Re: Re-2: verify seems not to take place on iSCSI-Target writing

[Jens Axboe <axboe@kernel.dk>]

On 2012-03-02 18:06, Stefan Hübner wrote:
> Dear Jens,
> 
> this is the output.  I added some supplementary details in the hope it's useful ...
> 
> UltraBitch ~ # ISCSI_DEVICE=/dev/sdb SECONDS=$((20*3600)) fio iscsi-stress.fio 
> iSCSI: (g=0): rw=randwrite, bs=4K-4M/4K-4M, ioengine=libaio, iodepth=16
> fio 2.0.3
> Starting 1 process
> Jobs: 1 (f=1): [w] [17.3% done] [0K/113.2M /s] [0 /71  iops] [eta 03d:23h:28m:21s]
> iSCSI: (groupid=0, jobs=1): err= 0: pid=18184
>   write: io=7740.2GB, bw=112723KB/s, iops=63 , runt=72000222msec
>     bw (KB/s)  : min= 3669, max=593424, per=100.00%, avg=113561.25, stdev=26868.27
>   cpu          : usr=4.18%, sys=1.28%, ctx=4760480, majf=0, minf=106912
>   IO depths    : 1=0.1%, 2=0.1%, 4=0.1%, 8=0.1%, 16=100.0%, 32=0.0%, >=64=0.0%
>      submit    : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
>      complete  : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.1%, 32=0.0%, 64=0.0%, >=64=0.0%
>      issued    : total=r=0/w=4560578/d=0, short=r=0/w=0/d=0
> 
> Run status group 0 (all jobs):
>   WRITE: io=7740.2GB, aggrb=112723KB/s, minb=115428KB/s, maxb=115428KB/s, mint=72000222msec, maxt=72000222msec

No reads happened - quick guess, you had the timeout hit before the
write phase has finished. Hence it'll exit, and don't do verifies.

The reads you saw in the stats must be from other processes. Fio didn't
do any.

-- 
Jens Axboe