Did a mirror (RAID1) with Solaris 10 in x86. Everything OK. Now, I´m trying to make the second disk booteable, this is: from grub or in case of failure of disk1.

I edited /boot/grub/menu.lst:

#---------- ADDED BY BOOTADM - DO NOT EDIT ----------
title Solaris 10 9/10 s10x_u9wos_14a X86 
findroot (rootfs1,0,a)
kernel /platform/i86pc/multiboot
module /platform/i86pc/boot_archive
#---------------------END BOOTADM--------------------
#---------- ADDED BY BOOTADM - DO NOT EDIT ---------- 
title Solaris failsafe
findroot (rootfs1,0,a)
kernel /boot/multiboot -s
module /boot/amd64/x86.miniroot-safe
#---------------------END BOOTADM--------------------
#---------- ADDED BY BOOTADM - DO NOT EDIT ----------
title Solaris failsafe
findroot (rootfs1,0,a)
kernel /boot/multiboot kernel/unix -s
module /boot/x86.miniroot-safe
#---------------------END BOOTADM--------------------

#Make second disk booteable!!!!!!!
title alternate boot
findroot (rootfs1,1,a)
kernel /boot/multiboot kernel/unix -s
module /boot/x86.miniroot-safe

But is not working. In the BIOS, when I select "alternate boot" I get:

Error 15: 15 file not found

also, how to configure to GRUB to make the disk2 to boot in case of error in disk1?

Additionally, I did (but not related to GRUB): eeprom altbootpath=/devices/pci@0,0/pci108e,5352@1f,2/disk@1,0:a

Here is the output of some commands that may help you:

/sbin/biosdev
0x80 /pci@0,0/pci108e,5352@1f,2/disk@0,0
0x81 /pci@0,0/pci108e,5352@1f,2/disk@1,0


ls -l /dev/dsk/c1t?d0s0
lrwxrwxrwx   1 root     root          50 Jul  7 12:01 /dev/dsk/c1t0d0s0 -> ../../devices/pci@0,0/pci108e,5352@1f,2/disk@0,0:a
lrwxrwxrwx   1 root     root          50 Jul  7 12:01 /dev/dsk/c1t1d0s0 -> ../../devices/pci@0,0/pci108e,5352@1f,2/disk@1,0:a


more /boot/solaris/bootenv.rc
setprop ata-dma-enabled '1'
setprop atapi-cd-dma-enabled '0'
setprop ttyb-rts-dtr-off 'false'
setprop ttyb-ignore-cd 'true'
setprop ttya-rts-dtr-off 'false'
setprop ttya-ignore-cd 'true'
setprop ttyb-mode '9600,8,n,1,-'
setprop ttya-mode '9600,8,n,1,-'
setprop lba-access-ok '1'
setprop prealloc-chunk-size '0x2000'
setprop bootpath '/pci@0,0/pci108e,5352@1f,2/disk@0,0:a'
setprop keyboard-layout 'US-English'
setprop console 'text'
setprop altbootpath '/pci@0,0/pci108e,5352@1f,2/disk@1,0:a'



cat /etc/vfstab 
#device         device          mount           FS      fsck    mount   mount
#to mount       to fsck         point           type    pass    at boot options
#
fd      -       /dev/fd fd      -       no      -
/proc   -       /proc   proc    -       no      -
#/dev/dsk/c1t0d0s1      -       -       swap    -       no      -
/dev/md/dsk/d1  -       -       swap    -       no      -
/dev/md/dsk/d0  /dev/md/rdsk/d0 /       ufs     1       no      -
/devices        -       /devices        devfs   -       no      -
sharefs -       /etc/dfs/sharetab       sharefs -       no      -
ctfs    -       /system/contract        ctfs    -       no      -
objfs   -       /system/object  objfs   -       no      -
swap    -       /tmp    tmpfs   -       yes     -


df -h
Filesystem             size   used  avail capacity  Mounted on
/dev/md/dsk/d0         909G    11G   889G     2%    /
/devices                 0K     0K     0K     0%    /devices
ctfs                     0K     0K     0K     0%    /system/contract 
proc                     0K     0K     0K     0%    /proc
mnttab                   0K     0K     0K     0%    /etc/mnttab
swap                    14G   972K    14G     1%    /etc/svc/volatile
objfs                    0K     0K     0K     0%    /system/object
sharefs                  0K     0K     0K     0%    /etc/dfs/sharetab
/usr/lib/libc/libc_hwcap1.so.1
           909G    11G   889G     2%    /lib/libc.so.1
fd                       0K     0K     0K     0%    /dev/fd
swap                    14G    40K    14G     1%    /tmp
swap                    14G    28K    14G     1%    /var/run