Re: Floating disk geometry

Sergey Yudin Tue, 30 Jun 2009 23:57:35 -0700

How to understand in installation time which geometry is "correct" forcurent disk? What is the starting point for calculations? Number of sectors?

In which case, if you want to set it right, your best bet is to say
'No' to letting OpenBSD use the whole disk, then setting the correct
geometry by hand.


JMTC

Please can someone tell why disk geometry changed after install

in installation time on empty sd0:

Disk: sd0       geometry: 78753/2/911 [143638992 Sectors]
Offset: 0       Signature: 0x0
          Starting         Ending         LBA Info:
#: id      C   H   S -      C   H   S [       start:        size ]

-------------------------------------------------------------------------------
0: 00      0   0   0 -      0   0   0 [           0:           0 ] unused
1: 00      0   0   0 -      0   0   0 [           0:           0 ] unused
2: 00      0   0   0 -      0   0   0 [           0:           0 ] unused
3: 00      0   0   0 -      0   0   0 [           0:           0 ] unused

This is a garbage MBR. Look at the signature and the crazy geometry.

no it is not a garbage.. It's just zero filled disk. Geometry detection
process uses info from preexisting partition table?

       -Otto

after install geometry shown as:

Disk: sd0       geometry: 8941/255/63 [143638992 Sectors]
Offset: 0       Signature: 0xAA55
          Starting         Ending         LBA Info:
#: id      C   H   S -      C   H   S [       start:        size ]

-------------------------------------------------------------------------------
0: 00      0   0   0 -      0   0   0 [           0:           0 ] unused
1: 00      0   0   0 -      0   0   0 [           0:           0 ] unused
2: 00      0   0   0 -      0   0   0 [           0:           0 ] unused
*3: A6      0  14  30 -   8931 181  48 [         911:   143487055 ]
OpenBSD

thanks a lot




OpenBSD 4.5 (GENERIC) #1749: Sat Feb 28 14:51:18 MST 2009
  dera...@i386.openbsd.org:/usr/src/sys/arch/i386/compile/GENERIC
cpu0: Intel Pentium II ("GenuineIntel" 686-class, 512KB L2 cache) 350 MHz
cpu0:
 
FPU,V86,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR
real mem  = 268005376 (255MB)
avail mem = 250855424 (239MB)
mainbus0 at root
bios0 at mainbus0: AT/286+ BIOS, date 09/30/98, BIOS32 rev. 0 @ 0xfd760
mpbios0 at bios0: Intel MP Specification 1.4
cpu0 at mainbus0: apid 0 (boot processor)
cpu0: apic clock running at 99MHz
mpbios0: bus 0 is type PCI  mpbios0: bus 1 is type PCI  mpbios0: bus 2 is
type PCI  mpbios0: bus 3 is type ISA  ioapic0 at mainbus0: apid 1 pa
0xfec00000, version 11, 24 pins
pcibios0 at bios0: rev 2.1 @ 0xfd760/0x8a0
pcibios0: PCI IRQ Routing Table rev 1.0 @ 0xfdef0/240 (13 entries)
pcibios0: PCI Interrupt Router at 000:02:0 ("Intel 82371FB ISA" rev 0x00)
pcibios0: PCI bus #2 is the last bus
WARNING: can't reserve area for I/O APIC.
bios0: ROM list: 0xc0000/0x8000 0xc8000/0x5000 0xcd000/0x800
pci0 at mainbus0 bus 0: configuration mode 1 (bios)
pchb0 at pci0 dev 0 function 0 "Intel 82443BX AGP" rev 0x02
intelagp0 at pchb0
agp0 at intelagp0: aperture at 0x10000000, size 0x4000000
ppb0 at pci0 dev 1 function 0 "Intel 82443BX AGP" rev 0x02
pci1 at ppb0 bus 1
piixpcib0 at pci0 dev 2 function 0 "Intel 82371AB PIIX4 ISA" rev 0x02
pciide0 at pci0 dev 2 function 1 "Intel 82371AB IDE" rev 0x01: DMA,
 channel 0 wired to compatibility, channel 1 wired to compatibility
pciide0: channel 0 ignored (disabled)
pciide0: channel 1 ignored (disabled)
uhci0 at pci0 dev 2 function 2 "Intel 82371AB USB" rev 0x01: apic 1 int
 19 (irq 11)
piixpm0 at pci0 dev 2 function 3 "Intel 82371AB Power" rev 0x02: SMI
iic0 at piixpm0
spdmem0 at iic0 addr 0x50: 128MB SDRAM ECC PC100CL3
spdmem1 at iic0 addr 0x51: 128MB SDRAM ECC PC100CL3
fxp0 at pci0 dev 3 function 0 "Intel 8255x" rev 0x05, i82558: apic 1 int
 16 (irq 9), address 00:c0:0d:00:94:4f
inphy0 at fxp0 phy 1: i82555 10/100 PHY, rev. 0
vga1 at pci0 dev 4 function 0 "Cirrus Logic CL-GD5430" rev 0x22
wsdisplay0 at vga1 mux 1: console (80x25, vt100 emulation)
wsdisplay0: screen 1-5 added (80x25, vt100 emulation)
ppb1 at pci0 dev 5 function 0 "DEC 21150 PCI-PCI" rev 0x04
pci_intr_map: bus 0 dev 5 func 0 pin 1; line 9
pci_intr_map: no MP mapping found
pci_intr_map: bus 0 dev 5 func 0 pin 2; line 10
pci_intr_map: no MP mapping found
pci_intr_map: bus 0 dev 5 func 0 pin 3; line 9
pci_intr_map: no MP mapping found
pci_intr_map: bus 0 dev 5 func 0 pin 4; line 11
pci_intr_map: no MP mapping found
pci2 at ppb1 bus 2
ahc0 at pci2 dev 1 function 0 "Adaptec AIC-7890/1 U2" rev 0x00: apic 1
 int 17 (irq 10)
scsibus0 at ahc0: 16 targets, initiator 7
sd0 at scsibus0 targ 0 lun 0: <FUJITSU, MAW3073NC, 0104> SCSI3 0/direct
 fixed
sd0: 70136MB, 512 bytes/sec, 143638992 sec total
ahc1 at pci2 dev 9 function 0 "Adaptec AIC-7890/1 U2" rev 0x00: apic 1
 int 17 (irq 10)
scsibus1 at ahc1: 16 targets, initiator 7
cd0 at scsibus1 targ 5 lun 0: <PLEXTOR, CD-ROM PX-32TS, 1.03> SCSI2
 5/cdrom removable
eap0 at pci0 dev 20 function 0 "Ensoniq AudioPCI97" rev 0x06: apic 1 int
 16 (irq 9)
ac97: codec id 0x83847609 (SigmaTel STAC9721/23)
ac97: codec features 18 bit DAC, 18 bit ADC, SigmaTel 3D
audio0 at eap0
midi0 at eap0: <AudioPCI MIDI UART>
isa0 at piixpcib0
isadma0 at isa0
com0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo
com1 at isa0 port 0x2f8/8 irq 3: ns16550a, 16 byte fifo
pckbc0 at isa0 port 0x60/5
pckbd0 at pckbc0 (kbd slot)
pckbc0: using irq 1 for kbd slot
wskbd0 at pckbd0: console keyboard, using wsdisplay0
pcppi0 at isa0 port 0x61
midi1 at pcppi0: <PC speaker>
spkr0 at pcppi0
lpt0 at isa0 port 0x378/4 irq 7
npx0 at isa0 port 0xf0/16: reported by CPUID; using exception 16
fdc0 at isa0 port 0x3f0/6 irq 6 drq 2
fd0 at fdc0 drive 0: 1.44MB 80 cyl, 2 head, 18 sec
usb0 at uhci0: USB revision 1.0
uhub0 at usb0 "Intel UHCI root hub" rev 1.00/1.00 addr 1
mtrr: Pentium Pro MTRR support
softraid0 at root
ahc0: target 0 using 16bit transfers
ahc0: target 0 synchronous at 40.0MHz, offset = 0x7f
root on sd0a swap on sd0b dump on sd0b

Re: Floating disk geometry

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