Re: strange RF_PROTECTED_SECTORS magic

[Jukka Salmi <j+nbsd%2009.salmi.ch@localhost>]

Hello,

theo borm --> netbsd-users (2009-06-18 15:05:42 +0200):
[...]
> As I understood it the raidframe reserves RF_PROTECTED_SECTORS at the  
> start of a raid volume. I would therefore expect that if I substract the  
> size of a raid volume (raid0d) from the size of its container (sd0a), to  
> get this same figure.
>
> If I do so, I get 1953525136-1953524992=144.
> As far as I know RF_PROTECTED_SECTORS=64
>
> This does not add up. Am I missing something obvious?

quoting the relevant [1]section from The NetBSD Guide:

    Why isn't sizeof(raid0d) == (sizeof(wd1a) - RF_PROTECTED_SECTORS)?
    Size of raid0d is based on the largest multiple of the stripe size
    used for a RAID set. [...]


HTH, Jukka

[1] http://www.netbsd.org/docs/guide/en/chap-rf.html#chap-rf-setup-kerneldump

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