The dump is now copied to tape in pax format instead of tar, because pax supports large (greater than 2 GB) files.
The dumpcheck facility runs by default each day at 3:00 p.m. local time. See the root crontab file to change the time that dumpcheck runs. The dumpcheck facility ensures that there is enough space in the dump device and copy directory to receive the system dump. If dump compression will facilitate a system dump, it will be enabled unless you have manually turned it off. The results of dumpcheck are in the system error log.
New Flags for the Snap Command
The -H and -C flags have been added to the snap command.
-H flag gathers system information without any checkstop/scanout data.
-C flag gathers checkstop/scanout files.
Firmware Limitation
The firmware in many of the PCI bus-based RS/6000 machines is limited in regard to the region of the hard disk from which it can read a boot image. This problem will not be encountered under most circumstances. The symptom of the problem is a failure to boot from hard disk, resulting in a message from firmware similar to unrecognized Client Program format.
The affected machines can be identified most easily as the machines that provide access to the firmware System Management Services by means of pressing the F1 keys on the system-attached keyboard or the 1 key on a TTY keyboard.
The problem is that the firmware on the affected machines cannot read the boot image from the hard disk if any part of the boot image resides past the 4-gigabyte boundary on the hard disk. This is not a problem for most customers because the AIX installation process creates the boot logical volume at the beginning of the disk. This is achieved by using the -a flag with the mklv command and specifying e (which corresponds to edge) as the parameter for the -a flag. Using the mklv command with this parameter results in the boot logical volume being created at the edge of the hard disk, and the resulting address that the firmware uses to read the boot image will be within a safe range. The AIX installation process has always created the boot logical volume near the edge of the hard disk because that region of the hard disk has the slowest access time, and this allows other regions of the hard disk to be used by file systems that can benefit from the better performance.
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