Re: fio: first direct io errored

[Jens Axboe <axboe@kernel.dk>]

On 2012-04-19 15:56, bin lin wrote:
> Hi, i am a newer with fio. i have written a read_iolog and use fio to
> run the trace in a
> 
> device /dev/sdb1, but it had errors when add --direct=1. the errors is
> as follows:
> 
> replay: (g=0): rw=read, bs=4K-4K/4K-4K, ioengine=sync, iodepth=1
> fio 2.0.6
> Starting 1 process
> fio: first direct IO errored. File system may not support direct IO,
> or iomem_align= is bad.
> fio: pid=6363, err=22/file:engines/sync.c:62, func=xfer, error=Invalid argument
> 
> the trace file is as follows:
> fio version 2 iolog
> /dev/sdb1 add
> /dev/sdb1 open
> /dev/sdb1 read 27267456 8
> /dev/sdb1 read 27267560 8
> /dev/sdb1 read 34933120 8
> /dev/sdb1 read 34933128 8
> /dev/sdb1 read 34933136 8
> /dev/sdb1 read 34933144 8
> /dev/sdb1 read 34604888 8
> /dev/sdb1 close
> 
> The filesystem on /dev/sdb1 is ext3 which supports the O_DIRECT, and
> the trace file use
> 
> block size as 512 byte. I do not know where the error is and how to
> solve it ? thanks

What job generated that iolog? The reason is fails is that the transfer
size is 8 _bytes_, it's not sectors. So the above wont work on any
device.

-- 
Jens Axboe