I am confused by this counter. It says I have a high percentage of IO stalls. What does this mean? It seems to me that this is the ratio of reads/writes in a database file compared to all the database files. For example my data file says 13% io stalls, my log file says 87% io stalls. This adds up to 100%.
How can I tell whether my workload is stressing the disk subsystem using this dmv and without using perfmon couters.