Date: Tue, 5 Oct 1999 18:13:11 -0500 (CDT) From: Kevin Day <toasty@dragondata.com> To: abial@webgiro.com (Andrzej Bialecki) Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: Non-standard FFS parameters Message-ID: <199910052313.SAA52090@celery.dragondata.com> In-Reply-To: <Pine.BSF.4.05.9910052244450.11622-100000@freja.webgiro.com> from "Andrzej Bialecki" at Oct 05, 1999 10:56:44 PM
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>
> Hi,
>
> The system in question (3.3-stable) needs to use a large FS (ca. 40GB).
> The defaults for such filesystem are ridiculous, given that it will hold
> at most couple of hundred big data files. So, my question is:
>
> * should I change the cpg (default 16) to some bigger value?
> * is it safe to run production system with non-standard block and fragment
> size (e.g. 32768 and 4096)?
> * what maximum value can I use for -i (bytes per inode) parmeter? I
> aalready tried 16mln ...
> * and finally, how th above choices affect the FS performance in my case?
>
One thing that bit me before....
(from the newfs man page)
BUGS
The boot code of FreeBSD assumes that the file system that carries the
kernel has blocks of 8 kilobytes and fragments of 1 kilobyte. You will
not be able to boot from a file system that uses another size.
Kevin
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