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LVM & device not found

phasevar
phasevar asked
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Last Modified: 2013-12-15
I have an extra hard disk in my server that was formatted with extfs3 and mounted in the filesystem.  The drive has nothing on it and I'm not learning about setting up LVM partitions.  So I unmounted the partition /dev/sda1 and ran the command "pvcreate /dev/sda" but it tells me "Device /dev/sda not found".  Can't I just put the whole drive under LVM instead of just a partition?

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>>Can't I just put the whole drive under LVM instead of just a partition?<<
yes you can,
but first you have to know that using LVM assumes that the disk or disks you will be using do not have a formatted partition. In Linux you would use the fdisk to remove the partition, note that this thing will remove all the data, in your case there is nothing to lose your HD is empty and you dont use it at all.

next to use the whole disk in LVM, you can do this command :
# dd if=/dev/zero of=/dev/sda bs=1K count=1
see /dev/sda --> its your HD, be sure its the HD that you want to use, the above command will erase the partition table by zeroing the fist sector.
then type this command :
# blockdev --rereadpt /dev/sda
this will call block device ioctls with reread partition table for your /dev/sda HD

now as i think every thing is ok you can run the command :
# pvcreate /dev/sda
now should be no problem so you can continue by vgcreate, lvcreate ...

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