Date: Thu, 18 Sep 2025 19:39:44 +0200 From: Andrea Venturoli <ml@netfence.it> To: freebsd@vanderzwan.org Cc: questions@freebsd.org Subject: Re: [List] Cannot find out what uses space in ZFS dataset Message-ID: <804e8cad-e197-4ce0-b8cf-7ee326a53a94@netfence.it> In-Reply-To: <09543B55-0259-4CCD-B56B-49FAACFB9663@vanderzwan.org> References: <8edc1a9d-bad8-4d35-8e90-b750eec84e0a@netfence.it> <b056fd28-4b48-453f-9da3-299a842ffc32@fjl.co.uk> <16810449-2952-4257-b8d4-d74e03a18ff4@netfence.it> <09543B55-0259-4CCD-B56B-49FAACFB9663@vanderzwan.org>
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On 9/18/25 18:44, freebsd@vanderzwan.org wrote: >>> zroot/ROOT/default@auto_zroot-20250611020000 3.34G 209M - - - - >>> zroot/ROOT/default@auto_zroot-20250711020000 62.2G 407M - - - - > > Here the refer jumps from 3.34 to 62.2 GB, so it looks like your missing data is in this snapshot. Hmmm... > # zfs list -o name,refer,used,usedbysnapshots|grep default > zroot/ROOT/default 62.1G 70.5G 8.36G usedbysnapshots is 8.36G, so I guess this single snapshot cannot take 60GB. Also "zfs send" doesn't transmit snapshots, so, even if this was true, it should not produce such a big amount of data. > I guess 'zfs diff zroot/ROOT/default@auto_zroot-20250611020000 zroot/ROOT/default@auto_zroot-20250711020000' can show what happened. I know what happened on that day: I did a big upgrade of the system. However, I've done this hundreds of times on several boxes and never incurred in this problem. In any case, I tried deleting the 20250711020000 snapshot. Now the jump in refer just moved to the next:> zfs list -t all -o name,refer,used,usedbychildren,usedbydataset,usedbyrefreservation,usedbysnapshots|grep default > zroot/ROOT/default 62.1G 70.5G 0B 62.1G 0B 8.36G > ... > zroot/ROOT/default@auto_zroot-20250611020000 3.34G 215M - - - - > zroot/ROOT/default@auto_zroot-20250810020000 62.1G 116M - - - - > ... Still "zfs send" generates the same huge amount of data. bye & Thanks av.help
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