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Replies:
4
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Last Post:
Sep 27, 2009 12:52 AM
by: jerry40
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Posts:
2
From:
US
Registered:
9/11/09
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How to restore the grub bootloader from live cd?
Posted:
Sep 11, 2009 2:36 PM
To: OpenSolaris » help
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I installed ubuntu on a second drive and it didn't detect opensolaris and overwrote the MBR on the first drive (that has opensolaris). I fixed ubuntu simple enough so it's now installed into the MBR on second drive. So if I choose the second drive in bios it boots fine. But I still can't get the mbr reinstalled into the MBR on first drive.
The method I see a lot of people mention is this:
pfexec zpool import -f rpool
mkdir /tmp/a
pfexec zfs set mountpoint=/tmp/a rpool/ROOT/opensolaris
pfexec /sbin/installgrub /tmp/a/boot/grub/stage1 /tmp/a/boot/grub/stage2 /dev/rdsk/c7t0d0s0
My problem is with the mountpoint. Doing a directory listing of /tmp/a shows it's blank. Other mounts like /export and /rpool are allready mounted. In an effort to get around this I tried using the stage1 and stage2 from the cd (/boot/grub/stage1 and stage2) but when I try to boot it just shows a blank screen.
This is with opensolaris 2009.08
Some hopefully useful information:
jack@opensolaris:~$ zpool status
pool: rpool
state: ONLINE
scrub: none requested
config:
NAME STATE READ WRITE CKSUM
rpool ONLINE 0 0 0
c7t0d0s0 ONLINE 0 0 0
errors: No known data errors
jack@opensolaris:~$ zfs list
NAME USED AVAIL REFER MOUNTPOINT
rpool 25.8G 431G 81.5K /rpool
rpool/ROOT 10.2G 431G 19K legacy
rpool/ROOT/opensolaris 6.30G 431G 6.13G /tmp/a
rpool/ROOT/opensolaris-1 654K 431G 6.07G /
rpool/ROOT/opensolaris-2 3.90G 431G 7.01G /
rpool/dump 6.00G 431G 6.00G -
rpool/export 3.61G 431G 21K /export
rpool/export/home 3.61G 431G 21K /export/home
rpool/export/home/sbadmin 3.61G 431G 3.61G /export/home/sbadmin
rpool/swap 6.00G 437G 101M -
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Posts:
16
From:
Registered:
3/3/07
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Re: How to restore the grub bootloader from live cd?
Posted:
Sep 12, 2009 12:02 AM
in response to: eddyt
To: OpenSolaris » help
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Hi.
installgrub has a parameter "-m" which says grub to install itself to MBR.
Also you can try to update a boot archive:
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pfexec touch /tmp/a/system
pfexec bootadm update-archive -R /tmp/a
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After the whole process I would execute next commands:
pfexec zfs set mountpoint=/ rpool/ROOT/opensolaris
pfexec umount /tmp/a
pfexec export rpool
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I have not any idea why mounting is not working in your case, it worked fine for me.
Besides, why are you trying to mount rpool/ROOT/opensolaris? It seems that you may want to mount /rpool/ROOT/opensolaris-2 as most late version?
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Posts:
2
From:
US
Registered:
9/11/09
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Re: How to restore the grub bootloader from live cd?
Posted:
Sep 14, 2009 8:30 AM
in response to: jerry40
To: OpenSolaris » help
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The -m option worked beautifully. I still used stage1 and stage2 from the live cd (/boot/grub/stage1 and stage2) and it worked just fine although I did run installgrub again once the machine was running just in case.
In regards to using opensolaris-2, I was just guessing since have three opensolaris mounts was confusing for me. Sure enough when it boots it uses opensolaris and not -1 or -2.
Thanks for your help.
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Posts:
116
From:
IT
Registered:
2/2/08
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Re: How to restore the grub bootloader from live cd?
Posted:
Sep 26, 2009 11:45 AM
in response to: eddyt
To: OpenSolaris » help
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hi there i tried many times to restore the grub,i did the job,grub is back but unfortunatly,is not working.There's one thing that i do not understand how can grub from the live cd read my old menu.lst,how can that happen????
Is there any good fellowers who can help me to restore my system???
Thanks a lot
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Posts:
16
From:
Registered:
3/3/07
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Re: How to restore the grub bootloader from live cd?
Posted:
Sep 27, 2009 12:52 AM
in response to: hazzino
To: OpenSolaris » help
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Hi.
>grub is back but unfortunatly,is not working
Can you explain what do you mean?
I see two possibilities (after you restart from your hard disk, not live CD):
If grub is not able to load menu.lst you need to create the one in "/rpool/boot/grub/"
If you see the grub menu but menu points do not work, you need to edit menu.lst to set "findroot" and "bootfs" to proper values.
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title Solaris Development snv_121 X86
findroot (pool_rpool,0,a)
bootfs rpool/ROOT/opensolaris
kernel$ /platform/i86pc/kernel/$ISADIR/unix -B $ZFS-BOOTFS,console=graphics
module$ /platform/i86pc/$ISADIR/boot_archive
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grub and menu.lst are not hard linked, You can update grub and left old menu.lst and vice versa, this is ok.
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