Can't mount existing data disk after upgrade (disklabel gone)
Ruben Bloemgarten
rubenl at bloemgarten.demon.nl
Fri Jan 20 11:30:33 PST 2006
Joe,
If you did not touch ad4 the disklabel it should still have been there, but
I presume that you have destroyed it by now. Did you make any kind of backup
? such as a dump of the filesystem ? How did you try to mount ad4s1a ? ( I
am assuming you tried to mount the 'partition' and not the slice (ad4s1) or
the device (ad4)). Why are you changing the offset of ad4s1a from 16 to
2097215 ? Is there another partition on there somewhere or do you just not
want to use that part of your disk ? Also, you scan_ffs ad4 instead of ad4s1
which is what you should be interested in. The size differences are normal
because there's a difference between ad4 ad4s1 and ad4s1a. You want to write
the correct disklabel to ad4s1 and then mount ad4s1a. You're 'a' partition
extends past the size of the disk (c) because a(584002180)+offset(2097215)=
586099395 > c:( 586099332) (by 63)
If you can correctly replicate the exact disklabel you should be able to
access your data. Otherwise, chalk it up to experience.
I hope this helps.
Ruben
-----Original Message-----
From: owner-freebsd-questions at freebsd.org
[mailto:owner-freebsd-questions at freebsd.org] On Behalf Of Joe S
Sent: January 20, 2006 6:18 PM
To: freebsd-questions at freebsd.org
Cc: Joe S
Subject: Can't mount existing data disk after upgrade (disklabel gone)
First of all, I have learned something VERY important about FreeBSD.
SAVE your DISKLABELS!
I have 2 drives in my home file server. One 80GB drive (ad0) for the OS
and one 300 GB drive for my data. A few days ago, I performed a clean
install of FreeBSD 6.0 on the 1st drive (ad0). After the install I tried
to mount ad4, but could not. I read somewhere that I was supposed to
save my disklabels. DOH! I did not do this, nor have I ever read about
this in the FreeBSD handbook.
After reading through the handbook and googling, I found a tool called
scan_ffs that can help me recreate my disklabels by scanning my drive
for partitions. Great!
Here is the output of scan_ffs on ad4:
root at coruscant# scan_ffs -l /dev/ad4
X: 584002180 2097215 4.2BSD 2048 16384 0 # /data
Good. That is my /data partition. Its UFS2, created in FBSD 5.4.
Next, I tried editing the disklabel. It starts out like this:
# /dev/ad4s1:
8 partitions:
# size offset fstype [fsize bsize bps/cpg]
a: 586099316 16 unused 0 0
c: 586099332 0 unused 0 0
I changed it to this:
# /dev/ad4s1:
8 partitions:
# size offset fstype [fsize bsize bps/cpg]
a: 584002180 2097215 4.2BSD 2048 16384 0 # /data
c: 586099332 0 unused 0 0
But, I get this error:
partition a: partition extends past end of unit
re-edit the label? [y]:
Here is the output of bsdlabel. Notice the different sizes:
root at coruscant# bsdlabel -r ad4
# /dev/ad4:
8 partitions:
# size offset fstype [fsize bsize bps/cpg]
a: 586114688 16 unused 0 0
c: 586114704 0 unused 0 0
root at coruscant# bsdlabel -r ad4s1
# /dev/ad4s1:
8 partitions:
# size offset fstype [fsize bsize bps/cpg]
a: 586099316 16 unused 0 0
c: 586099332 0 unused 0 0
root at coruscant#
root at coruscant# bsdlabel -r ad4s1a
# /dev/ad4s1a:
8 partitions:
# size offset fstype [fsize bsize bps/cpg]
a: 586099300 16 unused 0 0
c: 586099316 0 unused 0 0
When I try to mount /dev/ad4s1a to /data, I get this error:
coruscant# mount /dev/ad4s1a /mnt
mount: /dev/ad4s1a on /mnt: incorrect super block
How can I properly re-create the disklabel? It seems this is what I need
to do in order to get to my data. Any help would be greatly appreciated.
-joe
PS> Here is my dmesg:
Copyright (c) 1992-2005 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
The Regents of the University of California. All rights reserved.
FreeBSD 6.0-SECURITY #0: Mon Dec 19 23:46:33 UTC 2005
root at builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC
ACPI APIC Table: <INTEL D865PERL>
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: Intel(R) Pentium(R) 4 CPU 2.40GHz (2394.01-MHz 686-class CPU)
Origin = "GenuineIntel" Id = 0xf29 Stepping = 9
Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA
,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
Features2=0x4400<CNTX-ID,<b14>>
real memory = 1072889856 (1023 MB)
avail memory = 1040945152 (992 MB)
ioapic0 <Version 2.0> irqs 0-23 on motherboard
npx0: [FAST]
npx0: <math processor> on motherboard
npx0: INT 16 interface
acpi0: <INTEL D865PERL> on motherboard
acpi0: Power Button (fixed)
pci_link0: <ACPI PCI Link LNKA> irq 11 on acpi0
pci_link1: <ACPI PCI Link LNKB> irq 3 on acpi0
pci_link2: <ACPI PCI Link LNKC> irq 10 on acpi0
pci_link3: <ACPI PCI Link LNKD> irq 5 on acpi0
pci_link4: <ACPI PCI Link LNKE> irq 0 on acpi0
pci_link5: <ACPI PCI Link LNKF> irq 0 on acpi0
pci_link6: <ACPI PCI Link LNKG> irq 9 on acpi0
pci_link7: <ACPI PCI Link LNKH> irq 9 on acpi0
Timecounter "ACPI-fast" frequency 3579545 Hz quality 1000
acpi_timer0: <24-bit timer at 3.579545MHz> port 0x408-0x40b on acpi0
cpu0: <ACPI CPU> on acpi0
acpi_throttle0: <ACPI CPU Throttling> on cpu0
pcib0: <ACPI Host-PCI bridge> port 0xcf8-0xcff on acpi0
pci0: <ACPI PCI bus> on pcib0
agp0: <Intel 82865 host to AGP bridge> mem 0xf8000000-0xfbffffff at
device 0.0 on pci0
pcib1: <ACPI PCI-PCI bridge> at device 1.0 on pci0
pci1: <ACPI PCI bus> on pcib1
pci1: <display, VGA> at device 0.0 (no driver attached)
uhci0: <Intel 82801EB (ICH5) USB controller USB-A> port 0xcc00-0xcc1f
irq 16 at device 29.0 on pci0
uhci0: [GIANT-LOCKED]
usb0: <Intel 82801EB (ICH5) USB controller USB-A> on uhci0
usb0: USB revision 1.0
uhub0: Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub0: 2 ports with 2 removable, self powered
uhci1: <Intel 82801EB (ICH5) USB controller USB-B> port 0xd000-0xd01f
irq 19 at device 29.1 on pci0
uhci1: [GIANT-LOCKED]
usb1: <Intel 82801EB (ICH5) USB controller USB-B> on uhci1
usb1: USB revision 1.0
uhub1: Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub1: 2 ports with 2 removable, self powered
uhci2: <Intel 82801EB (ICH5) USB controller USB-C> port 0xd400-0xd41f
irq 18 at device 29.2 on pci0
uhci2: [GIANT-LOCKED]
usb2: <Intel 82801EB (ICH5) USB controller USB-C> on uhci2
usb2: USB revision 1.0
uhub2: Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub2: 2 ports with 2 removable, self powered
uhci3: <Intel 82801EB (ICH5) USB controller USB-D> port 0xd800-0xd81f
irq 16 at device 29.3 on pci0
uhci3: [GIANT-LOCKED]
usb3: <Intel 82801EB (ICH5) USB controller USB-D> on uhci3
usb3: USB revision 1.0
uhub3: Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub3: 2 ports with 2 removable, self powered
ehci0: <EHCI (generic) USB 2.0 controller> mem 0xfebffc00-0xfebfffff irq
23 at device 29.7 on pci0
ehci0: [GIANT-LOCKED]
usb4: EHCI version 1.0
usb4: companion controllers, 2 ports each: usb0 usb1 usb2 usb3
usb4: <EHCI (generic) USB 2.0 controller> on ehci0
usb4: USB revision 2.0
uhub4: Intel EHCI root hub, class 9/0, rev 2.00/1.00, addr 1
uhub4: 8 ports with 8 removable, self powered
pcib2: <ACPI PCI-PCI bridge> at device 30.0 on pci0
pci2: <ACPI PCI bus> on pcib2
atapci0: <Promise PDC20270 UDMA100 controller> port
0xbc00-0xbc07,0xb800-0xb803,0xb400-0xb407,0xb000-0xb003,0xac00-0xac0f
mem 0xfeaf0000-0xfeafffff irq 22 at device 1.0 on pci2
ata2: <ATA channel 0> on atapci0
ata3: <ATA channel 1> on atapci0
ahc0: <Adaptec 2940 Ultra2 SCSI adapter> port 0xa800-0xa8ff mem
0xfeadf000-0xfeadffff irq 17 at device 2.0 on pci2
ahc0: [GIANT-LOCKED]
aic7890/91: Ultra2 Wide Channel A, SCSI Id=7, 32/253 SCBs
fxp0: <Intel 82559 Pro/100 Ethernet> port 0xa400-0xa43f mem
0xfeade000-0xfeadefff,0xfe900000-0xfe9fffff irq 18 at device 4.0 on pci2
miibus0: <MII bus> on fxp0
inphy0: <i82555 10/100 media interface> on miibus0
inphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
fxp0: Ethernet address: 00:d0:b7:9f:dd:0f
isab0: <PCI-ISA bridge> at device 31.0 on pci0
isa0: <ISA bus> on isab0
atapci1: <Intel ICH5 UDMA100 controller> port
0x1f0-0x1f7,0x3f6,0x170-0x177,0x376,0xffa0-0xffaf at device 31.1 on pci0
ata0: <ATA channel 0> on atapci1
ata1: <ATA channel 1> on atapci1
atapci2: <Intel ICH5 SATA150 controller> port
0xec00-0xec07,0xe800-0xe803,0xe400-0xe407,0xe000-0xe003,0xdc00-0xdc0f
irq 18 at device 31.2 on pci0
atapci2: failed to enable memory mapping!
ata4: <ATA channel 0> on atapci2
ata5: <ATA channel 1> on atapci2
pci0: <serial bus, SMBus> at device 31.3 (no driver attached)
acpi_button0: <Sleep Button> on acpi0
atkbdc0: <Keyboard controller (i8042)> port 0x60,0x64 irq 1 on acpi0
atkbd0: <AT Keyboard> irq 1 on atkbdc0
kbd0 at atkbd0
atkbd0: [GIANT-LOCKED]
sio0: configured irq 4 not in bitmap of probed irqs 0
sio0: port may not be enabled
sio0: <16550A-compatible COM port> port 0x3f8-0x3ff irq 4 flags 0x10 on
acpi0
sio0: type 16550A
ppc0: <Standard parallel printer port> port 0x378-0x37f irq 7 on acpi0
ppc0: Generic chipset (NIBBLE-only) in COMPATIBLE mode
ppbus0: <Parallel port bus> on ppc0
plip0: <PLIP network interface> on ppbus0
lpt0: <Printer> on ppbus0
lpt0: Interrupt-driven port
ppi0: <Parallel I/O> on ppbus0
pmtimer0 on isa0
orm0: <ISA Option ROMs> at iomem
0xc0000-0xcf7ff,0xcf800-0xd7fff,0xd8000-0xd87ff,0xd8800-0xd9fff,0xda000-0xda
fff
on isa0
sc0: <System console> at flags 0x100 on isa0
sc0: VGA <16 virtual consoles, flags=0x300>
sio1: configured irq 3 not in bitmap of probed irqs 0
sio1: port may not be enabled
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
Timecounter "TSC" frequency 2394008600 Hz quality 800
Timecounters tick every 1.000 msec
Waiting 5 seconds for SCSI devices to settle
ad0: 76319MB <WDC WD800JB-00CRA1 17.07W17> at ata0-master UDMA100
acd0: CDROM <CDU5211/YYS7> at ata1-master UDMA33
ad4: 286188MB <Maxtor 6B300R0 BAH41B70> at ata2-master UDMA100
ad4: Promise subdisks has no flags
sa0 at ahc0 bus 0 target 0 lun 0
sa0: <SONY SDX-300C 0300> Removable Sequential Access SCSI-2 device
sa0: 20.000MB/s transfers (10.000MHz, offset 15, 16bit)
Trying to mount root from ufs:/dev/ad0s1a
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