High disk load
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If a customer complains of slow disk performance, check the physical node that the customer is running the VPS on to determine whether this is indeed the case. Tools to determine disk I/O load are:
atop
Type atop -dl and this will list the disk load. It will also list the top devices creating disk I/O.
iostat
Type iostat -k -d -N 1 -z 100. This will view the I/O status each second for the next 100 seconds.