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Special Forums Hardware Filesystems, Disks and Memory Udev label removes corresponding fdisk, sfdisk or lsvdev entry Post 302294949 by Radar on Friday 6th of March 2009 07:45:54 AM
Old 03-06-2009
Quote:
Originally Posted by otheus
I cannot give you a 100% certainty that this will not fail, but I'm 98% certain that the scsi_id is unique and will always return the correct result and will faithfully identify the disk, even if the disks are move or renumbered.
You are correct. That's the method I use to verify that that block device is indeed still there, but just being referenced by the new label.

Interestingly, /proc/partitions will always show those six missing devices that udev labels, but reading from them via dd by that sd device name will fail.
 

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FDISK(8)						      System Manager's Manual							  FDISK(8)

NAME
fdisk - partition a hard disk [IBM] SYNOPSIS
fdisk [-hm] [-sn] [file] OPTIONS
-h Number of disk heads is m -s Number of sectors per track is n EXAMPLES
fdisk /dev/hd0 # Examine disk partitions fdisk -h9 /dev/hd0 # Examine disk with 9 heads DESCRIPTION
When fdisk starts up, it reads in the partition table and displays it. It then presents a menu to allow the user to modify partitions, store the partition table on a file, or load it from a file. Partitions can be marked as MINIX, DOS or other, as well as active or not. Using fdisk is self-explanatory. However, be aware that repartitioning a disk will cause information on it to be lost. Rebooting the sys- tem immediately is mandatory after changing partition sizes and parameters. MINIX, XENIX, PC-IX, and MS-DOS all have different partition numbering schemes. Thus when using multiple systems on the same disk, be careful. Note that MINIX, unlike MS-DOS , cannot access the last sector in a partition with an odd number of sectors. The reason that odd partition sizes do not cause a problem with MS-DOS is that MS-DOS allocates disk space in units of 512-byte sectors, whereas MINIX uses 1K blocks. Fdisk has a variety of other features that can be seen by typing h. Fdisk normally knows the geometry of the device by asking the driver. You can use the -h and -s options to override the numbers found. SEE ALSO
part(8). FDISK(8)
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