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Special Forums Hardware Filesystems, Disks and Memory Does vmstat -d give a count of actual physical writes/reads done to/from hard disk? Post 302315613 by jake24 on Wednesday 13th of May 2009 12:03:12 AM
Old 05-13-2009
I used to think that whatever blocks the block layer sends down to the device driver to write actually does get written, even if the 2 writes are for the same LBA. (By calling a sync between 2 writes to the same area on the disk). My doubt is that does monmitoring IO stats from iostat, vmstat, proc/diskstats or /sys/sda/stat, give a count of the num ber of blocks sent to the disk for write?
 

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