Date: 19 Oct 2001 13:26:20 -0400 From: Randell Jesup <rjesup@wgate.com> To: tlambert2@mindspring.com Cc: Ollivier Robert <roberto@keltia.freenix.fr>, freebsd-arch@FreeBSD.ORG, Matt Dillon <dillon@earth.backplane.com> Subject: Re: cvs commit: src/sbin/newfs newfs.8 newfs.c Message-ID: <0000479c054b4307d1@[192.168.1.4]> In-Reply-To: Terry Lambert's message of "Fri, 19 Oct 2001 09:38:01 -0700" References: <200110110851.f9B8ptf60343@freefall.freebsd.org><20011011112527.A54224@coffee.q9media.com><20011011154203.C44561@dragon.nuxi.com><20011013143225.B4527@ns2.freenix.org><20011013172706.A53976@dragon.nuxi.com><20011014160303.A22301@ns2.freenix.org><20011014194232.A50125@dragon.nuxi.com><00005ba2015f4b07d1@[192.168.1.4]> <0000157003191707d1@[192.168.1.4]><20011018225023.B41916@tara.freenix.org><0000471a054ac107d1@[192.168.1.4]>
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Terry Lambert <tlambert2@mindspring.com> writes:
>Ollivier Robert wrote:
>> According to Randell Jesup:
>> > So, do we really have problems with 16k/4k/64? If so, let's fix the
>> > problems.
>>
>> I don't know really if we have problems with something other than a 8:1 ratio
>> but 4k is too big IMO and wastes too much space.
Bruce Evans noted that there's a bug in my disklabel.c patch that's
been in for 7 months, and frag is set to 0 if the user didn't specify it by
hand. newfs considers frag of 0 to be 1024, and also limits block size to
8*frag, so the default actually was 8192/1024
>There are some obvious problems with any frag size larger than
>the physical disk block side, when it comes to guaranteeing the
>atomicity of the writes in a situation where the system is not
>stable (e.g. connected to the power grid in California).
1024 is larger than physical disk sector size too. The FS should
deal with this possibility anyways.
--
Randell Jesup, Worldgate Communications, ex-Scala, ex-Amiga OS team
rjesup@wgate.com
"They that can give up essential liberty to obtain a little temporary safety
deserve neither liberty nor safety."
-Benjamin Franklin, Historical Review of Pennsylvania, 1759.
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