how to find the MAX IO a physical disk can support?my application id doing IO, i can find the io-disk (Blk_wrtn/s) by using linux commands.but how can i find what is max limit i can reach, i want to know if it can be further loaded.
how to find the MAX IO a physical disk can support
disk
Obiously using Unix tools is the easiest way to do it. You can measure the max operation by creating a test case and use appropriate tools to measure its perfomance. A good resource can be found here: LINUX - Test READ and WRITE speed of Storagesudo hdparm -tT /dev/sdXfor example as read test.And to measure write:dd if=/dev/random of=<some file on the hd> bs=8k count=10000; sync;# Hit CONTROL-C after 5 seconds to get results# 65994752 bytes (66 MB) copied, 21.8919 s, 3.0 MB/sflagNoteAs pointed out in the comments the dd command also measures the performance of the file system and even /dev/random. It does measure the write performance of an environment, that heavily depends on the hard disks performance, though.