Re: fio test triggering bad data on ext4

Eric Sandeen
2010-06-18T14:02:34Z

Jens Axboe wrote:
> Hi,
>
> I was writing a small fio job file to do writes and read verifies on a
> device. It forks 32 processes, each writing randomly to 4 files with a
> block size between 4k and 16k. When it has written 1024 of those blocks,
> it'll verify the oldest 512 of them. Each block is checksummed for every
> 512b. It uses libaio and O_DIRECT.
>
> It works on ext2 and btrfs. I haven't run it to completion yet, but they
> survive 15-20 minutes just fine. ext4 doesn't even go a full minutes
> before this triggers:

Jens, can you try XFS too? Since ext3 can't do direct IO to a hole,
(and I'm not sure about btrfs in that regard), ext4 may be most similar
to xfs's behavior on the test ... wondering how it fares.

Thanks,
-Eric