[gpfsug-discuss] Inode size, and system pool subblock

[Jan Heichler]

> Am 02.08.2023 um 13:42 schrieb Olaf Weiser <olaf.weiser at de.ibm.com>:
> 
> Hallo Peter, 
> 
> [1] [...] having a smaller inode size than the subblock size means there's a big wastage on disk usage, with no performance benefit to doing so[...] 
> in short - yes 😉 
> 


The expectation that there is a waste in space seems to come from the idea that inodes are stored as individual files - which then can’t be smaller than a subblock. 

Referring to:

https://www.ibm.com/blogs/digitale-perspektive/wp-content/uploads/2020/03/04-SSSD20-SpectrumScale-Konzepte-Teil2-032020.pdf
04-SSSD20-SpectrumScale-Konzepte-Teil2-032020
PDF-Dokument · 1,2 MB


Slide 21: „Held in one invisible inode file…“

-> I would understand from that that 2kiB inodes are just ligned up in a single file and worst case you lose 2kiB because you don’t completely match your 4kiB inodes

Jan

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