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Operating Systems
Solaris
Lost Root Password on VXVM Encapsulated Root Disk
Post 302604586 by sunnyd76 on Tuesday 6th of March 2012 06:49:03 AM
03-06-2012
Lost Root Password on VXVM Encapsulated Root Disk
Hi All
Hope it's okay to post on this sub-forum, couldn't find a better place
I've got a 480R running solaris 8 with veritas volume manager managing all filesystems, including an encapsulated root disk (I believe the root disk is encapsulated as one of the root mirror disks has an entry under /etc/vx/reconfig.d/disk.d/c1t0d0). The root password has been lost and I need to reset it. I've found what looks like a decent document online that suggests that I need to unencapsulate the root disk prior to changing the shadow entry. Seems risky work for a simple change - i'm hoping there may be a shortcut but heyho otherwise... I'm probably being over cautious
As the disk is encapsulated, can I just remove one of the disks while the system is live (effectively splitting the mirror), then boot from CD, mount the root FS, edit the shadow directly, boot again and just replace the removed disk? Any idea if the FS would be marked as 'dirty' by vxvm if I did this and not be bootable?
Assuming my finger in the air solution above won't work. Any idea if the document will be okay to run with?
Thanks!
Sunny
Hope it's okay to post on this sub-forum, couldn't find a better place
I've got a 480R running solaris 8 with veritas volume manager managing all filesystems, including an encapsulated root disk (I believe the root disk is encapsulated as one of the root mirror disks has an entry under /etc/vx/reconfig.d/disk.d/c1t0d0). The root password has been lost and I need to reset it. I've found what looks like a decent document online that suggests that I need to unencapsulate the root disk prior to changing the shadow entry. Seems risky work for a simple change - i'm hoping there may be a shortcut but heyho otherwise... I'm probably being over cautious
As the disk is encapsulated, can I just remove one of the disks while the system is live (effectively splitting the mirror), then boot from CD, mount the root FS, edit the shadow directly, boot again and just replace the removed disk? Any idea if the FS would be marked as 'dirty' by vxvm if I did this and not be bootable?
Assuming my finger in the air solution above won't work. Any idea if the document will be okay to run with?
Thanks!
Sunny
Last edited by methyl; 03-06-2012 at 12:31 PM..
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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)