Big filesystem > (4TiB) recommendations (mkfs parameter tuning?)

Big filesystem > (4TiB) recommendations (mkfs parameter tuning?)

[Justin Piszcz]

Often, on this list, there are issues where there is not enough memory, 
etc, to repair a large filesystem.

If one is going to create a 10-16TiB filesystem (for example), should one 
use the mkfs.xfs defaults, or should there be special tuning for 
filesystems of this size, so they will be less susceptible to failure for 
one reason or another?

Justin.

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Re: Big filesystem > (4TiB) recommendations (mkfs parameter tuning?)

[Eric Sandeen]

Justin Piszcz wrote:
> Often, on this list, there are issues where there is not enough memory, 
> etc, to repair a large filesystem.
> 
> If one is going to create a 10-16TiB filesystem (for example), should one 
> use the mkfs.xfs defaults, or should there be special tuning for 
> filesystems of this size, so they will be less susceptible to failure for 
> one reason or another?
> 
> Justin.

Memory to repair will depend more on total inodes on the system etc, not
so much the absolute size of the filesystem.

The defaults are defaults for a reason; they are updated when warranted,
and unless you have a specific issue with them, it's best to just stick
with that.

IOW, if best practices warranted different tuning for a generic 10-16TiB
filesystem, then the defaults would need to be updated, rather than
offering hints 'n' tips on mailing lists.  :)

-Eric

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