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installation: document advanced ZFS options

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Additionally add a note that no swap is created when ZFS is selected.

Signed-off-by: Stoiko Ivanov <s.ivanov@proxmox.com>
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Stoiko Ivanov 2018-11-23 18:24:04 +01:00 committed by Dietmar Maurer
parent dc74fc6389
commit 71280de08f
1 changed files with 38 additions and 4 deletions
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pve-installation.adoc
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@ -94,10 +94,11 @@ defaults to `ext4`. The installer uses LVM if you select `ext3`,
`ext4` or `xfs` as file system, and offers additional option to
restrict LVM space (see <<advanced_lvm_options,below>>)
If you have more than one disk, you can also use ZFS as file system.
ZFS supports several software RAID levels, so this is specially useful
if you do not have a hardware RAID controller. The `Options` button
lets you select the ZFS RAID level, and you can choose disks there.
You can also use ZFS as file system. ZFS supports several software RAID
levels, so this is specially useful if you do not have a hardware RAID
controller. The `Options` button lets you select the ZFS RAID level, and
you can choose disks there. Additionally you can set additional options (see
<<advanced_zfs_options,below>>).
[thumbnail="screenshot/pve-select-location.png", float="left"]
@ -204,6 +205,39 @@ will be used.
NOTE: LVM requires free space in the VG for snapshot creation (not
required for lvmthin snapshots).
[[advanced_zfs_options]]
Advanced ZFS Configuration Options
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The installer creates a ZFS pool `rpool`. When selecting ZFS, no swap space is
created by default. You can leave some unpartitioned space for swap or create
a swap zvol after installation, though the latter can lead to problems
(see <<zfs_swap,ZFS swap notes>>).
`ashift`::
Defines the `ashift` value for the created pool. The `ashift` needs
to be set at least to the sector-size of the underlying disks (2 to
the power of `ashift` is the sector-size), or any disk,
which might be put in the pool (e.g. during replacing a defective disk).
`compress`::
Defines whether compression is enabled for `rpool`.
`checksum`::
Defines which checksumming algorithm should be used for `rpool`.
`copies`::
Defines the `copies` parameter for `rpool`. Check the `zfs(8)` manpage for the
semantics, and why this does not replace redundancy on disk-level.
`hdsize`::
Defines the total HD size to be used. This way you can save free
space on the HD for further partitioning (e.g. for creating a swap-partition).
ZFS Performance Tips
~~~~~~~~~~~~~~~~~~~~