On Fri, Aug 15, 2014 at 01:58:09PM -0400, Waiman Long wrote: > On 08/14/2014 11:34 PM, Dave Chinner wrote: > > > ><create sparse vm image file of 500TB on ssd with XFS on it> > >xfs_io -f -c "truncate 500t" -c "extsize 1m" /path/to/vm/image/file .... > > Thank for the testing recipe. I am afraid that I can't find a 500TB > SSD for testing purpose.
Which bit of "sparse vm image file" didn't you understand? I'm using a 400GB of SSD for this testing.... $ df -h /mnt/fast-ssd Filesystem Size Used Avail Use% Mounted on /dev/sdf 400G 275G 125G 69% /mnt/fast-ssd $ ls -lh /mnt/fast-ssd/vm-500t.img -rw------- 1 root root 500T Aug 15 13:21 /mnt/fast-ssd/vm-500t.img $ du -sh /mnt/fast-ssd/vm-500t.img 275G /mnt/fast-ssd/vm-500t.img That is on a Samsung 840 EVO SSD, which just about everyone should be able to obtain. Do you *really* think I have 500TB of SSDs lying around? Cheers, Dave. -- Dave Chinner da...@fromorbit.com -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/