Recreated with fio 2.0.11-35-g8428, the version was checked out from https://github.com/axboe/fio. I read a little bit of the source code, it seems to me the randwrite option gets the LBA without specifying the IO size. With that said, for a bsrange option, it is likely one random IO can step onto another IO if they happen to be adjacent. For example, request A has LBA of 1024 and size 8K, request B has LBA 1016 and size 16K. Without checking the request size, request B can overwrite content of request A. Is that the right interpretation? Do I miss something? Thanks. On Mon, Jan 27, 2014 at 11:22 AM, Jens Axboe <axboe@xxxxxxxxx> wrote: > On Fri, Jan 24 2014, Wallence Lu wrote: >> Hi, >> >> I've hit a bug in using the combination of bsrange and verify. >> Basically I want to do a random write test with a variable block size, >> and then verify the content after the write. But for some reason, the >> verify phase fails consistently. >> >> Linux distribution: >> Ubuntu 12.04.2 LTS, Linux version 3.5.0-23-generic >> $ fio --version >> fio 1.59 >> >> Conf file: >> [global] >> thread=1 >> ioengine=libaio >> buffered=0 >> direct=1 >> runtime=5400 >> write_iolog=./w_iolog2 >> >> [rand-write] >> bsrange=512-32K >> filename=disk.raw >> iodepth=1280 >> size=256M >> verify=meta >> verify_pattern=0x33 >> rw=randwrite >> >> The output complains as the following: >> Jobs: 1 (f=1): [V] [50.5% done] [0K/0K/0K /s] [0 /0 /0 iops] [eta >> 01m:40s] verify: bad magic header 0, wanted acca at file >> /home/maohua/test-clone/softwareCache/qemu/iscsi_sdd2/disk.raw offset >> 1179648, length 0 >> fio: pid=6118, err=84/file:io_u.c:1477, func=io_u_queued_complete, >> error=Invalid or incomplete multibyte or wide character >> >> rand-write: (groupid=0, jobs=1): err=84 (file:io_u.c:1477, >> func=io_u_queued_complete, error=Invalid or incomplete multibyte or >> wide character): pid=6118: Fri Jan 24 17:40:16 201 > > Fio 1.59 is ancient. Please try and reproduce on a recent version and > report back what happens. > > -- > Jens Axboe > -- To unsubscribe from this list: send the line "unsubscribe fio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
