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SCSI Bus problem perhaps? &nbsp;Maybe the bus on the device or cable is defective?
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SCSI Bus problem perhaps?  Maybe the bus on the device or cable is defective?

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It looks as if the RHEL lpars were restarted &nbsp;on the 27th  wondering if there is any correlation on these events.<br />
And the AIX c2o on the 28th<br />
seribm3 messages:Dec 27 04:03:08 aspibm3 syslogd 1.4.1: restart.<br />
seribm2 messages:Dec 27 04:02:14 aspibm2 syslogd 1.4.1: restart.<br />
server messages:Dec 27 04:02:18 aspibm1 syslogd 1.4.1: restart.<br />
serv <br />
reboot &nbsp; &nbsp;~ &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Oct 28 08:55<br />
shutdown &nbsp;vty0 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Oct 28 08:54<br />
root &nbsp; &nbsp; &nbsp;vty0 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Oct 28 08:44 - down &nbsp; (00:09)<br />
root &nbsp; &nbsp; &nbsp;vty0 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Oct 28 08:40 - 08:44 &nbsp;(00:04)<br />
reboot &nbsp; &nbsp;~ &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Oct 28 08:39<br />
shutdown &nbsp;vty0 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Oct 28 08:38<br />
<br />
2D0B-720: Controller device bus configuration error.<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Error log information:<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Date: Thu Dec 31 12:15:54 EST 2009<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Sequence number: 54011<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Label: SAS_ERR2<br />

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It looks as if the RHEL lpars were restarted  on the 27th  wondering if there is any correlation on these events.
And the AIX c2o on the 28th
seribm3 messages:Dec 27 04:03:08 aspibm3 syslogd 1.4.1: restart.
seribm2 messages:Dec 27 04:02:14 aspibm2 syslogd 1.4.1: restart.
server messages:Dec 27 04:02:18 aspibm1 syslogd 1.4.1: restart.
serv 
reboot    ~                                   Oct 28 08:55
shutdown  vty0                                Oct 28 08:54
root      vty0                                Oct 28 08:44 - down   (00:09)
root      vty0                                Oct 28 08:40 - 08:44  (00:04)
reboot    ~                                   Oct 28 08:39
shutdown  vty0                                Oct 28 08:38

2D0B-720: Controller device bus configuration error.
           Error log information:
                 Date: Thu Dec 31 12:15:54 EST 2009
                 Sequence number: 54011
                 Label: SAS_ERR2


What Could Have Caused This Reboot?

A Linux distribution is an operating system made as a software collection based on the Linux kernel and, often, on a package management system and are available for a variety of systems. A typical Linux distribution comprises a Linux kernel, GNU tools and libraries, additional software, documentation, a window system (the most common being the X Window System), a window manager, and a desktop environment. Most Linux systems are open-source software made available both as compiled binaries and in source code form, allowing modifications to the original software. Over three hundred distributions are in active development, including commercially backed distributions (such as Fedora, openSUSE and Ubuntu) and community-driven distributions (such as Debian, Slackware, Gentoo and Arch Linux).

Linux Distributions

Unix is a multitasking, multi-user computer operating system originally developed in 1969 at Bell Labs. Today, it is a modern OS with many commercial flavors and licensees, including FreeBSD, Hewlett-Packard’s UX, IBM AIX and Apple Mac OS-X. Apart from its command-line interface, most UNIX variations support the standardized X Window System for GUIs, with the exception of the Mac OS, which uses a proprietary system.