ZFS needs a lazytime property to set lazytime mount option

openzfs / zfs

OpenZFS on Linux and FreeBSD

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ZFS needs a lazytime property to set lazytime mount option #9843

Open clinta opened 4 years ago

clinta commented 4 years ago

System information

Type	Version/Name
Distribution Name	Arch Linux
Linux Kernel	5.4.10
Architecture	x86_64
ZFS Version	0.8.2-1
SPL Version	0.8.2-1

ZFS supports lazytime, and datasets can be mounted with lazytime by running mount -o remount,lazytime tank/foo, but there is no property in the dataset to influence lazytime so that zfs mount tank/foo will set lazytime on.

smopucilowski commented 3 years ago

Bump? This would be a nice feature to have.

clinta commented 3 years ago

I agree, I'd still like to see this added. Unfortunately for me trying to implemented it resulted in a discussion of redesigning the atime interface, and that's a bit beyond my skills.

devZer0 commented 1 year ago

yes please! and perhaps make lazytime perhaups the default

i found that atime in zfs can cause pathological slowness, so i wonder why an instant read on virtual disk files should hammer the disks with atime updates, slowing don qemu disk image conversion to a crawl

see https://forum.proxmox.com/threads/weird-disk-write-i-o-pattern-on-source-disks-when-moving-virtual-disk.123639/

knutov commented 1 year ago

What is the current state of this feature? Is it planned?

Support of LAZYTIME was added to code long time ago - https://github.com/openzfs/zfs/commit/704cd0758a1a4ecef47b0dfa097acd94c8e4f57d

marcogabriel commented 7 months ago

Indeed, although it was committed in April 2016 the lazytime property still seems to be missing from the release. Will there be a chance to see the lazytime property in zfs?