On Fri, Jul 20, 2001 at 04:34:15PM +0300, moka hol gr wrote: > > Hi there, new to LVM, so I would appreciate if you can > point me to answers to these questions: > > 1) I have a system with 3 hard disks, and only one of > them is presently used. This contains boot, root and > swap plus a logical partition(not LVM) containing > /var and /home. > > I have big database tables, so I would like > to create one volume group consisting of the 2 > unused disks plus the /var. Is this possible > without losing what is in /var? > 2) The reason I need a lot of space is that mysql > which I am using stores the database tables in /var. > Can I somehow "name" the volume group /var > so that mysql will not be confused? I would use pvcreate on your two disks, then vgcreate to bind them together in a volume group. A volume group is like a virtual disk drive. You have to 'partition' it. This is what creating a 'logical' volume us. lvcreate is used for tihs. You can create a logical volume named whatever you want, but that name has nothing to do with where it's mounted. Now, supposing you created a volume group called 'MyOnlyVG' and created a logical volume on it called 'LVMvar', you now need to do a mkfs on that logical volume. mkfs /dev/MyOnlyVG/LVMvar After you do this, you should move the contents of /var to your new filesystem. mount /dev/MyOnlyVG/LVMvar /mnt/tmp cp -ax /var /mnt/tmp Now, you can try using your new logical volume as '/var'. I think you can do this by going to single user mode then doing: unmount /var mount /dev/MyOnlyVG/LVMvar /var init 3 # Goes back to multi-user mode. init 5 for graphical login If everything seems to work fine, your new var should be OK. Now you can run pvcreate on your old /var device, run vgextend to add it to the MyOnlyVG volume group, lvextend to resize the /dev/MyOnlyVG/LVMvar logical volume/virtual partition, and a file system resize utility to modifiy the size of the /var filesystem. Have fun (if at all possible), -- "It does me no injury for my neighbor to say there are twenty gods or no God. It neither picks my pocket nor breaks my leg." --- Thomas Jefferson "Go to Heaven for the climate, Hell for the company." -- Mark Twain -- Eric Hopper (hopper omnifarious org http://www.omnifarious.org/~hopper) --
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