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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.


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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 ...


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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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