There is lot of difference between iostat and iostat 1 command output. Please explan.



iostat

Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn
sda 108.00 127.63 3366.83 4850617758 127956159764
dm-0 0.74 1.27 5.61 48384474 213345688
sdb 0.00 0.00 0.00 70344 0
dm-1 32.67 20.73 259.22 787707506 9851483976
dm-2 381.95 97.75 3045.46 3714830882 115742394968
dm-3 3.90 7.88 30.78 299617250 1169699640
dm-4 3.08 0.00 24.64 24898 936262648
dm-5 0.14 0.00 1.13 19930 42972592



iostat 1


Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn
sda 12.00 0.00 176.00 0 176
dm-0 0.00 0.00 0.00 0 0
sdb 0.00 0.00 0.00 0 0
dm-1 4.00 0.00 32.00 0 32
dm-2 18.00 0.00 144.00 0 144
dm-3 0.00 0.00 0.00 0 0
dm-4 0.00 0.00 0.00 0 0
dm-5 0.00 0.00 0.00 0 0

Try reading the second paragraph.

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Thanks for the reply.
TPS in IOSTAT output is similar to IOPS (IO per second).