Hello!
Can you help me with iostat monitoring of /dev/dm-* and /dev/sd*
devices. Main question is about understanding of tps value. For example
/dev/dm-5 is a dm-mapper-device based on /dev/sde and /dev/sdc. tps
value of dm-5 is 30% bigger than sde+sdf. According to stats from
storage, right TPS io value is sde+sdf. Why /dev/dm* values differ while
other columns are the same? How to treat this numbers?
Thank you!
avg-cpu: %user %nice %system %iowait %steal %idle
0.16 0.00 0.08 0.02 0.00 99.73
Device: tps MB_read/s MB_wrtn/s MB_read MB_wrtn
sda 0.50 0.00 0.01 0 0
sda1 0.00 0.00 0.00 0 0
sda2 0.50 0.00 0.01 0 0
sdb 0.00 0.00 0.00 0 0
sdb1 0.00 0.00 0.00 0 0
sdc 0.43 0.00 0.01 0 0
sdc1 0.00 0.00 0.00 0 0
sdc2 0.43 0.00 0.01 0 0
sdd 0.00 0.00 0.00 0 0
sdd1 0.00 0.00 0.00 0 0
sde 38.00 0.00 0.25 0 7
sde1 38.00 0.00 0.25 0 7
sdf 38.50 0.00 0.25 0 7
sdf1 38.50 0.00 0.25 0 7
dm-0 3.70 0.00 0.01 0 0
dm-1 0.00 0.00 0.00 0 0
dm-2 3.70 0.00 0.01 0 0
dm-3 3.70 0.00 0.01 0 0
dm-4 0.00 0.00 0.00 0 0
dm-5 126.43 0.00 0.49 0 14
dm-6 126.43 0.00 0.49 0 14
dm-7 0.00 0.00 0.00 0 0
dm-8 0.00 0.00 0.00 0 0
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