Date: Fri, 20 Jan 2006 09:18:07 -0800 From: Joe S <js.lists@gmail.com> To: freebsd-questions@freebsd.org Cc: Joe S <js.lists@gmail.com> Subject: Can't mount existing data disk after upgrade (disklabel gone) Message-ID: <43D11B4F.90806@gmail.com>
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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@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@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@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@coruscant#
root@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@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,0xda000-0xdafff
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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