Date: 19 Mar 2002 23:46:18 -0000 From: erik@www.smluc.org To: freebsd-stable@freebsd.org Subject: Re: Problems with large disk. (> 1 TB) Message-ID: <20020319234618.2665.qmail@www.smluc.org>
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"Joseph Gleason" <clash@tasam.com> said:
> I don't have a solution for you, but I am pretty sure I know the problem:
>
> calc 2^31*512 = 1TB.
>
> disklabel references everything using a unit of 512 byte sectors. That
> number of sectors I'm sure is stored as an unsigned int making 2^31-1 the
> max number of sectors. Aka, just under a TB is fine, one TB or over is bad.
>
> So the 32mb dos partition probably made it just under a TB.
>
hrm, this could be a fairly important issue in the near future. What if the
disk label info was given a word width? like say a 1byte field 'n' stashed
somewhere to tell the machine "hey, this is an 8*2^n bit fs/disk"? would
require a reworking of the fs driver and tools, but it should give a fair
amount of breathing room, and big bragging rights? (we can do
56539106072908298546665520023773392506479484700019806659891398441363832832
terabytes and don't consume unnecessary hdd space) as well as being
fairly efficient for small drives like on embedded devices? Sorry, had
to open my mouth so I can look like an idiot ;)
> Maybe someone else knows a solution for this problem.
mebbe multiple partitions on each disk, multiple disk slices inside of each
all raided together? :) or hack the utils and fs driver to do 64b stuff?
<snip>
-Erik <erik@smluc.org> [http://math.smsu.edu/~erik]
The opinions expressed by me are not necessarily opinions. In all probability,
they are random rambling, and to be ignored. Failure to ignore may result in
severe boredom or confusion. Shake well before opening. Keep Refrigerated.
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