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Operating Systems Solaris vxvm root disk booting problem - solved with boot -a. How? Post 302399372 by csaunders on Saturday 27th of February 2010 03:26:26 PM
Old 02-27-2010
Quote:
Originally Posted by badoshi
Hi All,

We had a Sun Netra T1 go down the other day, the root disk was mirrored using vxvm. Upon boot from either disk, we had the following error appear:

Code:
    WARNING: Error writing ufs log state
    WARNING: ufs log for / changed state to Error
    WARNING: Please umount(1M) / and run fsck(1M)
    WARNING: Error writing master during ufs log roll
    WARNING: ufs log for / changed state to Error
    WARNING: Please umount(1M) / and run fsck(1M)
    Cannot mount root on /pseudo/vxio@0:0 fstype ufs
    panic[cpu0]/thread=140a000: vfs_mountroot: cannot mount root

no problems i thought. I'm well aware of this issue with VX. However I discovered I couldn't boot from vx root or mirror (same errors), we tried the cd, and the that failed too (suspected broken cdrom).

having given up all hope, I randomly tried a 'boot -a' (accepting all defaults) which somehow got me into multiuser, but with no vxvm partitions installed, or vx processes running. From there we were able to recover the system.

Can anyone shed any light as to how or why 'boot -a' worked? Not being a VX guy, I'm really scratching my head, and can't recreate this problem.

TIA.
are you sure it wasnt boot -as? as in single user... that would allow you to fsck the root disk...
 

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volrootmir(8)						      System Manager's Manual						     volrootmir(8)

NAME
volrootmir - Mirror areas necessary for booting to a new disk SYNOPSIS
/usr/sbin/volrootmir [-a] [nconfig=count] target_disk [swap=target_partition] OPTIONS
Specifies that all volumes on the system disk be mirrored, not just the root and swap volumes, rootvol and swapvol. DESCRIPTION
The volrootmir script causes a mirror copy of areas of the root disk involved in booting to be made on the specified target disk. When used without the -a option, volrootmir adds mirrors of the root and swap volumes and allocates them on the new disk. In addition, all disk regions required for booting are set up and partitions for the new volume mirrors are created. When used with the -a option, volrootmir mirrors all in-use partitions on the system disk. To mirror a swap volume that is on a separate disk from the root volume, the swap attribute must be used to specify a separate target for the swap mirror. The target disk(s) must be at least as large as the sum of the sizes of rootvol and swapvol. Also, the physical disk should not have any disk partition in use. This script can be called from the voldiskadm menus by choosing the Mirror volumes on a disk operation. ATTRIBUTES
Specifies the number of log copies and copies of the configuration database, for example, nconfig=2. Specifies that the swap volume, swapvol, be mirrored on a separate disk, as specified by target_partition. EXAMPLES
The following command mirrors the rootvol and swapvol volumes onto the target disk, dsk3. This command will fail if swapvol is on a differ- ent disk from rootvol. # volrootmir dsk3 The following command mirrors rootvol, swapvol, and any other volumes on the root disk onto the target disk, dsk3. This command will fail if swapvol is on a different disk from rootvol. # volrootmir -a dsk3 The following command mirrors rootvol on disk dsk3, swapvol onto partition dsk7d, and any other volumes on the root disk onto disk dsk3. This command will fail if swapvol is on the same disk as rootvol. # volrootmir -a dsk3 swap=dsk7d The following command mirrors rootvol onto disk dsk3 and swapvol onto partition dsk7d. This command will fail if swapvol is on the same disk as rootvol. # volrootmir dsk3 swap=dsk7d SEE ALSO
volintro(8), voldiskadm(8) volrootmir(8)
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