LinuxQuestions.org - A valid Partition Table

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A valid Partition Table

I'm runing Rhel 5.2 and I created a disk as following:

A. pvcreate /dev/cciss/c0d1
B. vgcreate /dev/vg01 /dev/cciss/c0d1
C. lvcreate –L 5000 –nlvol1 /dev/vg01 /dev/cciss/c0d1
D. mke2fs –j /dev/vg01/lvol1
E. Now create directory… mkdir /tmp99_mnt
F. Now vi /etc/fstab and add the following entry:
/dev/vg01/lvol9 /tmp99_mnt ext3 defaults 1 2

So I was bale to munt it and now as soon as I run "fdisk -l"
it says I do not have a valid partition table. So what do that mean and how what I need to do to ensure that I will not have any problem later.

i suspect because the PV metadata is written on the block device (c0d1) where the partition table would reside rather than creating a partition (c0d1p1) and pvcreate on it. I could be mistaken since i'm not familiar with cciss and am making an assumption based on the name.

:study:

How would I created the partition c0d0p1 first? If you have another disk and need to created it as a physical volume, then create a vollume group and the add a logical volume group and a file system to it what are the stpes you would do?

Code:

fdisk /dev/cciss/c0d1

  n

  p

  1

  <enter> for default first cylinder

  <enter> for default last cylinder

  t

  8e

  w



pvcreate /dev/cciss/c0d1p1

vgcreate /dev/vg01 /dev/cciss/c0d1p1

lvcreate –l 100%VG –n lvol1 /dev/vg01 

mke2fs –j /dev/vg01/lvol1

here is an example from one of my boxes (not cciss, which is why i'm not certain on the naming of partitions for the device).
sdc is pvcreate directly on block device
sdd has pvcreate run on first partition

Code:

[root@example ~]# fdisk -l /dev/sd[cd]                



Disk /dev/sdc: 1073 MB, 1073742336 bytes

34 heads, 61 sectors/track, 1011 cylinders

Units = cylinders of 2074 * 512 = 1061888 bytes



  Device Boot      Start        End      Blocks  Id  System



Disk /dev/sdd: 1073 MB, 1073742336 bytes

34 heads, 61 sectors/track, 1011 cylinders

Units = cylinders of 2074 * 512 = 1061888 bytes



  Device Boot      Start        End      Blocks  Id  System

[root@example ~]# fdisk /dev/sdd 



Command (m for help): n

Command action        

  e  extended        

  p  primary partition (1-4)

p                            

Partition number (1-4): 1    

First cylinder (1-1011, default 1): 

Using default value 1              

Last cylinder or +size or +sizeM or +sizeK (1-1011, default 1011): 

Using default value 1011



Command (m for help): t

Selected partition 1

Hex code (type L to list codes): 8e

Changed system type of partition 1 to 8e (Linux LVM)



Command (m for help): w

The partition table has been altered!



Calling ioctl() to re-read partition table.

Syncing disks.

[root@example ~]# pvcreate /dev/sdc /dev/sdd1

  Physical volume "/dev/sdc" successfully created

  Physical volume "/dev/sdd1" successfully created

[root@example ~]# fdisk -l /dev/sd[cd]



Disk /dev/sdc: 1073 MB, 1073742336 bytes

34 heads, 61 sectors/track, 1011 cylinders

Units = cylinders of 2074 * 512 = 1061888 bytes



Disk /dev/sdc doesn't contain a valid partition table



Disk /dev/sdd: 1073 MB, 1073742336 bytes

34 heads, 61 sectors/track, 1011 cylinders

Units = cylinders of 2074 * 512 = 1061888 bytes



  Device Boot      Start        End      Blocks  Id  System

/dev/sdd1              1        1011    1048376+  8e  Linux LVM

[root@example ~]#

hope this clears it up.
:study:

I wonder how /dev/cciss/c0d1 sort of disk naming convention(solaris-type) comes under Rhel.

cciss is the module for HP Smart Array Controllers