From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: <d.csapak@proxmox.com> 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 44D92B9E88 for <pbs-devel@lists.proxmox.com>; Tue, 12 Dec 2023 15:34:57 +0100 (CET) Received: from firstgate.proxmox.com (localhost [127.0.0.1]) by firstgate.proxmox.com (Proxmox) with ESMTP id 276DA36537 for <pbs-devel@lists.proxmox.com>; Tue, 12 Dec 2023 15:34:27 +0100 (CET) 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 for <pbs-devel@lists.proxmox.com>; Tue, 12 Dec 2023 15:34:26 +0100 (CET) Received: from proxmox-new.maurer-it.com (localhost.localdomain [127.0.0.1]) by proxmox-new.maurer-it.com (Proxmox) with ESMTP id D3357468A9 for <pbs-devel@lists.proxmox.com>; Tue, 12 Dec 2023 15:34:25 +0100 (CET) From: Dominik Csapak <d.csapak@proxmox.com> To: pbs-devel@lists.proxmox.com Date: Tue, 12 Dec 2023 15:34:25 +0100 Message-Id: <20231212143425.1844448-3-d.csapak@proxmox.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20231212143425.1844448-1-d.csapak@proxmox.com> References: <20231212143425.1844448-1-d.csapak@proxmox.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SPAM-LEVEL: Spam detection results: 0 AWL 0.020 Adjusted score from AWL reputation of From: address BAYES_00 -1.9 Bayes spam probability is 0 to 1% DMARC_MISSING 0.1 Missing DMARC policy 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 T_SCC_BODY_TEXT_LINE -0.01 - Subject: [pbs-devel] [PATCH proxmox-backup 3/3] docs: tape: add lto 9 considerations X-BeenThere: pbs-devel@lists.proxmox.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: Proxmox Backup Server development discussion <pbs-devel.lists.proxmox.com> List-Unsubscribe: <https://lists.proxmox.com/cgi-bin/mailman/options/pbs-devel>, <mailto:pbs-devel-request@lists.proxmox.com?subject=unsubscribe> List-Archive: <http://lists.proxmox.com/pipermail/pbs-devel/> List-Post: <mailto:pbs-devel@lists.proxmox.com> List-Help: <mailto:pbs-devel-request@lists.proxmox.com?subject=help> List-Subscribe: <https://lists.proxmox.com/cgi-bin/mailman/listinfo/pbs-devel>, <mailto:pbs-devel-request@lists.proxmox.com?subject=subscribe> X-List-Received-Date: Tue, 12 Dec 2023 14:34:57 -0000 LTO-9 requires a bit of special handling while formatting/first use, so document that, so nobody is suprised by this behaviour. Signed-off-by: Dominik Csapak <d.csapak@proxmox.com> --- docs/tape-backup.rst | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/docs/tape-backup.rst b/docs/tape-backup.rst index 2d673374..c528d578 100644 --- a/docs/tape-backup.rst +++ b/docs/tape-backup.rst @@ -98,6 +98,31 @@ so it takes 33 hours to read the 12TB needed to fill up an LTO-8 tape. If you wa to write to your tape at full speed, please make sure that the source datastore is able to deliver that performance (for example, by using SSDs). +LTO-9+ considerations +~~~~~~~~~~~~~~~~~~~~ + +Since LTO-9, it is necessary to initialize new media in your drives, this is +called `Media Optimization`. This usually takes between 40 and 120 minutes per +medium. It is recommended to initialize your media in this manner with the +tools provided by your hardware vendor of your drive or changer. Some tape +changers have a method to 'bulk' initialize your media. + +Because of this, formatting tapes is handled differently in Proxmox Backup +Server to avoid re-optimizing on each format/labelling. If you want to format +your media for use with the Proxmox Backup Server the first time or after use +with another program, either use the functionality of your drive/changer, or +use the 'slow' format on the cli: + +.. code-block:: console + + # proxmox-tape format --drive your-drive --fast 0 + +This will completely remove all pre-existing data and trigger a `Media +Optimization` pass. + +If you format a partitioned LTO-9 medium with the 'fast' method (the default or +by setting `--fast 1`), only the first partition will be formatted, so make +sure to use the 'slow' method. Terminology ----------- -- 2.30.2