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High %wa , but iotop shows low disk usage
im running rsync with --bwlimit 10000 and i have around 20% "%wa" value when doing "top" linux command.
But when im monitoring io by "iotop" i see average read rate 150Kb/s and writing around 2Mb/s. Rarelly its writing 20Mb and i seen even 40Mb (rare)
Im curious why there is %wa value so high when disk full writing/reading speed is used from around 20% only according to iotop?
disk is: TOSHIBA DT01ACA200 2TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Bare Drive - Newegg.com
smartctl -a /dev/sda is without errors.
- Join Date
- Apr 2009
- I can be found either 40 miles west of Chicago, in Chicago, or in a galaxy far, far away.
What file system are you using? Are you writing a lot of little files? Are the source/sink files on different computers across the network? IE, you are not providing anywhere enough information about your system(s) to help much, other than guessing.Sometimes, real fast is almost as good as real time.
Just remember, Semper Gumbi - always be flexible!
thx, im writing some files, but im notsure if its too much. system is redhat centos 5.x 64, non raid, single drive