On 2011-10-25, at 9:24 AM, chen guihua wrote:
> I have¡¡configured lustre 1.6.5 FS, and in the client,i tried¡¡to
> create a VHD file in the shared directory , using command strace ¨Co logfile
> vhd-tuil create ¨Cn vhd.img ¨Cs 2048, and execute the command to test whether
> the lustre support the VHD-format file or not?, I find some information as
> follows:(all command are excuted in client )
>
> 1 in the lustre share directory,logfile records:
> open("vhd.img", O_WRONLY|O_CREAT|O_TRUNC|O_DIRECT, 0644) = 3
> lseek(3, 0, SEEK_SET) = 0
> write(3, "conectix\0\0\0\2\0\1\0\0\0\0\0\0\0\0\2\0\0267\306\212tap\0"...,
> 512) = -1 EINVAL (Invalid argument)
The "sector size" for Lustre is 4096 bytes (actually PAGE_SIZE),
not 512 bytes. You are using O_DIRECT (which, by the way, is
_really_ slow with such small IO sizes), so the IO needs to be
sized and aligned at 4096-byte boundaries.
This will be true of newer "advanced format" disk drives as well,
so you need to update your code to use 4kB IOs, or better yet to
just use buffered IO.
Cheers, Andreas
--
Andreas Dilger
Principal Engineer
Whamcloud, Inc.
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