Re: installing bootblocks on a new drive

To: netbsd-users%netbsd.org@localhost
Subject: Re: installing bootblocks on a new drive
From: Petar Bogdanovic <petar%smokva.net@localhost>
Date: Mon, 23 Feb 2009 19:43:53 +0100

On Mon, Feb 23, 2009 at 03:53:20PM +0000, Milos Negovanovic wrote:
> On Mon, Feb 23, 2009 at 03:51:42PM +0100, Petar Bogdanovic wrote:
> > On Mon, Feb 23, 2009 at 03:42:58PM +0100, Petar Bogdanovic wrote:
> > > On Mon, Feb 23, 2009 at 11:50:21AM +0000, Milos Negovanovic wrote:
> > > > 
> > > > After replacing a failed drive in RAID1 array I am trying to install
> > > > bootblocks on a new disk via:
> > > > 
> > > > /usr/sbin/installboot -o timeout=5 -v /dev/rwd0a /usr/mdec/bootxx_ffsv2
                                                                          ^^^^^
ffsv2, right? Not ffsv1?


> > > > When I try to boot of the new drive all I get is a reboot? Any ideas?
> > > 
> > > Is there any bootcode in the mbr of wd0 (see `fdisk -B' & mbr(8))? If
> > > not, does the partition table of wd0 contain an active partition?
> > > 
> > > As far as I remember, the first 446 bytes of the mbr may be empty, if
> > > the mbr partition table contains an active partition and the BIOS is
> > > clever enough.
> > 
> > Some indicators..
> > 
> >    # fdisk /dev/wd0
> >    (...)
> >    Partition table:
> >    0: NetBSD (sysid 169)
> >        start 63, size 781422705 (381554 MB, Cyls 0-51681/95/63), Active
> >    (...)                                                         ^^^^^^
> > 
> >    # dd if=/dev/wd0d bs=1 count=446 2>/dev/null | hexdump -C
> >    00000000  31 c0 8e d0 bc 00 7c 8e  c0 8e d8 89 e6 bf 00 06  
> > |1.....|.........|
> >    00000010  b9 00 01 f3 a5 b9 00 02  f3 ab ea 1f 06 00 00 80  
> > |................|
> >    00000020  fa 8f 7e 02 b2 80 52 52  be 1f 07 e8 4a 01 bb 94  
> > |..~...RR....J...|
> >    00000030  07 8d af 2a 00 8a 46 04  84 c0 74 0a 80 7e 00 80  
> > |...*..F...t..~..|
> >    00000040  75 04 89 2e 84 0b 83 c5  10 83 c3 09 80 fb b8 75  
> > |u..............u|
> >    00000050  e4 b8 e1 00 c1 e0 02 89  c6 8b b4 00 08 85 f6 75  
> > |...............u|
> >    00000060  19 b8 2f 07 be 15 07 e8  14 01 89 c6 e8 09 01 5a  
> > |../............Z|
> >    00000070  31 c0 cd 13 cd 18 fb f4  eb fc 66 8b 6c 08 f6 06  
> > |1.........f.l...|
> >    00000080  91 07 04 75 43 5a 52 b4  08 cd 13 8b 44 02 50 c0  
> > |...uCZR.....D.P.|
> >    00000090  e8 06 86 c4 c1 ea 08 42  f7 e2 8a 54 01 01 d0 83  
> > |.......B...T....|
> >    000000a0  e1 3f f7 e1 5a 83 e2 3f  01 d0 48 39 e8 74 47 bb  
> > |.?..Z..?..H9.tG.|
> >    000000b0  aa 55 b4 41 5a 52 cd 13  b8 67 07 72 a7 81 fb 55  
> > |.U.AZR...g.r...U|
> >    000000c0  aa 75 a1 f6 c1 01 74 9c  66 89 2e 0d 07 be 05 07  
> > |.u....t.f.......|
> >    000000d0  b4 42 5a 52 cd 13 b8 43  07 72 89 a0 00 7c 84 c0  
> > |.BZR...C.r...|..|
> >    000000e0  74 03 a1 fe 7d 3d 55 aa  b8 53 07 0f 85 75 ff 66  
> > |t...}=U..S...u.f|
> >    000000f0  89 ee 5a e9 0a 75 5a 8a  74 01 8b 4c 02 bb 00 7c  
> > |..Z..uZ.t..L...||
> >    00000100  b8 01 02 eb ce 10 00 01  00 00 7c 00 00 00 00 00  
> > |..........|.....|
> >    00000110  00 00 00 00 00 45 72 72  6f 72 20 00 0d 0a 00 4e  |.....Error 
> > ....N|<
> >    00000120  65 74 42 53 44 20 4d 42  52 20 62 6f 6f 74 00 4e  |etBSD MBR 
> > boot.N|<
> >    00000130  6f 20 61 63 74 69 76 65  20 70 61 72 74 69 74 69  |o active 
> > partiti|<
> >    00000140  6f 6e 00 44 69 73 6b 20  72 65 61 64 20 65 72 72  |on.Disk 
> > read err|<
> >    00000150  6f 72 00 4e 6f 20 6f 70  65 72 61 74 69 6e 67 20  |or.No 
> > operating |<
> >    00000160  73 79 73 74 65 6d 00 49  6e 76 61 6c 69 64 20 43  
> > |system.Invalid C|<
> >    00000170  48 53 20 72 65 61 64 00  e8 03 00 be 1c 07 60 ac  |HS 
> > read.......`.|<
> >    00000180  b4 0e bb 01 00 cd 10 ac  84 c0 75 f4 61 c3 00 00  
> > |..........u.a...|
> >    00000190  1c 80 b6 00 00 00 00 00  00 00 00 00 00 00 00 00  
> > |................|
> >    000001a0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  
> > |................|
> >    000001b0  00 00 00 00 00 00 00 00  00 00 00 00 e1 b5        
> > |..............|
> >    000001be
> > 
> > 
> > 
> >    Petar Bogdanovic
> > 
> > 
> > 
> 
> This is what fdisk says:
> 
> # fdisk wd0
> Disk: /dev/rwd0d
> NetBSD disklabel disk geometry:
> cylinders: 969021, heads: 16, sectors/track: 63 (1008 sectors/cylinder)
> total sectors: 976773168
> 
> BIOS disk geometry:
> cylinders: 1023, heads: 81, sectors/track: 63 (5103 sectors/cylinder)
> total sectors: 976773168
> 
> Partition table:
> 0: NetBSD (sysid 169)
>     start 63, size 976773105 (476940 MB, Cyls 0-191411/44/63), Active
> 1: <UNUSED>
> 2: <UNUSED>
> 3: <UNUSED>
> Bootselector disabled.
> First active partition: 0
> 
> 
> 
> And this is first 466 bytes:
> 
> # dd if=/dev/wd0d bs=1 count=446 2>/dev/null | hexdump -C
> 00000000  31 c0 8e d0 bc 00 7c 8e  c0 8e d8 bf 1d 06 be 1d  |1.....|.........|
> 00000010  7c 50 57 b9 e3 01 f3 a4  b5 03 f3 ab cb 80 fa 8f  ||PW.............|
> 00000020  7e 02 b2 80 52 52 bb 94  07 8d af 2a 00 8a 46 04  |~...RR.....*..F.|
> 00000030  84 c0 74 0a 80 7e 00 80  75 04 89 2e 84 0b 83 c5  |..t..~..u.......|
> 00000040  10 83 c3 09 80 fb b8 75  e4 b8 e1 00 c1 e0 02 89  |.......u........|
> 00000050  c6 8b b4 00 08 85 f6 75  19 b8 17 07 50 be 0d 07  |.......u....P...|
> 00000060  e8 03 01 5e e8 f9 00 5a  31 c0 cd 13 cd 18 fb f4  |...^...Z1.......|
> 00000070  eb fc 66 8b 6c 08 f6 06  91 07 04 75 43 5a 52 b4  |..f.l......uCZR.|
> 00000080  08 cd 13 8b 44 02 50 c0  e8 06 86 c4 c1 ea 08 42  |....D.P........B|
> 00000090  f7 e2 8a 54 01 01 d0 83  e1 3f f7 e1 5a 83 e2 3f  |...T.....?..Z..?|
> 000000a0  01 d0 48 39 e8 74 47 bb  aa 55 b4 41 5a 52 cd 13  |..H9.tG..U.AZR..|
> 000000b0  b8 4f 07 72 a7 81 fb 55  aa 75 a1 f6 c1 01 74 9c  |.O.r...U.u....t.|
> 000000c0  66 89 2e 05 07 be fd 06  b4 42 5a 52 cd 13 b8 2b  |f........BZR...+|
> 000000d0  07 72 89 a0 00 7c 84 c0  74 03 a1 fe 7d 3d 55 aa  |.r...|..t...}=U.|
> 000000e0  b8 3b 07 0f 85 75 ff 66  89 ee 5a e9 12 75 5a 8a  |.;...u.f..Z..uZ.|
> 000000f0  74 01 8b 4c 02 bb 00 7c  b8 01 02 eb ce 10 00 01  |t..L...|........|
> 00000100  00 00 7c 00 00 00 00 00  00 00 00 00 00 45 72 72  |..|..........Err|
> 00000110  6f 72 20 00 0d 0a 00 4e  6f 20 61 63 74 69 76 65  |or ....No active|
> 00000120  20 70 61 72 74 69 74 69  6f 6e 00 44 69 73 6b 20  | partition.Disk |
> 00000130  72 65 61 64 20 65 72 72  6f 72 00 4e 6f 20 6f 70  |read error.No op|
> 00000140  65 72 61 74 69 6e 67 20  73 79 73 74 65 6d 00 49  |erating system.I|
> 00000150  6e 76 61 6c 69 64 20 43  48 53 20 72 65 61 64 00  |nvalid CHS read.|
> 00000160  e8 03 00 be 14 07 60 ac  b4 0e bb 01 00 cd 10 ac  |......`.........|
> 00000170  84 c0 75 f4 61 c3 00 00  00 00 00 00 00 00 00 00  |..u.a...........|
> 00000180  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
> 00000190  1c 80 b6 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
> 000001a0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
> 000001b0  00 00 00 00 00 00 00 00  00 00 00 00 e1 b5        |..............|
> 000001be

Why don't you just copy the first few MBs from the bootable disk onto
the new replacement, reboot the machine and rebuild the set? That will
give you the same mbr/disklabel setup on both disks and you could then
retry booting from the new disk.



   Petar Bogdanovic

Follow-Ups:
- Re: installing bootblocks on a new drive
  - From: Milos Negovanovic
- Re: installing bootblocks on a new drive
  - From: Milos Negovanovic

References:
- installing bootblocks on a new drive
  - From: Milos Negovanovic
- Re: installing bootblocks on a new drive
  - From: Petar Bogdanovic
- Re: installing bootblocks on a new drive
  - From: Petar Bogdanovic
- Re: installing bootblocks on a new drive
  - From: Milos Negovanovic

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