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 on behalf of
Thomas Roth via lustre-discuss
Date: Friday, 2 February 2024 at 13:35
To: 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
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