Hi, I'm trying to setup a job file that tests interleaved data, so in theory writing 256K blocks with a gap of 256K in between, the end results is that I would like to write extra data into the gaps and make sure it is not corrupting neighbouring areas. But I'm having a problem with the first part. Here is the jobfile:- [global] ioengine=libaio direct=1 filename=/dev/sdb verify=meta verify_backlog=1 verify_dump=1 verify_fatal=1 stonewall [Job 2] name=SeqWrite256K description=Sequential Write with 1M Bands (256K) rw=write:1M bs=256K do_verify=0 verify_pattern=0x33333333 size=1G [Job 4] name=SeqVerify256K description=Sequential Read/Verify from Sequential Write (256K) rw=read:1M bs=256K do_verify=1 verify_pattern=0x33333333 size=1G There seems to be a bug (or maybe by design) when using the 'size=' variable. It seems to count the gaps (1M) within the size of 1G, but only on the write, the reads seems to report the IO transferred as 1G Here is the status of the runs:- Run status group 0 (all jobs): WRITE: io=209920KB, aggrb=34039KB/s, minb=34039KB/s, maxb=34039KB/s, mint=6167msec, maxt=6167msec Run status group 1 (all jobs): READ: io=1025.0MB, aggrb=36759KB/s, minb=36759KB/s, maxb=36759KB/s, mint=28553msec, maxt=28553msec And you can see the Write IO is a lot lower than the Read IO, even though I have asked it to cover the same disk space. It could be that this is by design and it is my jobfile that is not setup correctly, has anybody tried something like this before? Thanks, Gavin Martin -- ------------------------------ For additional information including the registered office and the treatment of Xyratex confidential information please visit www.xyratex.com ------------------------------ -- 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
