Messages in this thread | | | Date | Thu, 16 Sep 1999 02:33:44 -0400 | From | Clem Taylor <> | Subject | Re: ext2 file sizes |
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"Richard B. Johnson" wrote: > On Wed, 15 Sep 1999, Blankenship, Keith wrote: > > I am having some difficulty with the ext2 file systems. I need to generate a > > file that will be > 5 Gigabytes, and there appears to be a file size cap at > > approximately 2 Gig. I am running what appears to be a version 2.0.36 > > Kernel. Is there anything I can adjust, or do to increase the maximum file > > size? Or is there a newer kernel that may work? > > Note that on a 32-bit machine, toff_t, used as fpos_t, for file offsets, > i.e., lseek, is unsigned 32 bits. You will not be able to access such a > file on a 32-bit machine. There has been some work on changing this > to 'long long' (__kernel_loff_t, in ../asm/posix_types.h although you may > need a new 'C' runtime library to take advantage of this. > > What on earth are you doing with a single _file_ of that size? If you > need a gob of storage for data acquisition, you might be better off > with a dedicated raw device. Since you access it in blocks, rather than > bytes, you won't have a size limitation for a few more years.
I work with compressed video and my average file size is 3-6 gigs, increasing all the time (higher bitrates). A while back I looked into using Linux for a video application and gave up and went with Solaris and Irix because of the lack of large file support. I was hoping that 2.4 would have large file support (and not just on 64 bit platforms), but that isn't looking promising based on comments here. Going to a 64 bit off_t (on 32 bit platforms) is a major change and will have a serious impact in user space. Just look at all the pain Solaris and Irix had in making the move.
--Clem
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