Thomas,
You are exactly correct that large MDTs can be useful for DoM if you have HDD
OSTs. The benefit is relatively small if you have NVMe OSTs.
If the MDT is larger than 16TB it must be formatted with the extents feature to
address block numbers over 2^32. Unfortunately, this is _slightly_
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 s
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
