Date: Tue, 14 Aug 2007 23:20:07 +0200 From: Ivan Voras <ivoras@fer.hr> To: freebsd-fs@freebsd.org Subject: Re: help needed - tuning a filesystem for rm and cp ? (MORE) Message-ID: <f9t6ag$2l0$1@sea.gmane.org> In-Reply-To: <186173.85039.qm@web63008.mail.re1.yahoo.com>
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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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