I read from here that the below command gives me the amount of data that needs to be written to the disk.
grep ^Dirty /proc/meminfo
It particularly says Ever ask yourself "How much data would be lost if I pressed the reset button?"
I wanted to test the above command and so I did the following.
dd if=/dev/urandom of=sample.txt bs=1G count=1
Now, in another shell I ran the above command.
grep ^Dirty /proc/meminfo Dirty: 44 kB grep ^Dirty /proc/meminfo Dirty: 36 kB
However, if I do a file copy using
cp it reports,
grep Dirty /proc/meminfo Dirty: 387680 kB grep Dirty /proc/meminfo Dirty: 609172 kB
I see from this page what Dirty does.
Dirty — The total amount of memory, in kilobytes, waiting to be written back to the disk.
Why Dirty is not reporting any size in case of