Public bug reported:
We run Ubuntu 24.04 server as an NFS server to export ~850 home
directories. Each home directory is a ZFS dataset with a refquota set.
The home directories are exported to ~35 clients (usually Ubuntu 24.04)
using NFS version 4.2.
The problem occurs when a home directory reaches its refquota and the
client still tries to write to that dataset. This causes severe delays
for all NFS clients accessing any dataset on the server. Turning
compression on or off does not seem to affect the problem.
The problem can be mitigated temporarily by increasing the refquota of
the full dataset that is being written to. However, this approach
renders quotas virtually useless.
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: linux-image-6.14.0-28-generic 6.14.0-28.28~24.04.1
ProcVersionSignature: Ubuntu 6.14.0-28.28~24.04.1-generic 6.14.8
Uname: Linux 6.14.0-28-generic x86_64
NonfreeKernelModules: zfs
AlsaDevices:
total 0
crw-rw---- 1 root audio 116, 1 Aug 20 11:44 seq
crw-rw---- 1 root audio 116, 33 Aug 20 11:44 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.28.1-0ubuntu3.8
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq',
'/dev/snd/timer'] failed with exit code 1:
CRDA: N/A
CasperMD5CheckResult: unknown
Date: Wed Nov 19 12:47:50 2025
InstallationDate: Installed on 2025-02-03 (289 days ago)
InstallationMedia: Ubuntu-Server 24.04.1 LTS "Noble Numbat" - Release amd64
(20240827)
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
MachineType: Supermicro Super Server
PciMultimedia:
ProcEnviron:
LANG=en_US.UTF-8
LC_COLLATE=C
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm
ProcFB: 0 astdrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-6.14.0-28-generic
root=UUID=7bb8dd38-1263-435f-82da-c39868fa4201 ro
RebootRequiredPkgs: Error: path contained symlinks.
RelatedPackageVersions:
linux-restricted-modules-6.14.0-28-generic N/A
linux-backports-modules-6.14.0-28-generic N/A
linux-firmware 20240318.git3b128b60-0ubuntu2.17
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SourcePackage: linux-hwe-6.14
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/23/2022
dmi.bios.release: 5.22
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 2.5
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: H12SSW-NTR
dmi.board.vendor: Supermicro
dmi.board.version: 1.02
dmi.chassis.asset.tag: To be filled by O.E.M.
dmi.chassis.type: 17
dmi.chassis.vendor: Supermicro
dmi.chassis.version: 0123456789
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvr2.5:bd09/23/2022:br5.22:svnSupermicro:pnSuperServer:pvr0123456789:rvnSupermicro:rnH12SSW-NTR:rvr1.02:cvnSupermicro:ct17:cvr0123456789:skuTobefilledbyO.E.M.:
dmi.product.family: To be filled by O.E.M.
dmi.product.name: Super Server
dmi.product.sku: To be filled by O.E.M.
dmi.product.version: 0123456789
dmi.sys.vendor: Supermicro
** Affects: linux-hwe-6.14 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug noble
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https://bugs.launchpad.net/bugs/2131927
Title:
NFS clients writing to over quota ZFS datasets cause severe delays
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