Quote:
Originally Posted by mweed
Assuming that 900G disk is to be ignored the only way this can happen is if sdb1 is of type LVM and part of VolGroup00.
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Good guess, mweed. Spot on! The CentOS was probably installed with the two arrays in place, in which case that would have been the default.
ytd, you need to learn about lvm and how to work it before you go any further.
You are quite lucky that you didn't hose the whole volume group when you started messing about. What you are asking (and the way your machine is configured) makes little sense.
With logical volume management, when you run short of space you can can install more physical disks, initialise them as physical volumes, add them to the relevant volume group, and include them as you want into the logical volumes. Then you resize the file system to match the new size of the volume.
If you actually want to remove a drive, you need to use lvm commands to move the data off that drive first.
However, all of this requires a level of knowledge about basics like filesystems and partitioning that you clearly don't yet have and I would advise against using a machine that has 'uber' data on it to learn with.