[linux-lvm] I'm confused

Steven Lembark lembark at wrkhors.com
Sun Dec 8 20:09:02 UTC 2002

-- Pantaleimon <pantaleimon at home.no>

> On Sunday 08 December 2002 12:25, David Corbin wrote:
> [snip]
>> Well, About 3 gig is other partions, and it appears to me that the other
>> 7G is lost to making the raid device and various overheads (though that
>> sure seems excessive).
> I think hardisk manufacturers use base 10, rather than base 2, when they
> speak  of "mega" and "giga", ie. mega = 1000K and not 1024K. That means
> that a 120G  hardisk is only 114.4G. Hence, 109.77G + about 3G = about
> 113G. Hmm, still  about 1.5G missing.

They also quote the size before laying down timing tracks
and bad block mappings -- along with the bad blocks. That
accounts for another 10%.

Drives look kind of like modern lumber: you have to ignore
the nominal size in your calculations and deal with finished
size in order to plan for anything -- or just accept that
10% "shrinkage" is a normal part of life.

Steven Lembark                               2930 W. Palmer
Workhorse Computing                       Chicago, IL 60647
                                            +1 800 762 1582

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