Public bug reported: ZFS-on-Linux has its own I/O scheduler, so it sets the "noop" elevator on whole disks used in a pool. https://github.com/zfsonlinux/zfs/issues/90
It does not set the scheduler for a disk if a partition is used in a pool out of respect for the possibility that there are non-ZFS partitions on the same disk. https://github.com/zfsonlinux/zfs/issues/152 For regular pools, the recommendation is to use whole disks. For a root pools, it's just the opposite. The typical case is that partitions are used. And, for root pools, it is unlikely that the same disks have non- ZFS filesystems. Therefore, I think we want to set the "noop" scheduler for disks in the root pool. ** Affects: zfs-linux (Ubuntu) Importance: Undecided Status: New ** Description changed: ZFS-on-Linux has its own I/O scheduler, so it sets the "noop" elevator - on whole disks used in a pool. It does not set the scheduler for a disk - if a partition is used in a pool out of respect for the possibility that - there are non-ZFS partitions on the same disk. + on whole disks used in a pool. See: + https://github.com/zfsonlinux/zfs/issues/90 + + It does not set the scheduler for a disk if a partition is used in a + pool out of respect for the possibility that there are non-ZFS + partitions on the same disk. For regular pools, the recommendation is to use whole disks. For a root pools, it's just the opposite. The typical case is that partitions are used. And, for root pools, it is unlikely that the same disks have non- ZFS filesystems. Therefore, I think we want to set the "noop" scheduler for disks in the root pool. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1550301 Title: ZFS: Set elevator=noop on disks in the root pool To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/zfs-linux/+bug/1550301/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
