Is there any hope that a swap on zvol with sync=standard at least
doesn't hang/deadlock? Like:
zfs create rpool/swap -V 2G -b $(getconf PAGESIZE) -o logbias=throughput
-o sync=always -o primarycache=metadata -o secondarycache=none
In my testing this didn't hang when swap got hit.
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** Changed in: zfs-linux (Ubuntu)
Status: Triaged => Won't Fix
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https://bugs.launchpad.net/bugs/1847628
Title:
When using swap in ZFS, system stops when you start using swap
To
** Changed in: zfs
Status: Unknown => New
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Title:
When using swap in ZFS, system stops when you start using swap
To manage notifications
Yes this is confirmed, there is currently no way to use swap on zvol
without a deadlock. The only solution at the moment is to create a swap
partition.
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@jibel unfortunately that doesn't help, still stalling when writing to
swap, even without compression.
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Title:
When using swap in ZFS, system
upstream proposal is to force everything through ZIL by creating the
swap like this:
zfs create -o sync=always -o primarycache=metadata -o
secondarycache=none -o logbias=throughput -b 4K -V 8G rpool/swap
I'll test with our setup on Ubuntu.
** Changed in: zfs-linux (Ubuntu)
Assignee:
** Changed in: zfs-linux (Ubuntu)
Importance: Undecided => Critical
** Tags removed: rls-ee-incoming
** Tags added: rls-ff-incoming
** Changed in: zfs-linux (Ubuntu)
Importance: Critical => High
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This bug was fixed in the package ubiquity - 19.10.21
---
ubiquity (19.10.21) eoan; urgency=medium
[ Dimitri John Ledkov ]
* scripts/plugininstall.py: skip installing extras with multiarch
dependencies in the first pass.
[ Mathieu Trudel-Lapierre ]
* Updated translations
** Changed in: ubuntu-release-notes
Status: New => Fix Released
** Changed in: ubiquity (Ubuntu)
Status: Incomplete => Triaged
** Changed in: zfs-linux (Ubuntu)
Status: Incomplete => Triaged
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> Or are you saying, that zfs zvol swap shouldn't be created either,
> since that is known to cause lockups?
That is correct. As per the thread at the attached github zfsonlinux bug
report, zfs zvol swap causes system freezes for minutes at a time, and
under enough memory pressure will lock up
> "com.sun:auto-snapshot=false" do we need to add that or does our zfs
not support it?
You do not need that. That is used by some snapshot tools, but Ubuntu is
doing its own zsys thing.
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partman-swapfile does not create swapfiles on neither btrfs nor zfs.
when using desktop installer and choosing zfs a zfs zvol is created for
swap.
it uses all the settings seen in the guide, but the "com.sun:auto-
snapshot=false" do we need to add that or does our zfs not support it?
Or are you
** Also affects: ubuntu-release-notes
Importance: Undecided
Status: New
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Title:
When using swap in ZFS, system stops when you start
** Bug watch added: Github Issue Tracker for ZFS #7734
https://github.com/zfsonlinux/zfs/issues/7734
** Also affects: zfs via
https://github.com/zfsonlinux/zfs/issues/7734
Importance: Unknown
Status: Unknown
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** Tags added: rls-ee-incoming
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Title:
When using swap in ZFS, system stops when you start using swap
To manage notifications about this bug go
** Changed in: ubiquity (Ubuntu)
Importance: Undecided => High
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Title:
When using swap in ZFS, system stops when you start using swap
To
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: ubiquity (Ubuntu)
Status: New => Confirmed
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Title:
** Also affects: ubiquity (Ubuntu)
Importance: Undecided
Status: New
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Title:
When using swap in ZFS, system stops when you start using
Confirmed this affects me. 16gig of ram, and a swap ZVOL. When memory
gets low the system freezes for several minutes.
Also reported this bug here: https://bugs.launchpad.net/ubuntu/+source
/zfs-linux/+bug/1848102
As I believe ubiquity shouldn't be creating a ZVOL for swap when this is
a known
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: zfs-linux (Ubuntu)
Status: New => Confirmed
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Title:
I did the same test for USB flash memory and it works normally.
try create a swap on zvol, it's definitely not working well..
===
jehos@MacBuntu:~$ sudo fdisk -l /dev/sdc
Disk /dev/sdc: 7.46 GiB, 8002732032 bytes, 15630336 sectors
@colin-king
> A swapfile on ZFS is a bad idea. Swapped out pages get pushed through
the vfs into zfs and each page of swap will be magnified in the number
of free pages required to get this page out to disk.
currently, swap uses zvol in default. not a swapfile. (actually I also
thinking swapfile
https://github.com/zfsonlinux/pkg-zfs/wiki/HOWTO-use-a-zvol-as-a-swap-
device
..there are known issues with swap on ZFS not working well on heavily
memory loaded systems.
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A swapfile on ZFS is a bad idea. Swapped out pages get pushed through
the vfs into zfs and each page of swap will be magnified in the number
of free pages required to get this page out to disk.
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