From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: <pbs-devel-bounces@lists.proxmox.com> Received: from firstgate.proxmox.com (firstgate.proxmox.com [IPv6:2a01:7e0:0:424::9]) by lore.proxmox.com (Postfix) with ESMTPS id B7DC21FF396 for <inbox@lore.proxmox.com>; Thu, 23 May 2024 10:10:35 +0200 (CEST) Received: from firstgate.proxmox.com (localhost [127.0.0.1]) by firstgate.proxmox.com (Proxmox) with ESMTP id 109881AAF5; Thu, 23 May 2024 10:10:53 +0200 (CEST) Message-ID: <2b34b96c-5c73-4827-8dac-12f73229b017@proxmox.com> Date: Thu, 23 May 2024 10:10:19 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Beta To: Dominik Csapak <d.csapak@proxmox.com>, Proxmox Backup Server development discussion <pbs-devel@lists.proxmox.com> References: <20240514141248.1614306-1-d.csapak@proxmox.com> <20240514141248.1614306-2-d.csapak@proxmox.com> <dab1e1be-d2c8-48f2-bb32-60337ac14127@proxmox.com> <e715b490-2b5f-47c2-ae40-52929872627c@proxmox.com> Content-Language: en-GB, de-AT From: Thomas Lamprecht <t.lamprecht@proxmox.com> Autocrypt: addr=t.lamprecht@proxmox.com; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: pbs-devel-bounces@lists.proxmox.com Sender: "pbs-devel" <pbs-devel-bounces@lists.proxmox.com> Am 23/05/2024 um 08:09 schrieb Dominik Csapak: > On 5/22/24 19:24, Thomas Lamprecht wrote: >> What your commit did not mention is why you skip setting a few others, like I >> could imagine that the following would have some use:> - DATE AND TIME LAST WRITTEN > > i hesitated with this one as there is no timezone included and it does not > specify one either, but i guess we could just use UTC (although that might > be confusing for some people?) Ok, that is a good point, and yeah a shame that the spec didn't make this field 17 bytes wide, allowing to encode a [+-]ZZZZ UTC-timezone difference. While for small setups in just one location, or set to the same timezone in the whole organisation, independent of where the servers are located, in can be even nice to use the local timezone, that still is a loss of information.. Using UTC and documenting that is the only way to allow being sure of what the actual time the tape was written to is in any timezone. So, I'd go for UTC here and document that. If we ever show this in the UI or CLI we can render it correctly as ISO 8601 indicating that this is UTC time. > >> - TEXT LOCALIZATION IDENTIFIER (Strings are UTF-8 in rust, and we do not >> explicitly keep them in ASCII or the like FWICT) > > that one i explicitly left out because we (currently) only write ascii, > but yes, we could simply set that to utf-8 for "future-proof"ness This is mostly enforced indirectly currently or? As the label depends on the pool name and that one is enforced to match the "safe" regex? In that case it might be good to either future-proof or alternatively, IMO not really better, to at least enforce/check that the saved text is ascii directly here, as the data is a String, which is utf-8 in rust, so coupling the assumption here to the rather distanced API schema format seems not ideal to me. btw. enforcing the length might be nice too, what would actually happen if one writes more data than reserved by the spec, does it spill into the next field, does something catches this and errors out? > - APPLICATION FORMAT VERSION (always good to have) > > isn't that implicated by the application version ? Not necessarily, there can be a new way to write tapes from PBS in the future and the version to use might be selectable, or the newer one backported to an older stable version (at least as option). IME, tracking format and program versions as separate things makes life only easier in the long run. > > we don't really have a 'format version' for the tape format, but each > archive on it has it's own version e.g. the snapshot archives > have version 1.2 while the chunk archive and catalog archive have 1.1 > and the labels have only 1.0 You could combine those atoms that make out the whole tape format into a full version by concatenating them with a separator like semicolon or a plus or the like. As this field has 16 characters you could even prefix each version with a letter to make it slightly simpler to read, e.g.: A1.2;C1.1;L1.0 Or use the letter as separator, making a bit more space for future version extension: A1.2C1.1L1.0 We could even use that now to define a global tape version or a, well, versioning-version: T1.0A1.2C1.1L1.0 A bit crowded but any (future) command of ours that outputs this information could format that nicely and documenting it should cover third party tools. >> >> Not so sure from top of my head about the UIDS, i.e., if we even have something >> that can be easily mapped to this. > > not sure which field you mean here? in LTO-5 there is only one standardized > field left and that is the VOLUME COHERENCY INFORMATION > and i don't think we'll need that At least in LTO-9 there would be "MEDIUM GLOBALLY UNIQUE IDENTIFIER" and "MEDIA POOL GLOBALLY UNIQUE IDENTIFIER", differing per LTO version shouldn't (hopefully) be an issue, but probably not _that_ important, at least if we do not have existing information that can be mapped 1:1 to those two fields already. btw. there's also BARCODE, as we support barcode labeling, it might be good to write that out too I guess? _______________________________________________ pbs-devel mailing list pbs-devel@lists.proxmox.com https://lists.proxmox.com/cgi-bin/mailman/listinfo/pbs-devel