Hi Josh, Thanks for the response. Do you mean use 'norandommap' option ? If I disable random map then won't I lose coverage on random i/o testing? Vikram. On Wed, May 4, 2011 at 9:39 PM, Josh Aune <luken@xxxxxxxxx> wrote: > On Wednesday, May 4, 2011, Vikram Seth <seth.vik@xxxxxxxxx> wrote: >> 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. > > Check for files in /tmp. To not generate them, disable the random map. > > Josh > >> >> 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 >> > -- 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
