Is it possible to use iostat (or some other tool) to get the number of reads/writes operation "since the last server reboot"?
I mean: I'd need to know how many reads/writes the server has done since the last boot, not in realtime.
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For the amount of data, see
[root@example ~]# iostat -m Linux 2.6.32-431.11.2.el6.x86_64 (example.com) 08/08/2014 _x86_64_ (2 CPU) avg-cpu: %user %nice %system %iowait %steal %idle 0.38 0.00 4.10 0.36 0.10 95.07 Device: tps MB_read/s MB_wrtn/s MB_read MB_wrtn sda 0.95 0.01 0.01 68451 77290 vda 13.95 0.26 0.33 2871276 3572093 dm-0 1.93 0.01 0.01 64657 73426 dm-1 14.39 0.26 0.33 2871274 3572093
-m will display the output in MiB (instead of blocks), and the
MB_wrtn are the numbers you are looking for.
For the total amount of I/O operations (requests), see
/proc/diskstats, which can be interpreted as follows (this is from the kernel doc tree):
What: /proc/diskstats Date: February 2008 Contact: Jerome Marchand <email@example.com> Description: The /proc/diskstats file displays the I/O statistics of block devices. Each line contains the following 14 fields: 1 - major number 2 - minor mumber 3 - device name 4 - reads completed successfully 5 - reads merged 6 - sectors read 7 - time spent reading (ms) 8 - writes completed 9 - writes merged 10 - sectors written 11 - time spent writing (ms) 12 - I/Os currently in progress 13 - time spent doing I/Os (ms) 14 - weighted time spent doing I/Os (ms) For more details refer to Documentation/iostats.txt