On Fri, 2003-04-11 at 02:24, Robert Sander wrote:
> Hi!
>
> When creating an XFS volume on an external hardware RAID which has a
> stripe size of 128 1024k blocks, what are the preffered values for sunit
> and swidth.
> Or is there no performance degrade when using mkfs.xfs without
> specifying sunit and swidth explicitely? In that case sunit and swidth
> are set to 0.
With all due respect to the XFS guys, the manpage section on sunit and
swidth is very confusing. Would someone be willing to write up a more
understandable explanation and post it to the FAQ since
sunit/swidth-related questions do come up relatively frequently? (Not
me, because I don't fully understand the options either...)
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#!/usr/bin/perl -w
$_='while(read+STDIN,$_,2048){$a=29;$b=73;$c=142;$t=255;@t=map
{$_%16or$t^=$c^=($m=(11,10,116,100,11,122,20,100)[$_/16%8])&110;
$t^=(72,@z=(64,72,$a^=12*($_%16-2?0:$m&17)),$b^=$_%64?12:0,@z)
[$_%8]}(16..271);if((@a=unx"C*",$_)[20]&48){$h=5;$_=unxb24,join
"",@b=map{xB8,unxb8,chr($_^$a[--$h+84])}@ARGV;s/...$/1$&/;$d=
unxV,xb25,$_;$e=256|(ord$b[4])<<9|ord$b[3];$d=$d>>8^($f=$t&($d
>>12^$d>>4^$d^$d/8))<<17,$e=$e>>8^($t&($g=($q=$e>>14&7^$e)^$q*
8^$q<<6))<<9,$_=$t[$_]^(($h>>=8)+=$f+(~$g&$t))for@a[128..$#a]}
print+x"C*",@a}';s/x/pack+/g;eval
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