fdisk on centos 6

09-15-2011, 08:57 PM

I am getting the WRONG values reported from fdisk on centos 6.
This is listing an 8G CF card on /dev/sde

Disk /dev/sde: 8019 MB, 8019099648 bytes
247 heads, 62 sectors/track, 1022 cylinders
Units = cylinders of 15314 * 512 = 7840768 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xd1b46611

It should be 255 heads, 63 sectors/track.

Under centos 5 this is reported correctly.

I even tried specifying the -S 63 -H 255 on the fdisk command line -
that did not help.

my symptom is when I setup my CF card to run linux - I get a grub error 2.

What kind of madness is happening?

Jerry
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09-15-2011, 09:34 PM

on 9/15/2011 1:57 PM Jerry Geis spake the following:
> I am getting the WRONG values reported from fdisk on centos 6.
> This is listing an 8G CF card on /dev/sde
>
> Disk /dev/sde: 8019 MB, 8019099648 bytes
> 247 heads, 62 sectors/track, 1022 cylinders
> Units = cylinders of 15314 * 512 = 7840768 bytes
> Sector size (logical/physical): 512 bytes / 512 bytes
> I/O size (minimum/optimal): 512 bytes / 512 bytes
> Disk identifier: 0xd1b46611
>
>
> It should be 255 heads, 63 sectors/track.
>
> Under centos 5 this is reported correctly.
>
> I even tried specifying the -S 63 -H 255 on the fdisk command line -
> that did not help.
>
> my symptom is when I setup my CF card to run linux - I get a grub error 2.
>
> What kind of madness is happening?
>
> Jerry
I think the fdisk in 6 tries to align on 4k boundaries. Does fdisk -c do the
same thing?

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09-15-2011, 10:03 PM

> I think the fdisk in 6 tries to align on 4k boundaries. Does fdisk -c do the
> same thing?
>

Scott - thanks I just tried -cu and same result.

jerry

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09-16-2011, 10:59 AM

On 09/15/2011 06:03 PM, Jerry Geis wrote:

I think the fdisk in 6 tries to align on 4k boundaries. Does fdisk -c do the
same thing?

Scott - thanks I just tried -cu and same result.

jerry

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have you tried sfdisk?

--

Stephen*Clark

NetWolves

Sr.*Software*Engineer*III

Phone:*813-579-3200

Fax:*813-882-0209

Email:*steve.clark@netwolves.com

http://www.netwolves.com

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09-16-2011, 12:10 PM

On 09/16/2011 06:59 AM, Steve Clark wrote:
> On 09/15/2011 06:03 PM, Jerry Geis wrote:
>>> I think the fdisk in 6 tries to align on 4k boundaries. Does fdisk -c do the
>>> same thing?
>>>
>> Scott - thanks I just tried -cu and same result.
>>
>> jerry
>>
>> _______________________________________________
>> CentOS mailing list
>> CentOS@centos.org
>> http://lists.centos.org/mailman/listinfo/centos
>>
> have you tried sfdisk?
>
>
Steve - I had not - but asking sfdisk to list the device on centos has
the wrong geometry to start
with just like fdisk does. it should be 255 heads and 63 sectors.

sfdisk -v
sfdisk (util-linux-ng 2.17.2)

sfdisk -l /dev/sde

Disk /dev/sde: 1022 cylinders, 247 heads, 62 sectors/track
Warning: The partition table looks like it was made
for C/H/S=*/255/63 (instead of 1022/247/62).
For this listing I'll assume that geometry.
Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0

Device Boot Start End #cyls #blocks Id System
/dev/sde1 * 0+ 974- 975- 7830616+ b W95 FAT32
end: (c,h,s) expected (974,221,63) found (1023,254,63)
/dev/sde2 0 - 0 0 0 Empty
/dev/sde3 0 - 0 0 0 Empty
/dev/sde4 0 - 0 0 0 Empty

----------------
This is centos 5
sfdisk -v
sfdisk (util-linux 2.13-pre7)

sfdisk -l /dev/sdb

Disk /dev/sdb: 974 cylinders, 255 heads, 63 sectors/track
Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0

Device Boot Start End #cyls #blocks Id System
/dev/sdb1 * 0+ 851 852- 6843658+ 83 Linux
/dev/sdb2 852 973 122 979965 82 Linux swap / Solaris
/dev/sdb3 0 - 0 0 0 Empty
/dev/sdb4 0 - 0 0 0 Empty

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09-16-2011, 12:37 PM

On 09/16/2011 08:10 AM, Jerry Geis wrote:

On 09/16/2011 06:59 AM, Steve Clark wrote:

On 09/15/2011 06:03 PM, Jerry Geis wrote:

I think the fdisk in 6 tries to align on 4k boundaries. Does fdisk -c do the
same thing?

Scott - thanks I just tried -cu and same result.

jerry

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have you tried sfdisk?

Steve - I had not - but asking sfdisk to list the device on centos has
the wrong geometry to start
with just like fdisk does. it should be 255 heads and 63 sectors.

sfdisk -v
sfdisk (util-linux-ng 2.17.2)

sfdisk -l /dev/sde

Disk /dev/sde: 1022 cylinders, 247 heads, 62 sectors/track
Warning: The partition table looks like it was made
for C/H/S=*/255/63 (instead of 1022/247/62).
For this listing I'll assume that geometry.
Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0

Device Boot Start End #cyls #blocks Id System
/dev/sde1 * 0+ 974- 975- 7830616+ b W95 FAT32
end: (c,h,s) expected (974,221,63) found (1023,254,63)
/dev/sde2 0 - 0 0 0 Empty
/dev/sde3 0 - 0 0 0 Empty
/dev/sde4 0 - 0 0 0 Empty

----------------
This is centos 5
sfdisk -v
sfdisk (util-linux 2.13-pre7)

sfdisk -l /dev/sdb

Disk /dev/sdb: 974 cylinders, 255 heads, 63 sectors/track
Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0

Device Boot Start End #cyls #blocks Id System
/dev/sdb1 * 0+ 851 852- 6843658+ 83 Linux
/dev/sdb2 852 973 122 979965 82 Linux swap / Solaris
/dev/sdb3 0 - 0 0 0 Empty
/dev/sdb4 0 - 0 0 0 Empty

Hmm...

I have an automated script that installs C6 on devices - I have
used it on sata drives, ssds and

CF. The first thing I do is dd of=$DRIVE if=/dev/zero bs=1024
count=1 to wipe out the existing

partition table then I do

# 1MB = 2048 512byte sectors

DSIZE=`sfdisk -s -uS $DRIVE`

DSIZE=$((DSIZE*2))

Log "DSIZE is $DSIZE"

#OFFSET=2048

OFFSET=8

SWAP=1000000

BOOT=600000

PSIZE=$(((DSIZE-(OFFSET+BOOT+SWAP+10))/2))

PSIZE=$((PSIZE+(PSIZE%2)))

PSTART=$((PSIZE+BOOT+SWAP+OFFSET))

Log "PSIZE is $PSIZE"

Log "PSTART is $PSTART"

# partition the disk for /boot, swap, /

#/sbin/sfdisk -q -uS $DRIVE << EOF

#8,600000,L,*

#,1000000,S

#,,L

#EOF

/sbin/sfdisk -f -q -uS $DRIVE << EOF

$OFFSET,$BOOT,L,*

$((OFFSET+BOOT)),$SWAP,S

$((OFFSET+BOOT+SWAP)),$PSIZE,L

$PSTART,,L

EOF

I am creating two linux partitions and a swap partition.

The swap is fixed and the two linux partitions are approximately

equal.

I have had no problem booting C6 after doing this.

--

Stephen*Clark

NetWolves

Sr.*Software*Engineer*III

Phone:*813-579-3200

Fax:*813-882-0209

Email:*steve.clark@netwolves.com

http://www.netwolves.com

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09-16-2011, 12:41 PM

On 09/16/2011 08:37 AM, Steve Clark wrote:
> On 09/16/2011 08:10 AM, Jerry Geis wrote:
>> On 09/16/2011 06:59 AM, Steve Clark wrote:
>>> On 09/15/2011 06:03 PM, Jerry Geis wrote:
>>>>> I think the fdisk in 6 tries to align on 4k boundaries. Does fdisk -c do the
>>>>> same thing?
>>>>>
>>>> Scott - thanks I just tried -cu and same result.
>>>>
>>>> jerry
>>>>
>>>> _______________________________________________
>>>> CentOS mailing list
>>>> CentOS@centos.org
>>>> http://lists.centos.org/mailman/listinfo/centos
>>>>
>>> have you tried sfdisk?
>>>
>>>
>> Steve - I had not - but asking sfdisk to list the device on centos has
>> the wrong geometry to start
>> with just like fdisk does. it should be 255 heads and 63 sectors.
>>
>> sfdisk -v
>> sfdisk (util-linux-ng 2.17.2)
>>
>> sfdisk -l /dev/sde
>>
>> Disk /dev/sde: 1022 cylinders, 247 heads, 62 sectors/track
>> Warning: The partition table looks like it was made
>> for C/H/S=*/255/63 (instead of 1022/247/62).
>> For this listing I'll assume that geometry.
>> Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0
>>
>> Device Boot Start End #cyls #blocks Id System
>> /dev/sde1 * 0+ 974- 975- 7830616+ b W95 FAT32
>> end: (c,h,s) expected (974,221,63) found (1023,254,63)
>> /dev/sde2 0 - 0 0 0 Empty
>> /dev/sde3 0 - 0 0 0 Empty
>> /dev/sde4 0 - 0 0 0 Empty
>>
>>
>> ----------------
>> This is centos 5
>> sfdisk -v
>> sfdisk (util-linux 2.13-pre7)
>>
>> sfdisk -l /dev/sdb
>>
>> Disk /dev/sdb: 974 cylinders, 255 heads, 63 sectors/track
>> Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0
>>
>> Device Boot Start End #cyls #blocks Id System
>> /dev/sdb1 * 0+ 851 852- 6843658+ 83 Linux
>> /dev/sdb2 852 973 122 979965 82 Linux swap / Solaris
>> /dev/sdb3 0 - 0 0 0 Empty
>> /dev/sdb4 0 - 0 0 0 Empty
>>
>>
> Hmm...
> I have an automated script that installs C6 on devices - I have used
> it on sata drives, ssds and
> CF. The first thing I do is dd of=$DRIVE if=/dev/zero bs=1024 count=1
> to wipe out the existing
> partition table then I do
>
> # 1MB = 2048 512byte sectors
> DSIZE=`sfdisk -s -uS $DRIVE`
> DSIZE=$((DSIZE*2))
> Log "DSIZE is $DSIZE"
> #OFFSET=2048
> OFFSET=8
> SWAP=1000000
> BOOT=600000
> PSIZE=$(((DSIZE-(OFFSET+BOOT+SWAP+10))/2))
> PSIZE=$((PSIZE+(PSIZE%2)))
> PSTART=$((PSIZE+BOOT+SWAP+OFFSET))
> Log "PSIZE is $PSIZE"
> Log "PSTART is $PSTART"
> # partition the disk for /boot, swap, /
> #/sbin/sfdisk -q -uS $DRIVE << EOF
> #8,600000,L,*
> #,1000000,S
> #,,L
> #EOF
> /sbin/sfdisk -f -q -uS $DRIVE << EOF
> $OFFSET,$BOOT,L,*
> $((OFFSET+BOOT)),$SWAP,S
> $((OFFSET+BOOT+SWAP)),$PSIZE,L
> $PSTART,,L
> EOF
>
> I am creating two linux partitions and a swap partition.
> The swap is fixed and the two linux partitions are approximately
> equal.
> I have had no problem booting C6 after doing this.
>
>
Steve,

Thanks - I will try this script probably Monday - heading out today.

Jerry
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11-14-2011, 04:16 PM

On 09/16/2011 08:37 AM, Steve Clark wrote:
> On 09/16/2011 08:10 AM, Jerry Geis wrote:
>> On 09/16/2011 06:59 AM, Steve Clark wrote:
>>> On 09/15/2011 06:03 PM, Jerry Geis wrote:
>>>>> I think the fdisk in 6 tries to align on 4k boundaries. Does fdisk -c do the
>>>>> same thing?
>>>>>
>>>> Scott - thanks I just tried -cu and same result.
>>>>
>>>> jerry
>>>>
>>>> _______________________________________________
>>>> CentOS mailing list
>>>> CentOS@centos.org
>>>> http://lists.centos.org/mailman/listinfo/centos
>>>>
>>> have you tried sfdisk?
>>>
>>>
>> Steve - I had not - but asking sfdisk to list the device on centos has
>> the wrong geometry to start
>> with just like fdisk does. it should be 255 heads and 63 sectors.
>>
>> sfdisk -v
>> sfdisk (util-linux-ng 2.17.2)
>>
>> sfdisk -l /dev/sde
>>
>> Disk /dev/sde: 1022 cylinders, 247 heads, 62 sectors/track
>> Warning: The partition table looks like it was made
>> for C/H/S=*/255/63 (instead of 1022/247/62).
>> For this listing I'll assume that geometry.
>> Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0
>>
>> Device Boot Start End #cyls #blocks Id System
>> /dev/sde1 * 0+ 974- 975- 7830616+ b W95 FAT32
>> end: (c,h,s) expected (974,221,63) found (1023,254,63)
>> /dev/sde2 0 - 0 0 0 Empty
>> /dev/sde3 0 - 0 0 0 Empty
>> /dev/sde4 0 - 0 0 0 Empty
>>
>>
>> ----------------
>> This is centos 5
>> sfdisk -v
>> sfdisk (util-linux 2.13-pre7)
>>
>> sfdisk -l /dev/sdb
>>
>> Disk /dev/sdb: 974 cylinders, 255 heads, 63 sectors/track
>> Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0
>>
>> Device Boot Start End #cyls #blocks Id System
>> /dev/sdb1 * 0+ 851 852- 6843658+ 83 Linux
>> /dev/sdb2 852 973 122 979965 82 Linux swap / Solaris
>> /dev/sdb3 0 - 0 0 0 Empty
>> /dev/sdb4 0 - 0 0 0 Empty
>>
>>
> Hmm...
> I have an automated script that installs C6 on devices - I have used
> it on sata drives, ssds and
> CF. The first thing I do is dd of=$DRIVE if=/dev/zero bs=1024 count=1
> to wipe out the existing
> partition table then I do
>
> # 1MB = 2048 512byte sectors
> DSIZE=`sfdisk -s -uS $DRIVE`
> DSIZE=$((DSIZE*2))
> Log "DSIZE is $DSIZE"
> #OFFSET=2048
> OFFSET=8
> SWAP=1000000
> BOOT=600000
> PSIZE=$(((DSIZE-(OFFSET+BOOT+SWAP+10))/2))
> PSIZE=$((PSIZE+(PSIZE%2)))
> PSTART=$((PSIZE+BOOT+SWAP+OFFSET))
> Log "PSIZE is $PSIZE"
> Log "PSTART is $PSTART"
> # partition the disk for /boot, swap, /
> #/sbin/sfdisk -q -uS $DRIVE << EOF
> #8,600000,L,*
> #,1000000,S
> #,,L
> #EOF
> /sbin/sfdisk -f -q -uS $DRIVE << EOF
> $OFFSET,$BOOT,L,*
> $((OFFSET+BOOT)),$SWAP,S
> $((OFFSET+BOOT+SWAP)),$PSIZE,L
> $PSTART,,L
> EOF
>
> I am creating two linux partitions and a swap partition.
> The swap is fixed and the two linux partitions are approximately
> equal.
> I have had no problem booting C6 after doing this.
>
>
> --
> Stephen Clark
> *NetWolves*
> Sr. Software Engineer III
> Phone: 813-579-3200
> Fax: 813-882-0209
> Email: steve.clark@netwolves.com
> http://www.netwolves.com

Just now getting back to this ....

I found that adding the parameter "-I 128" to my mke2fs command
makes my CF card programming procedure work with CentOS 6 where
previously it only worked under CentOS 5.

Thanks,

Jerry
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