Hello Thomas, I wanted to let you know that the maximum size of the LDISKFS backend is continuously being increased. The 16 TB limit was set a long time ago, and the current limit for LDISKFS partition size is now 1024TB. However, for development or non-production purposes, there is an option called "force_over_512tb" that allows us to ignore this limitation.
Please note that there is still a limit of 4G inodes per partition, but Lustre FS can scale by using more targets for data and metadata. Best regards, Artem Blagodarenko From: lustre-discuss <lustre-discuss-boun...@lists.lustre.org> on behalf of Thomas Roth via lustre-discuss <lustre-discuss@lists.lustre.org> Date: Friday, 2 February 2024 at 13:35 To: lustre-discuss@lists.lustre.org <lustre-discuss@lists.lustre.org> Subject: [lustre-discuss] ldiskfs / mdt size limits Hi all, confused about size limits: I distinctly remember trying to format a ~19 TB disk / LV for use as an MDT, with ldiskfs, and failing to do so: the max size for the underlying ext4 is 16 TB. Knew that, had ignoed that, but not a problem back then - just adapted the logical volume's size. Now I have a 24T disk, and neither mkfs.lustre nor Lustre itself have show any issues with it. 'df -h' does show the 24T, 'df -ih' shows the expected 4G of inodes. I suppose this MDS has a lot of space for directories and stuff, or for DOM. But why does it work in the first place? ldiskfs extends beyond all limits these days? Regards, Thomas -- -------------------------------------------------------------------- Thomas Roth Department: Informationstechnologie Location: SB3 2.291 GSI Helmholtzzentrum für Schwerionenforschung GmbH Planckstraße 1, 64291 Darmstadt, Germany, www.gsi.de Commercial Register / Handelsregister: Amtsgericht Darmstadt, HRB 1528 Managing Directors / Geschäftsführung: Professor Dr. Paolo Giubellino, Jörg Blaurock Chairman of the Supervisory Board / Vorsitzender des GSI-Aufsichtsrats: Ministerialdirigent Dr. Volkmar Dietz _______________________________________________ lustre-discuss mailing list lustre-discuss@lists.lustre.org http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org
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