disk usage issue 100%

When I run this command : iostat -x 5 I'm getting : (..) avg-cpu: %user %nice %system %iowait %steal %idle 22.12 16.85 1.20 28.71 0.00 31.12 Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util sda 37.80 4.20 1285.20 1.00 10584.00 30.40 8.25 48.84 34.94 0.78 100.00 sda1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 sda2 37.80 4.20 1285.20 1.00 10584.00 30.40 8.25 48.84 34.94 0.78 100.00 sdb 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 sdb1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 sdc 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 sdc1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 sdd 0.20 0.00 52.40 3.00 1409.60 56.00 26.45 0.34 6.14 3.79 21.00 sdd1 0.00 0.00 32.60 1.80 1036.80 28.80 30.98 0.20 5.89 5.10 17.56 sdd2 0.20 0.00 19.80 1.20 372.80 27.20 19.05 0.14 6.56 4.30 9.02 sdd3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 dm-0 0.00 0.00 0.00 5.20 0.00 41.60 8.00 7.16 1049.27 192.31 100.00 dm-1 0.00 0.00 1323.80 0.00 10590.40 0.00 8.00 50.75 35.33 0.76 100.00 My concern is on the lines reporting 100% The device listed on top ( sda2 ), is not mounted as a directory (so, it's not "used" by processes). How come it's mentioned as 100% usage ? Is it a problem ? What about "dm-0" ? Same issue ? Hi there.

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