Fixing Solaris hosts that boot to a grub> prompt

I applied the latest recommended patch bundle this week to two X4140 servers running Solaris 10. When I rebooted, I was greeted with a grub> prompt instead of the grub menu:


This wasn’t so good, and for some reason the stage1 / stage2 loaders weren’t installed correctly (or the zpool upgrade caused some issues). To fix this issue, I booted to single user mode by inserting a Solaris 10 update 8 CD and adding “console=ttya -s” to the end of the boot line. Once my box booted, I ran ‘zpool status’ to verify my pool was available:

$ zpool status

pool: rpool
state: ONLINE
scrub: none requested

rpool ONLINE 0 0 0
c1t0d0s0 ONLINE 0 0 0

errors: No known data errors

To re-install the grub stage1 and stage2 loaders, I ran installgrub (you can get the device to use from ‘zpool status’):

$ /sbin/installgrub /boot/grub/stage1 /boot/grub/stage2


stage1 written to partition 0 sector 0 (abs 16065)
stage2 written to partition 0, 272 sectors starting at 50 (abs 16115)

To ensure that the boot archive was up to date, I ran ‘bootadm update-archive’:

$ bootadm update-archive -f -R /a

Creating boot_archive for /a
updating /a/platform/i86pc/boot_archive

Once these changes were made, I init 6’ed the system and it booted successfully. I’ve created quite a grub cheat sheet over the years (this made recovery a snap), and will post it here once I get it cleaned up.

This article was posted by Matty on 2009-12-12 09:38:00 -0400 -0400