the kernel rdb does not support it, you need to use qemu.
On Mon, May 12, 2014 at 8:00 PM, lijian <blacker1981 at 163.com> wrote:
> Hi,
>
> I want to create a block image using the rbd cli and followng the rule:
> stripe-unit * stripe-count = 2^order,
> Take for example:
> rbd create --pool rbd --size 20480 --order 21 --image-format 2 --stripe-unit
> 1048576 --stripe-count 2 image1
>
> But when I try to map to a block device then raise a message: rbd: add
> failed: (22) Invalid argument
> check the linux kernel(Linux nodeclient 3.11.0-12-generic #19-Ubuntu SMP Wed
> Oct 9 16:20:46 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux) log
> dmesg | grep rbd
> rbd: image image1: unsupported stripe unit (got 1048576 want 2097152)
> I guess the rbd kernel does not support the 'fancy striping', after I read
> the kernel code rbd.c
> ----------------------------------------------------------------------------------------------------------------------
> if (stripe_unit != obj_size) {
> rbd_warn(rbd_dev, "unsupported stripe unit "
> "(got %llu want %llu)",
> stripe_unit, obj_size);
> return -EINVAL;
> }
> stripe_count = ceph_decode_64(&p);
> if (stripe_count != 1) {
> rbd_warn(rbd_dev, "unsupported stripe count "
> "(got %llu want 1)", stripe_count);
> return -EINVAL;
> }
> -----------------------------------------------------------------------------------------------------------------
>
> So how to enable/test the 'fancy striping' features, please help!
>
> Best Regards,
> Jian LI
>
>
>
>
> _______________________________________________
> ceph-users mailing list
> ceph-users at lists.ceph.com
> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
>
