On 7/25/07, John Glowacki <johng at idttechnology.com> wrote:
Peter Welter wrote:
One of the things I'd like to see in 4.3.0 is what is already partly available on Sun-boxes in 4.2.0, the [iostatdisk] part. The stats are gathered but not plotted. I hope this monitor will make it, on all platforms, because you can pinpoint any disk performance problems much easier.
Thanks, Peter
That would be good to have. I have been asked if hobbit does this from other groups in the company.
Tracking disk IO gets complicated pretty quickly for a few reasons:
- OS's don't have common commands for measuring disk performance
- Do you watch IO by filesystem or spindle? If you have RAID, grabbing the data can become even more difficult.
- People can disagree on what good disk IO means, and even fewer understand disk IO workloads.
- I have no idea if Windows and the WMI has this kind of info.
For *ix, the "blocked processes" of vmstat is an excellent way to see if the server overall is IO bound. I would definitely like to see that a "stock" displayed metric in 4.3.0. Most *ix vmstat provides that number. Similar to the iostat for Solaris, the info is collected, just not displayed.
Scott Walters -PacketPusher