Updated sysstat packages that fix several bugs and add various enhancements are now available for Red Hat Enterprise Linux 6.
The sysstat packages provide a set of utilities which enable system monitoring of disks, network, and other I/O activity.
- Previously, the sysstat package did not support dynamically attributed major device numbers. Consequently, devices with these numbers were not listed in sar reports under their real names. With this update, support for dynamically attributed major device numbers has been added to sysstat. As a result, all devices now appear with their correct names in sar reports.
- A previous sysstat update changed binary data files in a backward incompatible way, but the version number of these binary data files remained the same. Consequently, using a later sysstat version to read binary data files created by an earlier version of sysstat could have produced invalid results. The version number of sysstat binary data files has been updated, thus fixing this bug. As a result, the current sysstat version will not read binary data files created by previous versions. For more information, please refer to the description of the "--legacy" option in the sar(1) manual page.
- Prior to this update, the umask command was executed too late in the sa1 script. Under certain circumstances, this could have caused incorrect file permissions of newly created files. With this update, executing umask has been moved to the appropriate place in the sa1 script. As a result, newly created files have correct permissions.
- Kernel device names, such as sda or sdb, might point at different devices every boot. To prevent possible confusion, support for persistent device names has been added to the iostat and sar programs. Persistent names can be enabled with the new "-j" command-line option for both iostat and sar.
- The sysstat package has been modified to store the collected statistics longer. The original period of 7 days has been extended to 28 days, thus allowing for better analysis of more complex performance issues.
- With this update, a new "-y" option has been added to the iostat program. This option allows to skip first "since boot" statistics in the report, so there is no longer need to post-process the iostat output in this matter.
Users of sysstat are advised to upgrade to these updated packages, which fix these bugs and add these enhancements.