Monitor Filesystem IO Calls for Messaging Server (Doc ID 1351483.1)

Last updated on FEBRUARY 14, 2024

Applies to:

Purpose

Email is an I/O-intensive application. It is not just the throughput in terms of the amount of data -- because the IO operations tend to be relatively small (in terms of what modern IO systems are capable of) -- but the rate of operations (also called IOPS -- IO Operations Per Second). Therefore most email performance problems tend to be due to disk I/O bottlenecks.

There are tools to monitor disk I/O performance (such as the asvc_t column in iostat -xpn), but sometimes the bottleneck is in the filesystem rather than the lower level storage devices.

This article provides a DTrace script to monitor a few of the disk-IO-related syscalls used by some of the Messaging Server processes. This should be a basis for deciding whether your problem is related to the file system or disks storage or something else.

Also refer to:

• Using the DBhang Script to Gather Debug Data about Messaging Server (Doc ID 1126356.1)
• GUDS - A Script for Gathering Solaris Performance Data (Doc ID 1285485.1)
• How to Upload Data to Oracle Such as Explorer and Core Files (Doc ID 1020199.1)

Troubleshooting Steps

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