From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from firstgate.proxmox.com (firstgate.proxmox.com [212.224.123.68]) by lore.proxmox.com (Postfix) with ESMTPS id 3524A1FF168 for ; Tue, 4 Mar 2025 17:49:23 +0100 (CET) Received: from firstgate.proxmox.com (localhost [127.0.0.1]) by firstgate.proxmox.com (Proxmox) with ESMTP id 0AE9D62FB; Tue, 4 Mar 2025 17:49:19 +0100 (CET) Message-ID: <7c0d6e54-1f71-4c05-b4f6-00779b8d2673@proxmox.com> Date: Tue, 4 Mar 2025 17:49:15 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Beta To: Christian Ebner , Proxmox Backup Server development discussion , =?UTF-8?Q?Fabian_Gr=C3=BCnbichler?= References: <20250219164847.757184-1-c.ebner@proxmox.com> <20250219164847.757184-3-c.ebner@proxmox.com> <1741005633.eo593uhjhw.astroid@yuna.none> <1151f4cb-36f2-4bb7-9e15-1d52850cc23a@proxmox.com> Content-Language: en-GB, de-AT From: Thomas Lamprecht Autocrypt: addr=t.lamprecht@proxmox.com; keydata= xsFNBFsLjcYBEACsaQP6uTtw/xHTUCKF4VD4/Wfg7gGn47+OfCKJQAD+Oyb3HSBkjclopC5J uXsB1vVOfqVYE6PO8FlD2L5nxgT3SWkc6Ka634G/yGDU3ZC3C/7NcDVKhSBI5E0ww4Qj8s9w OQRloemb5LOBkJNEUshkWRTHHOmk6QqFB/qBPW2COpAx6oyxVUvBCgm/1S0dAZ9gfkvpqFSD 90B5j3bL6i9FIv3YGUCgz6Ue3f7u+HsEAew6TMtlt90XV3vT4M2IOuECG/pXwTy7NtmHaBQ7 UJBcwSOpDEweNob50+9B4KbnVn1ydx+K6UnEcGDvUWBkREccvuExvupYYYQ5dIhRFf3fkS4+ wMlyAFh8PQUgauod+vqs45FJaSgTqIALSBsEHKEs6IoTXtnnpbhu3p6XBin4hunwoBFiyYt6 YHLAM1yLfCyX510DFzX/Ze2hLqatqzY5Wa7NIXqYYelz7tXiuCLHP84+sV6JtEkeSUCuOiUY virj6nT/nJK8m0BzdR6FgGtNxp7RVXFRz/+mwijJVLpFsyG1i0Hmv2zTn3h2nyGK/I6yhFNt dX69y5hbo6LAsRjLUvZeHXpTU4TrpN/WiCjJblbj5um5eEr4yhcwhVmG102puTtuCECsDucZ jpKpUqzXlpLbzG/dp9dXFH3MivvfuaHrg3MtjXY1i+/Oxyp5iwARAQABzTNUaG9tYXMgTGFt cHJlY2h0IChBdXRoLTQpIDx0LmxhbXByZWNodEBwcm94bW94LmNvbT7CwY4EEwEIADgWIQQO R4qbEl/pah9K6VrTZCM6gDZWBgUCWwuNxgIbAwULCQgHAgYVCAkKCwIEFgIDAQIeAQIXgAAK CRDTZCM6gDZWBm/jD/4+6JB2s67eaqoP6x9VGaXNGJPCscwzLuxDTCG90G9FYu29VcXtubH/ bPwsyBbNUQpqTm/s4XboU2qpS5ykCuTjqavrcP33tdkYfGcItj2xMipJ1i3TWvpikQVsX42R G64wovLs/dvpTYphRZkg5DwhgTmy3mRkmofFCTa+//MOcNOORltemp984tWjpR3bUJETNWpF sKGZHa3N4kCNxb7A+VMsJZ/1gN3jbQbQG7GkJtnHlWkw9rKCYqBtWrnrHa4UAvSa9M/XCIAB FThFGqZI1ojdVlv5gd6b/nWxfOPrLlSxbUo5FZ1i/ycj7/24nznW1V4ykG9iUld4uYUY86bB UGSjew1KYp9FmvKiwEoB+zxNnuEQfS7/Bj1X9nxizgweiHIyFsRqgogTvLh403QMSGNSoArk tqkorf1U+VhEncIn4H3KksJF0njZKfilrieOO7Vuot1xKr9QnYrZzJ7m7ZxJ/JfKGaRHXkE1 feMmrvZD1AtdUATZkoeQtTOpMu4r6IQRfSdwm/CkppZXfDe50DJxAMDWwfK2rr2bVkNg/yZI tKLBS0YgRTIynkvv0h8d9dIjiicw3RMeYXyqOnSWVva2r+tl+JBaenr8YTQw0zARrhC0mttu cIZGnVEvQuDwib57QLqMjQaC1gazKHvhA15H5MNxUhwm229UmdH3KM7BTQRbC43GARAAyTkR D6KRJ9Xa2fVMh+6f186q0M3ni+5tsaVhUiykxjsPgkuWXWW9MbLpYXkzX6h/RIEKlo2BGA95 QwG5+Ya2Bo3g7FGJHAkXY6loq7DgMp5/TVQ8phsSv3WxPTJLCBq6vNBamp5hda4cfXFUymsy HsJy4dtgkrPQ/bnsdFDCRUuhJHopnAzKHN8APXpKU6xV5e3GE4LwFsDhNHfH/m9+2yO/trcD txSFpyftbK2gaMERHgA8SKkzRhiwRTt9w5idOfpJVkYRsgvuSGZ0pcD4kLCOIFrer5xXudk6 NgJc36XkFRMnwqrL/bB4k6Pi2u5leyqcXSLyBgeHsZJxg6Lcr2LZ35+8RQGPOw9C0ItmRjtY ZpGKPlSxjxA1WHT2YlF9CEt3nx7c4C3thHHtqBra6BGPyW8rvtq4zRqZRLPmZ0kt/kiMPhTM 8wZAlObbATVrUMcZ/uNjRv2vU9O5aTAD9E5r1B0dlqKgxyoImUWB0JgpILADaT3VybDd3C8X s6Jt8MytUP+1cEWt9VKo4vY4Jh5vwrJUDLJvzpN+TsYCZPNVj18+jf9uGRaoK6W++DdMAr5l gQiwsNgf9372dbMI7pt2gnT5/YdG+ZHnIIlXC6OUonA1Ro/Itg90Q7iQySnKKkqqnWVc+qO9 GJbzcGykxD6EQtCSlurt3/5IXTA7t6sAEQEAAcLBdgQYAQgAIBYhBA5HipsSX+lqH0rpWtNk IzqANlYGBQJbC43GAhsMAAoJENNkIzqANlYGD1sP/ikKgHgcspEKqDED9gQrTBvipH85si0j /Jwu/tBtnYjLgKLh2cjv1JkgYYjb3DyZa1pLsIv6rGnPX9bH9IN03nqirC/Q1Y1lnbNTynPk IflgvsJjoTNZjgu1wUdQlBgL/JhUp1sIYID11jZphgzfDgp/E6ve/8xE2HMAnf4zAfJaKgD0 F+fL1DlcdYUditAiYEuN40Ns/abKs8I1MYx7Yglu3RzJfBzV4t86DAR+OvuF9v188WrFwXCS RSf4DmJ8tntyNej+DVGUnmKHupLQJO7uqCKB/1HLlMKc5G3GLoGqJliHjUHUAXNzinlpE2Vj C78pxpwxRNg2ilE3AhPoAXrY5qED5PLE9sLnmQ9AzRcMMJUXjTNEDxEYbF55SdGBHHOAcZtA kEQKub86e+GHA+Z8oXQSGeSGOkqHi7zfgW1UexddTvaRwE6AyZ6FxTApm8wq8NT2cryWPWTF BDSGB3ujWHMM8ERRYJPcBSjTvt0GcEqnd+OSGgxTkGOdufn51oz82zfpVo1t+J/FNz6MRMcg 8nEC+uKvgzH1nujxJ5pRCBOquFZaGn/p71Yr0oVitkttLKblFsqwa+10Lt6HBxm+2+VLp4Ja 0WZNncZciz3V3cuArpan/ZhhyiWYV5FD0pOXPCJIx7WS9PTtxiv0AOS4ScWEUmBxyhFeOpYa DrEx In-Reply-To: <1151f4cb-36f2-4bb7-9e15-1d52850cc23a@proxmox.com> X-SPAM-LEVEL: Spam detection results: 0 AWL -0.039 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 RCVD_IN_VALIDITY_CERTIFIED_BLOCKED 0.001 ADMINISTRATOR NOTICE: The query to Validity was blocked. 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SPF_HELO_NONE 0.001 SPF: HELO does not publish an SPF Record SPF_PASS -0.001 SPF: sender matches SPF record Subject: Re: [pbs-devel] [PATCH proxmox 2/2] pbs api types: add option to set GC chunk cleanup wait period 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: , Reply-To: Proxmox Backup Server development discussion Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: pbs-devel-bounces@lists.proxmox.com Sender: "pbs-devel" Am 04.03.25 um 17:37 schrieb Christian Ebner: > On 3/4/25 17:01, Thomas Lamprecht wrote: >> Would be fine by me to reducing the minimum to zero. And the extra 5 >> minutes are "just to be sure" safety-margin, not a requirement for >> anything IIRC. > > Discussed this with Fabian rather extensively today. Only reason to keep > a small safety margin here is for small time drift in case of remote > storages (if they use their local time for timestamps). Ah, you mean network attached remote storage, but while your reasons below are fine, doing this for time drifts is IMO not really strong argumentation, as if one allows for no time synchronisation then there won't be a limit to the drift amount, but ... > But this can be much lower, would opt for 1 minute to stay within the > minute range. > > Also, atime always uses the coarse resolution for timestamp updates, > that will also not change with the multi-grained timestamp resolutions > in https://origin.kernel.org/doc/html/v6.13/filesystems/multigrain-ts.html > So this has to be taken into account for the atime update check, and > since setting the atime into the past will introduce other error modes > (permissions, fs impl, ...), a short wait of a 1 second in-between must > be used. > > Also, there is no distinction to be made between filesystems mounted > with atime and relatime, if the explicit atime update fails, the GC ... this actually is a strong argument, so I'm fine with a Minute as minimum. >> Maybe something with "cutoff", like just gc_cutoff or gc_atime_cutoff, >> as a cut-off of which chunks we even consider for removal is basically >> what this is. > > I would opt for gc-atime-safety-check and gc-atime-safety-margin, to > show that they are related and their implicit function meh, do not find safety-check/margin very telling and safety is a bit too generic and also slightly overused term IMO. What's wrong with cutoff? > Also, there will be no upper limit for the gc-atime-safety-margin, as > Fabian pointed out correctly, setting this to large values might be > desired to avoid data loss if something is off, and one notices from > e.g. the pending removals. I'm rather a fan of _some_ limits even if only to be proven wrong by user demand to go over that, but then we actually know the use case. As until now we got no request at all for this to be higher, IIRC, I'd go for two days. Data loss is prevented by additional copies on other servers and mediums (keyword: tape or soon s3) not some rather internal GC cut-off that provides no nice mechanism to recover any data from it, so I also do not really buy that it will be used as that in practice, we certainly should not advertise it as candidate for that. _______________________________________________ pbs-devel mailing list pbs-devel@lists.proxmox.com https://lists.proxmox.com/cgi-bin/mailman/listinfo/pbs-devel