by nicola for livenet research
====== Performance zfs ======
  * http://open-zfs.org/wiki/Performance_tuning#Alignment_Shift_.28ashift.29
  * http://open-zfs.org/wiki/Performance_tuning#Basic_concepts
  * https://github.com/zfsonlinux/zfs/blob/master/cmd/zpool/zpool_vdev.c#L108
  * https://www.servethehome.com/the-case-for-using-zfs-compression/
  * https://utcc.utoronto.ca/~cks/space/blog/linux/ForcedUTF8Filenames
  * https://serverfault.com/questions/74411/best-compression-for-zfs-send-recv
  * https://github.com/zfsonlinux/zfs/issues/692
  * https://www.percona.com/blog/2018/05/15/about-zfs-performance/
  * https://forums.freebsd.org/threads/help-with-zfs-and-block-size-alignment.46957/
  * https://mpolednik.github.io/2017/01/23/virtio-blk-vs-virtio-scsi/
== ssh performance ==
https://famzah.files.wordpress.com/2015/06/openssh-ciphers-performance-2015-chart.jpg
==choose correct value ashift==
  * https://illumos.topicbox.com/groups/zfs/T2cf12f740806aa96-Ma3844bffd677334735f94f3d
  * https://wiki.orzfly.com/topics/zfs-on-linux-mount-raw-pool-image
  * https://www.tecmint.com/setup-iscsi-target-and-initiator-on-debian-9/
  * http://dalaris.com/how-to-install-zfs-and-present-a-zvol-through-iscsi-in-ubuntu-14-04/
  * https://linuxacademy.com/howtoguides/posts/show/topic/21208-how-to-share-your-storage-with-iscsi
  * https://help.ubuntu.com/lts/serverguide/iscsi-initiator.html.en
  * https://linux.die.net/man/8/tgtadm
  * https://unix.stackexchange.com/questions/132797/how-to-dd-a-remote-disk-using-ssh-on-local-machine-and-save-to-a-local-disk
==understanding aio mode ==
  * https://specs.openstack.org/openstack/nova-specs/specs/mitaka/implemented/libvirt-aio-mode.html
  * https://blog.programster.org/zfs-record-size
==option of qemu==  * 
  * https://heiko-sieger.info/qemu-system-x86_64-drive-options/
  * http://people.redhat.com/pbonzini/qemu-test-doc/_build/topics/disk_005fimages.html
==native or threads==
  * https://www.reddit.com/r/VFIO/comments/9e3wwf/io_native_vs_threads_with_kvm_and_gpu_passthrough/
  * https://wiki.mikejung.biz/KVM_/_Xen
==qemu  disk with win10 performance ==
http://turlucode.com/qemu-disk-io-performance-comparison-native-or-threads-windows-10-version/


== initramfs ==
https://github.com/zfsonlinux/zfs/issues/6264

==promblems==
https://helpful.knobs-dials.com/index.php/INFO:_task_blocked_for_more_than_120_seconds.