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Transactions are single IO-commands (fetch block/write block) that are written to the RAW-disk (in your example dm-0). The linux-kernel tries to order those commands into a better sequence or tries to compress them into more efficient commands (like: get two blocks at once instead of get one block and get another block right after this one). These are the ...


Process accounting should help track down which process is loading down the system. In Centos the package name is psacct. Tecmint has an article on starting with process accounting.


Please also be aware that TPS value represents reads and writes, you can use -x switch for extended view where reads and writes are separated (r/s = read IOPS, w/s = write IOPS): Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util vda 0.07 24.65 0.30 18.95 30.65 330.22 18.74 ...

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