Hi, I started using fio recently for raw disk performance testing. I noticed at times that while I am running the attached test file on /dev/sdb, which is a raid 6 volume, there is lot of activity on the boot disk /dev/sda too. Here's excerpt from iostat output : Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util sda 0.00 7300.20 0.00 73.60 0.00 27.16 755.76 143.93 1950.19 13.59 100.02 sdb 0.00 0.00 0.00 210.00 0.00 0.82 8.00 10.41 49.34 4.76 100.02 I'll appreciate any insight into what can be causing these kind of accesses on the boot drive? Can these accesses affect overall performance results on the actual test drive? Thanks, Vikram. PS: I am using fio version 1.50
[global] description=Standard Performance test runtime=120 direct=1 filename=/dev/sdb numjobs=20 group_reporting [seqread_4] rw=read bs=4k [seqread_8] stonewall rw=read bs=8k [seqread_16] stonewall rw=read bs=16k [seqread_32] stonewall rw=read bs=32k [seqread_64] stonewall rw=read bs=64k [seqread_128] stonewall rw=read bs=128k [seqread_256] stonewall rw=read bs=256k [seqwrite_4] stonewall rw=write bs=4k [seqwrite_8] stonewall rw=write bs=8k [seqwrite_16] stonewall rw=write bs=16k [seqwrite_32] stonewall rw=write bs=32k [seqwrite_64] stonewall rw=write bs=64k [seqwrite_128] stonewall rw=write bs=128k [seqwrite_256] stonewall rw=write bs=256k [randread_4] stonewall rw=randread bs=4k [randread_8] stonewall rw=randread bs=8k [randread_16] stonewall rw=randread bs=16k [randread_32] stonewall rw=randread bs=32k [randread_64] stonewall rw=randread bs=64k [randread_128] stonewall rw=randread bs=128k [randread_256] stonewall rw=randread bs=256k [randwrite_4] stonewall rw=randwrite bs=4k [randwrite_8] stonewall rw=randwrite bs=8k [randwrite_16] stonewall rw=randwrite bs=16k [randwrite_32] stonewall rw=randwrite bs=32k [randwrite_64] stonewall rw=randwrite bs=64k [randwrite_128] stonewall rw=randwrite bs=128k [randwrite_256] stonewall rw=randwrite bs=256k
