help needed - tuning a filesystem for rm and cp ? (MORE)

[Ivan Voras]

Gore Jarold wrote:

> Ok, you are correct - I am indeed maxing out
> vfs.ufs.dirhash_mem
> 
> I have just upped it by 2x and will continue to
> monitor it.
> 
> Here is a question for any and all out there reading
> ... what would you expect would happen to a system
> that was constantly maxing out this value, sometimes
> on a sustained basis, while the activity that caused
> it went on uninterrupted ?

A slowdown. Dirhash speeds up file access when the number of files is
large (i.e. large directories). It's not required for proper function.

> I am seeing the system halt ... is it reasonable to
> think that maxing that value out on a regular,
> sustained basis would cause a system to halt ?

No, system halting or crashing points to a bug. If it's really halted
("freezed", no network or IO), someone should be able to lead you
through a debugging session.


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