SUMMARY: Urgent: Can I install boot blook from Solaris 2.5/2.6 to 2.4 system?

From: Lincoln Chang (
Date: Fri Apr 16 1999 - 17:22:15 CDT

Hi Sun system managers,

Thanks to Chin Fang, Mark Ashley, Casper Dik, Kelvin White, and Devendra Murmu.

The original question:

> I only have ONE Solaris 2.4 system which is an important data server, and I
> have many Solaris 2.5 and 2.6 systems. Since the Solaris 2.4 is a 1GB system
> disk with around 8 disks (RAID 5 disksuite 4.0), I want to replaced it with
> a 2GB disk then do the upgrade from Solaris 2.4 to 2.6. I have already
> transfer everything from the 1GB system disk to 2GB disk except the boot blook,
> then the 1GB system disk got burned, at least I can smell it :(, by touching
> something with the IC/pin of one side of the disk !!!
> My question is can I connect the good 2GB disk (ie, has Solaris 2.4 in it
> except boot block) with one of my Solaris 2.5 (or 2.6) system , then install
> the Solaris 2.5/2.6 bootblock and it still work and boot up the Solaris 2.4
> system??

Casper sadi "The Solrais 2.5 and later bootblocks are not compatible with 2.4"
but Kelvin said "yes! installboot is ok to do this way!". Well, I didn't
dare to try to install a Solaris 2.5 bootblock to a 2.4 system, and here is
the answer:

Since the 2GB disk already has the bootblock in /usr/lib/fs/ufs, I should
boot Solaris 2.5 CDROM, mount the 2GB disk (contains 2.4 system but without
bootblock) to /tmp/mnt and then:

/usr/sbin/installboot /tmp/mnt/usr/lib/fs/ufs/bootblk /dev/rdsk/c0t3d0s0

I haven't really tried the above because I was so urgent on that Sunday evening,
I just simply installed Solaris 2.4 into the other system (this system has
SunOS OS installed before), and mount the 2GB disk as a second disk, and
install the bootblock.


Lincoln Chang
Systems Administrator
Philips Semiconductors

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