[linux-lvm] LVM-0.9 Touble in pvcreate

Soete Joel joel.soete at freebel.net
Fri Dec 29 17:23:08 UTC 2000

Hello LVM - guy,

Being an system engineer who appreciate the facilities of managment
which brings LVM into HPUX systems, I try to test your last

But I loose Linux-2.4.0-test10 also I spend time to include youe patches
into Linux-2.4.0-test12.
I submitted to your relivant opignon as I am not sure of the result. I
compile a kernel with LVM modular options and seems to work but not yet

I am working on a 'potato Debian distribution (2.2_r0)'.
And I would like to submit you some test results which are strange:

I first create two disk partition of 10Mb [actualy 8.23Mb] (hda24,
hda25) with cfdisk. And the result was:
                                  cfdisk 2.10f

                              Disk Drive: /dev/hda
                            Size: 15020457984 bytes
              Heads: 255   Sectors per Track: 63   Cylinders: 1826

    Name        Flags      Part Type  FS Type          [Label]
Size (MB)

    hda16                   Logical   Linux
ext2                          65.81
    hda17                   Logical   Linux
ext2                          16.46
    hda18                   Logical   Linux
ext2                          65.81
    hda19                   Logical   Linux
ext2                          16.46
    hda20                   Logical   Linux ext2
    hda21                   Logical   Linux ext2
    hda22                   Logical   Linux ext2
    hda23                   Logical   Linux ext2
                            Logical   Free Space
    hda24                   Logical
Linux                                8.23
    hda25                   Logical
Linux                                8.23

Then I create pseudo devices:
% mknod /dev/hda24 b 3 24
% mknod /dev/hda25 b 3 25

% ls /dev/hda24 /dev/hda25
brw-r--r--    1 root     root       3,  24 Dec 29 14:51 /dev/hda24
brw-r--r--    1 root     root       3,  25 Dec 29 14:51 /dev/hda25


Reboot (I do not yet find another way to make know the new partions to
the kernel)

Now following LVM-HOWTO (corresponding to HP experience excepted that HP
consider only an all disk):
% pvcreate /dev/hda24

But what is my surprise with a partition of about 8Mb pvcreate a
phisycal volume of 62Mb???

% pvdisplay /dev/hda24

pvdisplay -- getting physical volume size
--- Physical volume ---
PV Name               /dev/hda24
VG Name               test_vg
PV Size               62.72 MB / NOT usable 2.72 MB [LVM: 121 KB]
PV#                   1
PV Status             available
Allocatable           yes
Cur LV                1
PE Size (KByte)       4096
Total PE              15
Free PE               13
Allocated PE          2
PV UUID               MB5eIp-jxvc-4pup-ncSM-O6xT-fMmu-JjYgzM

What do I wrong?

Thanks in adavance for help,

PS: I countinue the rest of the test as follow and all seems coherent
with those result:

% vgcreate test_vg /dev/hda24

% vgdisplay test_vg
--- Volume group ---
VG Name               test_vg
VG Access             read/write
VG Status             available/resizable
VG #                  0
MAX LV                256
Cur LV                1
Open LV               1
MAX LV Size           255.99 GB
Max PV                256
Cur PV                1
Act PV                1
VG Size               60 MB
PE Size               4 MB
Total PE              15
Alloc PE / Size       2 / 8 MB
Free  PE / Size       13 / 52 MB
VG UUID               CBKdMh-Nk1S-Z4l0-qldN-r3Jq-gSAn-IWbqaT

% lvcreate -L5 -ntest_lv1 test_vg

% lvdisplay /dev/test_vg/test_lv1
--- Logical volume ---
LV Name                /dev/test_vg/test_lv1
VG Name                test_vg
LV Write Access        read/write
LV Status              available
LV #                   1
# open                 1
LV Size                8 MB
Current LE             2
Allocated LE           2
Allocation             next free
Read ahead sectors     120
Block device           58:0

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