Coffin Michael C wrote:
Is there a way in z/Series Linux (we're running Debian, FWIW) to monitor disk I/O by userid and/or process? I'm looking for something like "top" but that includes disk I/O statistics for userids/processes. We are seeing a huge increase in disk I/O by our Linux virtual machine guests, but I don't know how to associate this I/O activity with "real" processes or userids to determine if they are legitimate or if there is a problem somewhere.
Issue is, that you cannot observe this directly due to the page cache indirection: the block layer does'nt _know_ who's causing disk I/O. On the other hand, you can observe it indirectly: a process that causes heavy disk I/O tends to be in device wait state frequently. You can observe the process state with top. Btw: iostat and vmstat can report the overall I/O rates
cheers, Carsten ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
