You original scrub took just under 4.5 hours. Have you let the second scrub run anywhere near that long? If not, start there.
The new scrub code uses a two-phase approach. First it works through metadata determining what (on-disk) blocks to scrub. Second, it does the actual scrub. This allows ZFS to coalesce the blocks and do large, sequential reads in the second phase. This dramatically speeds up the total scrub time. In contrast, the original scrub code is doing a lot of small, random reads. You might just be seeing the first phase completing in 5 minutes, but the second phase still needs to occur. Or, maybe it did part of the first phase but hit the RAM limit and needed to start the second phase. If you've let it run for 4.5 hours and it's still showing that status, then I'd say something is wrong. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to zfs-linux in Ubuntu. https://bugs.launchpad.net/bugs/1860182 Title: zpool scrub malfunction after kernel upgrade Status in zfs-linux package in Ubuntu: Triaged Bug description: I ran a zpool scrub prior to upgrading my 18.04 to the latest HWE kernel (5.3.0-26-generic #28~18.04.1-Ubuntu) and it ran properly: eric@eric-8700K:~$ zpool status pool: storagepool1 state: ONLINE scan: scrub repaired 1M in 4h21m with 0 errors on Fri Jan 17 07:01:24 2020 config: NAME STATE READ WRITE CKSUM storagepool1 ONLINE 0 0 0 mirror-0 ONLINE 0 0 0 ata-WDC_WD20EZRZ-00Z5HB0_WD-WCC4M3YFRVJ3 ONLINE 0 0 0 ata-ST2000DM001-1CH164_Z1E285A4 ONLINE 0 0 0 mirror-1 ONLINE 0 0 0 ata-WDC_WD20EZRZ-00Z5HB0_WD-WCC4M1DSASHD ONLINE 0 0 0 ata-ST2000DM006-2DM164_Z4ZA3ENE ONLINE 0 0 0 I ran zpool scrub after upgrading the kernel and rebooting, and now it fails to work properly. It appeared to finish in about 5 minutes but did not, and says it is going slow: eric@eric-8700K:~$ sudo zpool status pool: storagepool1 state: ONLINE scan: scrub in progress since Fri Jan 17 15:32:07 2020 1.89T scanned out of 1.89T at 589M/s, (scan is slow, no estimated time) 0B repaired, 100.00% done config: NAME STATE READ WRITE CKSUM storagepool1 ONLINE 0 0 0 mirror-0 ONLINE 0 0 0 ata-WDC_WD20EZRZ-00Z5HB0_WD-WCC4M3YFRVJ3 ONLINE 0 0 0 ata-ST2000DM001-1CH164_Z1E285A4 ONLINE 0 0 0 mirror-1 ONLINE 0 0 0 ata-WDC_WD20EZRZ-00Z5HB0_WD-WCC4M1DSASHD ONLINE 0 0 0 ata-ST2000DM006-2DM164_Z4ZA3ENE ONLINE 0 0 0 errors: No known data errors ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: zfsutils-linux 0.7.5-1ubuntu16.7 ProcVersionSignature: Ubuntu 5.3.0-26.28~18.04.1-generic 5.3.13 Uname: Linux 5.3.0-26-generic x86_64 NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair ApportVersion: 2.20.9-0ubuntu7.9 Architecture: amd64 CurrentDesktop: ubuntu:GNOME Date: Fri Jan 17 16:22:01 2020 InstallationDate: Installed on 2018-03-07 (681 days ago) InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20180105.1) SourcePackage: zfs-linux UpgradeStatus: Upgraded to bionic on 2018-08-02 (533 days ago) modified.conffile..etc.sudoers.d.zfs: [inaccessible: [Errno 13] Permission denied: '/etc/sudoers.d/zfs'] To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/zfs-linux/+bug/1860182/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
