Looking into performance problems, in search of some ideas of what to look for. I believe the issue may be related to the type of DASD being used.
Scenario, dd command to generate a 1G file if=/dev/zero takes 15s on x86_64 platform. The same command takes 15m on the s390x platform. In my environment the command takes 16s. My environment leverages MOD-3 DASD while the environment in question has MOD-9 and MOD-27 devices. I know historically the MOD-9 is typically a slower device but I don't know much about the MOD-27. Is it truly possible that the performance of these devices is bad enough to see such a difference between MOD-3 and x86_64 v. MOD-9 and MOD-27? What else should / can I look at to determine the root cause of the performance issues? Thanks! Eric ---------------------------------------------------------------------- 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
