[Cialug] Trying to label 2TB USB drive from Redhat 5.7

[John Lengeling]

I manually created the devices using the major/minor numbers:

sh-3.2# mknod /dev/sdd b 8 48
sh-3.2# mknod /dev/sdd1 b 8 49

Now fdisk -l works:

sh-3.2# /sbin/fdisk -l

Disk /dev/sda: 300.0 GB, 300000000000 bytes
255 heads, 63 sectors/track, 36472 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          13      104391   83  Linux
/dev/sda2              14       36472   292856917+  8e  Linux LVM

Disk /dev/sdd: 2000.3 GB, 2000398929920 bytes
255 heads, 63 sectors/track, 243201 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sdd1   *          13      243202  1953410048    7  HPFS/NTFS

Works now!   Was able to relabel the drive.   Still don't know why udev
didn't create the device entries in the first place.  Thanks Tom for the
/proc/partitions as I was trying to figure out how to track down the
major/minor numbers needed for mknod.

j


On Fri, Mar 21, 2014 at 10:32 AM, John Lengeling
<john.lengeling at gmail.com>wrote:

> > What type of disklabel is the drive using?
>
> No clue.  Can't access the drive to read the label using Linux tools.  It
> is a brand new drive so my guess it is GPT or MBR with NTFS partition.
> The kernel says the device is "sdd1" yet /dev/sdd and /dev/sdd1 do not
> exist for me to run fdisk or parted.
>
> > What does the output of the following:
> > ls -l /dev/sg*
> > cat /proc/partitions
> > fdisk -l
>
> Here you go:
>
> sh-3.2# ls -l /dev/sg*
> crw------- 1 root root 21, 0 Jan 20  2013 /dev/sg0
> crw------- 1 root root 21, 1 Jan 20  2013 /dev/sg1
> crw------- 1 root root 21, 2 Jan 20  2013 /dev/sg2
> crw------- 1 root root 21, 3 Jan 20  2013 /dev/sg3
>
> sh-3.2# cat /proc/partitions
> major minor  #blocks  name
>
>    8     0  292968750 sda
>    8     1     104391 sda1
>    8     2  292856917 sda2
>  253     0  282624000 dm-0
>  253     1   10223616 dm-1
>    8    48 1953514580 sdd
>    8    49 1953410048 sdd1
>
> sh-3.2# /sbin/fdisk -l
>
> Disk /dev/sda: 300.0 GB, 300000000000 bytes
> 255 heads, 63 sectors/track, 36472 cylinders
> Units = cylinders of 16065 * 512 = 8225280 bytes
>
>    Device Boot      Start         End      Blocks   Id  System
> /dev/sda1   *           1          13      104391   83  Linux
> /dev/sda2              14       36472   292856917+  8e  Linux LVM
> sh-3.2#
>
>
>
> I see the major/minor device numbers for sdd and sdd1...I guess I can try
> to just mknod the devices.  Will give that a try...
>
> j
>
>
> On Thu, Mar 20, 2014 at 7:09 PM, Tom Pohl <tom at tcpconsulting.com> wrote:
>
>> What does the output of the following:
>> ls -l /dev/sg*
>> cat /proc/partitions
>> fdisk -l
>>
>> -Tom
>>
>>
>> > On Mar 20, 2014, at 5:25 PM, John Lengeling <john.lengeling at gmail.com>
>> wrote:
>> >
>> > Trying access and label a 2TB portable USB drive under Redhat 5.7.
>> >
>> > Normally this just "works" but in this case, the kernel says it is
>> going to
>> > use sdd1, but none of the device entries exists.
>> >
>> > Output from dmesg:
>> >
>> > usb 2-1.1: new high speed USB device using ehci_hcd and address 9
>> > usb 2-1.1: configuration #1 chosen from 1 choice
>> > scsi25 : SCSI emulation for USB Mass Storage devices
>> > usb-storage: device found at 9
>> > usb-storage: waiting for device to settle before scanning
>> >  Vendor: TOSHIBA   Model: External USB 3.0  Rev: 0201
>> >  Type:   Direct-Access                      ANSI SCSI revision: 06
>> > SCSI device sdd: 3907029160 512-byte hdwr sectors (2000399 MB)
>> > sdd: Write Protect is off
>> > sdd: Mode Sense: 2b 00 00 00
>> > sdd: assuming drive cache: write through
>> > SCSI device sdd: 3907029160 512-byte hdwr sectors (2000399 MB)
>> > sdd: Write Protect is off
>> > sdd: Mode Sense: 2b 00 00 00
>> > sdd: assuming drive cache: write through
>> > sdd: sdd1
>> > sd 25:0:0:0: Attached scsi disk sdd
>> > sd 25:0:0:0: Attached scsi generic sg4 type 0
>> >
>> > /dev entries:
>> >
>> > sh-3.2# ls -l /dev/sd*
>> > brw-r----- 1 root disk 8,  0 Jan 20  2013 /dev/sda
>> > brw-r----- 1 root disk 8,  1 Jan 20  2013 /dev/sda1
>> > brw-r----- 1 root disk 8,  2 Jan 20  2013 /dev/sda2
>> > brw-r----- 1 root disk 8, 16 Jan 20  2013 /dev/sdb
>> > brw-r----- 1 root disk 8, 32 Jan 20  2013 /dev/sdc
>> >
>> > So why isn't udev creating the device entries?
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