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Full Discussion: AIX disk less with SAN
Operating Systems AIX AIX disk less with SAN Post 302180558 by dukessd on Monday 31st of March 2008 01:01:05 PM
Old 03-31-2008
The boot list is stored in the firmware, the firmware is just like the bios on a PC.
The process is just the same, you must tell the firmware where to look for the boot device.
In AIX you can use the bootlist command to display or update the bootlist in the system firmware.

You are correct, if the battery dies there may be a problem booting.

Just like going in to the bios on a pc to correct a boot list after the battery died, on an AIX machine you can use SMS to correct the boot list.

Typically most people have the rootvg on local, internal, disks and any datavg's on SAN disks. This way if the SAN fails, the machine is still bootable, even if it cannot do any work because the SAN is offline.

You will probably also find the internal disks are slightly faster than SAN disks, this is useful for fast access to the operating system files and paging space.

Without a lot more information about your system and SAN configuration and testing of your specific setup there is no way to tell which would be best for you.

If you only have a small amount of space on the internal disks or one fiber card I'd leave things as they are, but check to see if the system can boot from the SAN disks, just so you know what you'll need to do to recover the system if the internal boot disk fails.
 

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LEARN ABOUT HPUX

vxbootsetup

vxbootsetup(1M) 														   vxbootsetup(1M)

NAME

       vxbootsetup - set up system boot information on a Veritas Volume Manager disk

SYNOPSIS

       /etc/vx/bin/vxbootsetup [-g diskgroup] [medianame ... ]

DESCRIPTION

       The  vxbootsetup utility configures physical disks so that they can be used to boot the system. Before vxbootsetup is called to configure a
       disk, the required volumes, standvol, rootvol and swapvol (and optionally, dumpvol) must be created on the disk.  All of these volumes must
       be contiguous with only one subdisk.

       The -g option may be used to specify the boot disk group.

       If  no  medianame arguments are specified, all disks that contain usable mirrors of the root, swap, /usr and /var volumes are configured to
       be bootable.

       If medianame arguments are given, only the disks that are associated with the specified disk names are configured to be bootable.

       vxbootsetup requires that:

       o    The root volume must be named rootvol and must have a usage type of root.

       o    The swap volume must be named swapvol and must have a usage type of swap.

       o    The volumes containing /usr and /var (if any) must be named usr and var, respectively.

       See the chapter "Recovery from Boot Disk Failure" in the Veritas Volume Manager Troubleshooting Guide for detailed information on  how  the
       system boots and how VxVM impacts the system boot process.  The vxmirror, vxrootmir, and vxresize utilities call vxbootsetup automatically.
       If you use vxassist, or vxmake and vxplex to create mirrors of the root volume on a disk, you must run vxbootsetup explicitly to  make  the
       disk bootable.

ARGUMENTS

       medianame
	    Specifies the disk name (disk media name) of a VM disk that is to be configured as bootable.

SEE ALSO

       disksetup(1M),  edvtoc(1M),  vxassist(1M),  vxevac(1M),	vxinstall(1M),	vxintro(1M),  vxmake(1M),  vxmirror(1M), vxplex(1M), vxresize(1M),
       vxrootmir(1M)

       Veritas Volume Manager Troubleshooting Guide

VxVM 5.0.31.1							    24 Mar 2008 						   vxbootsetup(1M)
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