Can't create large vdevs

[eliphant0723]

Hi,

I created a 60G zpool on /dev/sdx1. When I try to create a 30G vdev, zfs says:

"cannot create 'pool1/vdev1': volume size exceeds limit for this system"

I finally was able to create a vdev of 2G. Any ideas?

Ubuntu 10.4, 2.6.32-24-generic, /dev/sdx1 is unpartitioned space.

[eliphant0723]

I think I just figured it out:

http://www.mail-archive.com/zfs-discuss@opensolaris.org/msg12491.html

I forgot to mention I'm running x86 atm

[behlendorf]

By default the size of a zvol is limited to 2GB on 32-bit systems. This is just the way it works on Solaris so for now I kept the same behavior on Linux. That being said I'm not 100% positive this limitation can't be relaxed on a Linux system. I've never tried to see what will happen exactly. If you would like to try the experiment simply comment out the "#ifdef _ILP32" bit in zvol_check_volsize() as follows, then rebuild the source and see what happens (test data only please). I'd love to hear about your results.

/*
 * Sanity check volume size.
 */
int
zvol_check_volsize(uint64_t volsize, uint64_t blocksize)
{
        if (volsize == 0)
                return (EINVAL);

        if (volsize % blocksize != 0)
                return (EINVAL);

// #ifdef _ILP32
//        if (volsize - 1 > MAXOFFSET_T)
//                return (EOVERFLOW);
// #endif
        return (0);
}