Date: Tue, 15 Feb 2000 22:18:10 +0800 From: Peter Wemm <peter@netplex.com.au> To: Joe Greco <jgreco@ns.sol.net> Cc: hackers@freebsd.org Subject: Re: Filesystem size limit? Message-ID: <20000215141810.AACBC1CD9@overcee.netplex.com.au> In-Reply-To: Message from Joe Greco <jgreco@ns.sol.net> of "Tue, 15 Feb 2000 03:40:58 CST." <200002150940.DAA27212@aurora.sol.net>
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Joe Greco wrote:
> So I wanted to vinum my new 1.9TB of disks together just for chuckles, and
> it went OK up to the newfs..
>
> S play.p0.s0 State: up PO: 0 B Size: 46 GB
> S play.p0.s1 State: up PO: 32 MB Size: 46 GB
[..]
> S play.p0.s35 State: up PO: 1120 MB Size: 46 GB
> S play.p0.s36 State: up PO: 1152 MB Size: 46 GB
> S play.p0.s37 State: up PO: 1184 MB Size: 46 GB
> vinum ->
> Suspended
> # newfs -v /dev/vinum/rplay
> preposterous size -584318976
>
> Bleah. :-(
>
> Just thought I'd mention it. I'm putting the machine into production,
> with the smaller filesystems that I originally intended, but it seemed
> noteworthy to pass this along. Dunno how many terabyte filesystem folks
> are out there.
/usr/include/sys/disklabel.h:
u_int32_t p_size; /* number of sectors in partition */
newfs.c:
int fssize; /* file system size */
..
havelabel:
if (fssize == 0)
fssize = pp->p_size;
ie: there is a signed 32 bit sector count limit. 2^31 == 1TB. It shouldn't
be too hard to get it to create 2^32 bit (2TB) filesystem though. I'd expect
there to be more problems that this to bite you though. :-(
2^31 also happens to be the mmap() file offset limit FWIW.
BTW; what on earth is going on this beastie? Is this raid5 or stripe/concat?
(And I'd hate to be waiting for a fsck :-)
Cheers,
-Peter
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