{"action":"closed","issue":{"url":"https://api.github.com/repos/zfsonlinux/zfs/issues/2279","labels_url":"https://api.github.com/repos/zfsonlinux/zfs/issues/2279/labels{/name}","comments_url":"https://api.github.com/repos/zfsonlinux/zfs/issues/2279/comments","events_url":"https://api.github.com/repos/zfsonlinux/zfs/issues/2279/events","html_url":"https://github.com/zfsonlinux/zfs/issues/2279","id":32323348,"number":2279,"title":"txg_sync constantly running on idle machine","user":{"login":"drudru","id":546,"avatar_url":"https://avatars.githubusercontent.com/u/546?v=3","gravatar_id":"","url":"https://api.github.com/users/drudru","html_url":"https://github.com/drudru","followers_url":"https://api.github.com/users/drudru/followers","following_url":"https://api.github.com/users/drudru/following{/other_user}","gists_url":"https://api.github.com/users/drudru/gists{/gist_id}","starred_url":"https://api.github.com/users/drudru/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/drudru/subscriptions","organizations_url":"https://api.github.com/users/drudru/orgs","repos_url":"https://api.github.com/users/drudru/repos","events_url":"https://api.github.com/users/drudru/events{/privacy}","received_events_url":"https://api.github.com/users/drudru/received_events","type":"User","site_admin":false},"labels":[{"url":"https://api.github.com/repos/zfsonlinux/zfs/labels/Bug%20-%20Minor","name":"Bug - Minor","color":"e11d21"},{"url":"https://api.github.com/repos/zfsonlinux/zfs/labels/Difficulty%20-%20Medium","name":"Difficulty - Medium","color":"207de5"}],"state":"closed","locked":false,"assignee":null,"milestone":null,"comments":3,"created_at":"2014-04-27T23:17:49Z","updated_at":"2015-08-19T21:06:29Z","closed_at":"2015-08-19T21:06:29Z","body":"I'm on 12.04 using ZFS on root and a large mirrored pool. No LVM is involved.\r\nThe machine is idle, yet it is constantly doing I/O.\r\nI see the process txg_sync running every second via iotop.\r\nThe system has plenty of memory and free space.\r\n\r\nI have already tried:\r\n```\r\n   echo 1 > /sys/module/zfs/parameters/zfs_arc_memory_throttle_disable\r\n```\r\n\r\nalso:\r\n\r\n```\r\n# dpkg -l | grep zfs\r\nii  dkms                                   2.2.0.3-1ubuntu3.2+zfs6~precise             Dynamic Kernel Module Support Framework\r\nii  grub-common                            1.99-21ubuntu3.9+zfs1~precise1              GRand Unified Bootloader (common files)\r\nii  grub-pc                                1.99-21ubuntu3.9+zfs1~precise1              GRand Unified Bootloader, version 2 (PC/BIOS version)\r\nii  grub-pc-bin                            1.99-21ubuntu3.9+zfs1~precise1              GRand Unified Bootloader, version 2 (PC/BIOS binaries)\r\nii  grub2-common                           1.99-21ubuntu3.9+zfs1~precise1              GRand Unified Bootloader (common files for version 2)\r\nii  libzfs1                                0.6.2-1~precise                             Native ZFS filesystem library for Linux\r\nii  libzfs2                                0.6.2-2~precise~2.gbp8db412                 Native ZFS filesystem library for Linux\r\nii  mountall                               2.36.4-zfs2                                 filesystem mounting tool\r\nii  ubuntu-zfs                             7~precise                                   Native ZFS filesystem metapackage for Ubuntu.\r\nii  zfs-dkms                               0.6.2-2~precise~2.gbp8db412                 Native ZFS filesystem kernel modules for Linux\r\nii  zfs-initramfs                          0.6.2-2~precise~2.gbp8db412                 Native ZFS root filesystem capabilities for Linux\r\nii  zfsutils                               0.6.2-2~precise~2.gbp8db412                 Native ZFS management utilities for Linux\r\n\r\n```\r\n\r\nWhat should I do to diagnose this?\r\n\r\n\r\n"}}