62.1G 1.65M - - - - > zroot/ROOT/default@auto_zroot-20250918030000 62.1G 1.95M - - - - > zroot/ROOT/default@auto_zroot-20250918040000 62.1G 964K - - - - > zroot/ROOT/default@auto_zroot-20250918050000 62.1G 1.61M - - - - > zroot/ROOT/default@auto_zroot-20250918060000 62.1G 960K - - - - > zroot/ROOT/default@auto_zroot-20250918070000 62.1G 1.48M - - - - > zroot/ROOT/default@auto_zroot-20250918080000 62.1G 1.47M - - - - > zroot/ROOT/default@auto_zroot-20250918090000 62.1G 1.74M - - - - > zroot/ROOT/default@auto_zroot-20250918100000 62.1G 2.07M - - - - > zroot/ROOT/default@auto_zroot-20250918110000 62.1G 2.03M - - - - > zroot/ROOT/default@auto_zroot-20250918120000 62.1G 892K - - - - > zroot/ROOT/default@auto_zroot-20250918130000 62.1G 1.19M - - - - > zroot/ROOT/default@auto_zroot-20250918140000 62.1G 1.62M - - - - > zroot/ROOT/default@auto_zroot-20250918150000 62.1G 1.81M - - - - > zroot/ROOT/default@auto_zroot-20250918160000 62.1G 1.58M - - - - > zroot/ROOT/default@auto_zroot-20250918170000 62.1G 1.86M - - - - But again, how does this help me? How do I find out which files take up those 62.1GB if "du" does not account for them? bye av.