proxmox-mirrors/pve-docs
1
0
Fork 0
mirror of https://git.proxmox.com/git/pve-docs synced 2025-05-29 18:44:07 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

followup: some clarifcations, small aditions

Browse Source 
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
This commit is contained in:
Thomas Lamprecht 2019-11-08 14:42:20 +01:00
parent 68029ec8c8
commit 51e544b624
1 changed files with 8 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
local-zfs.adoc
View File

@ -441,11 +441,11 @@ pool is used to store metadata, deduplication tables, and optionally small
file blocks. file blocks.
A `special` device can improve the speed of a pool consisting of slow spinning A `special` device can improve the speed of a pool consisting of slow spinning
hard disks with a lot of changing metadata. For example workloads that involve hard disks with a lot of metadata changes. For example workloads that involve
creating or deleting a large number of files will benefit from the presence of creating, updating or deleting a large number of files will benefit from the
a `special` device. ZFS datasets can be configured to store whole small files presence of a `special` device. ZFS datasets can also be configured to store
on the `special` device which can further improve the performance. Use SSDs for whole small files on the `special` device which can further improve the
the `special` device. performance. Use fast SSDs for the `special` device.
IMPORTANT: The redundancy of the `special` device should match the one of the IMPORTANT: The redundancy of the `special` device should match the one of the
pool, since the `special` device is a point of failure for the whole pool. pool, since the `special` device is a point of failure for the whole pool.
@ -466,14 +466,14 @@ two in the range between `512B` to `128K`. After setting the property new file
blocks smaller than `size` will be allocated on the `special` device. blocks smaller than `size` will be allocated on the `special` device.
IMPORTANT: If the value for `special_small_blocks` is greater than or equal to IMPORTANT: If the value for `special_small_blocks` is greater than or equal to
the `recordsize` of the dataset, *all* data will be written to the `special` the `recordsize` (default `128K`) of the dataset, *all* data will be written to
device, so be careful! the `special` device, so be careful!
Setting the `special_small_blocks` property on a pool will change the default Setting the `special_small_blocks` property on a pool will change the default
value of that property for all child ZFS datasets (for example all containers value of that property for all child ZFS datasets (for example all containers
in the pool will opt in for small file blocks). in the pool will opt in for small file blocks).
.Opt in for small file blocks pool-wide: .Opt in for all file smaller than 4K-blocks pool-wide:
zfs set special_small_blocks=4K <pool> zfs set special_small_blocks=4K <pool>