From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from firstgate.proxmox.com (firstgate.proxmox.com [212.224.123.68]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by lists.proxmox.com (Postfix) with ESMTPS id 8B78B7677D for ; Fri, 23 Apr 2021 13:08:24 +0200 (CEST) Received: from firstgate.proxmox.com (localhost [127.0.0.1]) by firstgate.proxmox.com (Proxmox) with ESMTP id 812E328435 for ; Fri, 23 Apr 2021 13:08:24 +0200 (CEST) Received: from proxmox-new.maurer-it.com (proxmox-new.maurer-it.com [94.136.29.106]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by firstgate.proxmox.com (Proxmox) with ESMTPS id E830528426 for ; Fri, 23 Apr 2021 13:08:23 +0200 (CEST) Received: from proxmox-new.maurer-it.com (localhost.localdomain [127.0.0.1]) by proxmox-new.maurer-it.com (Proxmox) with ESMTP id 1A23A44F81 for ; Fri, 23 Apr 2021 13:02:34 +0200 (CEST) From: =?UTF-8?q?Fabian=20Gr=C3=BCnbichler?= To: pbs-devel@lists.proxmox.com Date: Fri, 23 Apr 2021 13:02:29 +0200 Message-Id: <20210423110229.1425470-1-f.gruenbichler@proxmox.com> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-SPAM-LEVEL: Spam detection results: 0 AWL 0.032 Adjusted score from AWL reputation of From: address KAM_DMARC_STATUS 0.01 Test Rule for DKIM or SPF Failure with Strict Alignment SPF_HELO_NONE 0.001 SPF: HELO does not publish an SPF Record SPF_PASS -0.001 SPF: sender matches SPF record Subject: [pbs-devel] [PATCH proxmox-backup] docs: add zfs_arc_min < zfs_arc_max note X-BeenThere: pbs-devel@lists.proxmox.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: Proxmox Backup Server development discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 23 Apr 2021 11:08:24 -0000 Signed-off-by: Fabian Grünbichler --- Notes: this can happen via the PVE integration, which always sets the base64 flag except for the special value '/'. docs/local-zfs.rst | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/docs/local-zfs.rst b/docs/local-zfs.rst index f36aefe8..bc20c841 100644 --- a/docs/local-zfs.rst +++ b/docs/local-zfs.rst @@ -246,6 +246,19 @@ host. Use your preferred editor to change the configuration in This example setting limits the usage to 8GB. +.. IMPORTANT:: In case your desired `zfs_arc_max` value is lower than or equal to + `zfs_arc_min` (which defaults to 1/32 of the system memory), `zfs_arc_max` + will be ignored unless you also set `zfs_arc_min` to at most `zfs_arc_max - + 1`. + +.. code-block:: console + + options zfs zfs_arc_max=8589934592 zfs_arc_min=8589934591 + +For example, to set the target ARC size to 8GB on a system with 256GB of total +memory (or more), `zfs_arc_min` needs to be set to `8GB - 1` (`zfs_arc_max - +1`) in order for `zfs_arc_max` to be honored. + .. IMPORTANT:: If your root file system is ZFS you must update your initramfs every time this value changes: .. code-block:: console -- 2.20.1