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How to create LVM in CentOS?
I am not sure how to create LVM for CentOS as specified in the instructions
/ 80GB+ (KVM templates & iso's will be stored in /home/solusvm/kvm)
SWAP 4GB+ (Virtual servers may use host swap if there is a real memory shortage)
Logical Volume Group (LVM) remaining space (Logical Volume Group Only, SolusVM will create the logical volumes for
the virtual servers inside this group)
Please Note: The PE Size should be set to 32M not the Default of 4M.
My disk partition is
[root@localhost ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 890G 1.9G 842G 1% /
/dev/sda1 99M 18M 76M 20% /boot
tmpfs 5.8G 0 5.8G 0% /dev/shm
How do I create the LVM described in the instructions above, anyone?
Comments
You'll need to create the LVM when the OS is installed or from an empty partition. Resizing your current partition will be harder to do unless you boot to GParted or a similar disk editor.
You can't.
The LVM has to be setup from the get go when the box is provisioned. Do you have a KVM to reinstall?
Awww, shucks. I need to get that going from the start again (OS reload).
I thought there may be a shortcut to do that from within the OS
You can but it requires an empty partition. Redhat's wiki has a nice section on LVMs including creating one in the OS.
The whole partition layout is a bit different if you like to use LVM.
You can try to shrink the sda3 partition and add a new partition marked with type lvm, but this would require a boot with something like systemrescuecd and a bit of knowledge. If this is not the case, then a new fresh install with LVM should be the best path :-)
I dont have access to KVM over IP with this dedi provider and it costs
OS reloads are free so im opting for an OS-reload with the specific partition instructions
By the way, how to increase PE size to 32M and not the default 4M?
I got one note that says use this, hope its correct
When you put in the request for the OS reload ask them to create an LVM and set the extent size to 32MB. It's much easier to do when installing the OS.
fdisk /dev/sdb -> select 8e (LVM) and create sdb1
pvcreate sdb1
pvdisplay
vgcreate vg1 /dev/sdb1
vgdisplay
lvcreate -n lvm -L100G vg1
lvdisplay
mkfs.ext3 /dev/vg1/lvm
mount /dev/vg1/lvm /mnt
also you can use webmin to create, it's more simple with interface
@asim do you have other disk(s) or free space on the /dev/sda disk? if not you need definitively to have to shrink the sda3 partition.
By the way, how to increase PE size to 32M and not the default 4M?
i prefer for / = 80-100GB
swap = max 4GB
/forvg = rest of the free space.
and after that you can remove/unmount the forvg and create with pvcreate and vgcreate.
it's hard increasing the 4M PE Size to 32M. in normal way you only can get 8M.
@Mon5t3r my dedi provider has been kind enough to give me the free KVMoverIP and i have easily done that via CentOS GUI installer (even the PE size)
Thanks everyone for your comments
You're welcome