This appears to be a relevant fix
https://github.com/openzfs/zfs/commit/45f0437912f4688bb15b353c8773b0e37e0b1a89
** Changed in: zfs-linux (Ubuntu)
Assignee: (unassigned) => Colin Ian King (colin-king)
** Changed in: zfs-linux (Ubuntu)
Status: New => Incomplete
** Changed in: zfs-linux (Ubuntu)
Status: Incomplete => In Progress
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https://bugs.launchpad.net/bugs/1840161
Title:
Very severe regression in ZFS 0.7.12 in 18.04.3
Status in zfs-linux package in Ubuntu:
In Progress
Bug description:
ZFS version 0.7.12 has a documented very severe regression on sending
and receiving datasets with dnodesize=auto set on the dataset (not
present in 0.7.9 or 0.8.1). This manifests itself primarily when
sending and receiving datasets with lots of files, such as happens if
root is on ZFS. This issue has been documented on the ZFSonlinux git
repositories in issues:
https://github.com/zfsonlinux/zfs/issues/9147
and
https://github.com/zfsonlinux/zfs/issues/8458
Since 0.7.12 was just brought into 18.04.3, this regression is now
affecting LTS. I'm opening this issue in the hopes that the fix is
backported to the LTS release
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