From: Alexander Abraham <a.abraham@proxmox.com>
To: pve-devel@lists.proxmox.com
Cc: Alexander Abraham <a.abraham@proxmox.com>
Subject: [pve-devel] [Typo corrected. 1/2] Section on ZFS and swap corrected.
Date: Tue, 17 Dec 2024 11:11:06 +0100 [thread overview]
Message-ID: <20241217101107.43986-2-a.abraham@proxmox.com> (raw)
In-Reply-To: <20241217101107.43986-1-a.abraham@proxmox.com>
---
local-zfs.adoc | 36 +-----------------------------------
1 file changed, 1 insertion(+), 35 deletions(-)
diff --git a/local-zfs.adoc b/local-zfs.adoc
index c64fb27..bcd02f7 100644
--- a/local-zfs.adoc
+++ b/local-zfs.adoc
@@ -627,41 +627,7 @@ You *must reboot* to activate these changes.
SWAP on ZFS
~~~~~~~~~~~
-Swap-space created on a zvol may generate some troubles, like blocking the
-server or generating a high IO load, often seen when starting a Backup
-to an external Storage.
-
-We strongly recommend to use enough memory, so that you normally do not
-run into low memory situations. Should you need or want to add swap, it is
-preferred to create a partition on a physical disk and use it as a swap device.
-You can leave some space free for this purpose in the advanced options of the
-installer. Additionally, you can lower the
-``swappiness'' value. A good value for servers is 10:
-
-----
-# sysctl -w vm.swappiness=10
-----
-
-To make the swappiness persistent, open `/etc/sysctl.conf` with
-an editor of your choice and add the following line:
-
---------
-vm.swappiness = 10
---------
-
-.Linux kernel `swappiness` parameter values
-[width="100%",cols="<m,2d",options="header"]
-|===========================================================
-| Value | Strategy
-| vm.swappiness = 0 | The kernel will swap only to avoid
-an 'out of memory' condition
-| vm.swappiness = 1 | Minimum amount of swapping without
-disabling it entirely.
-| vm.swappiness = 10 | This value is sometimes recommended to
-improve performance when sufficient memory exists in a system.
-| vm.swappiness = 60 | The default value.
-| vm.swappiness = 100 | The kernel will swap aggressively.
-|===========================================================
+It is strongly recommended to not use a ZFS volume for a swap partition because this could lead to deadlocks freezing thge affected system and other unpredictable behavior. The OpenZFS documentation, which can be viewed https://openzfs.github.io/openzfs-docs/Project%20and%20Community/FAQ.html#using-a-zvol-for-a-swap-device-on-linux[here], warns against using a ZFS volume for a swap partition.
[[zfs_encryption]]
Encrypted ZFS Datasets
--
2.39.5
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next prev parent reply other threads:[~2024-12-17 10:11 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-12-17 10:11 [pve-devel] [Typo corrected. 0/2] *** Corrections *** Alexander Abraham
2024-12-17 10:11 ` Alexander Abraham [this message]
2024-12-17 10:11 ` [pve-devel] [Typo corrected. 2/2] Split a long sentence and corrected some typos Alexander Abraham
2024-12-19 12:32 ` Fiona Ebner
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