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docs: local-zfs: minor cleanup and adaptation 

fixes a few small glitches in the markup.

rephrases a few PVEisms (PBS will not swap when starting a backup to
an external storage)

add zstd to available compression algorithms

Signed-off-by: Stoiko Ivanov <s.ivanov@proxmox.com>
This commit is contained in:
Stoiko Ivanov 2022-05-11 14:06:34 +00:00 committed by Thomas Lamprecht
parent 09d903034f
commit 0ae5f76277
1 changed files with 9 additions and 7 deletions
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16
docs/local-zfs.rst
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@ -191,12 +191,12 @@ With `systemd-boot`:
.. code-block:: console
# pve-efiboot-tool format <new disk's ESP>
# pve-efiboot-tool init <new disk's ESP>
# proxmox-boot-tool format <new ESP>
# proxmox-boot-tool init <new ESP>
.. NOTE:: `ESP` stands for EFI System Partition, which is setup as partition #2 on
bootable disks setup by the {pve} installer since version 5.4. For details, see
xref:sysboot_systemd_boot_setup[Setting up a new partition for use as synced ESP].
bootable disks setup by the `Proxmox Backup`_ installer. For details, see
:ref:`Setting up a new partition for use as synced ESP <systembooting-proxmox-boot-setup>`.
With `grub`:
@ -254,6 +254,7 @@ The above example limits the usage to 8 GiB ('8 * 2^30^').
configuration in `/etc/modprobe.d/zfs.conf`, with:
.. code-block:: console
options zfs zfs_arc_min=8589934591
options zfs zfs_arc_max=8589934592
@ -273,8 +274,7 @@ Swap on ZFS
^^^^^^^^^^^
Swap-space created on a zvol may cause some issues, such as blocking the
server or generating a high IO load, often seen when starting a Backup
to an external Storage.
server or generating a high IO load.
We strongly recommend using enough memory, so that you normally do not
run into low memory situations. Should you need or want to add swap, it is
@ -311,18 +311,20 @@ ZFS compression
^^^^^^^^^^^^^^^
To activate compression:
.. code-block:: console
# zpool set compression=lz4 <pool>
We recommend using the `lz4` algorithm, since it adds very little CPU overhead.
Other algorithms such as `lzjb` and `gzip-N` (where `N` is an integer from `1-9`
Other algorithms such as `lzjb`, `zstd` and `gzip-N` (where `N` is an integer from `1-9`
representing the compression ratio, where 1 is fastest and 9 is best
compression) are also available. Depending on the algorithm and how
compressible the data is, having compression enabled can even increase I/O
performance.
You can disable compression at any time with:
.. code-block:: console
# zfs set compression=off <dataset>