I have lost the web page with the steps to do an extension of an LVM
into unused disk space. Let me explain my situation and ask my
question.
I have a server with Red Hat Enterprise Linux 5. It had two 250GB
hard drives in a hardware RAID 1 mirror. Working fine. We needed
more space, so here is what I did:
- Bought two identical model and recommended 1TB drives from Dell.
(It's a Dell server.)
- Using the RAID control interface, I took one 250GB drive offline.
- Shutdown the server and removed the 250GB drive.
- Installed one of the new 1TB drives in place of the 250GB drive just removed.
- Powered up the RAID controller BIOS interface and commanded a
rebuild of the mirror from the remaining 250GB drive to the 1TB drive.
- Booted the system and everything was working.
- Shutdown the system and removed the second 250GB drive, replacing it
with the other 1TB drive.
- Again used the RAID controller BIOS interface to rebuild the mirror
from the first 1TB drive to the second one.
- Booted the system and all is working well!
Except...
Now the partition table of the mirrored 1TB drives still only has
partitions to use up to the old 250GBs. I need to:
1 - Update the partition table to expand the last partition into the
unused 750GB of space. (parted?)
2 - Expand the one or more logical volumes into the new space (lvextend)
3 - Expand the file system(s) into the new space (resize2fs)
I plan to expand /dev/sda5 into the empty space. It is the last
partition defined and so the least risky to expand, in my mind. Here
is the fdisk output:
# fdisk -l
Disk /dev/sda: 248.9 GB, 248999051264 bytes
255 heads, 63 sectors/track, 30272 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sda1 1 7 56196 de Dell Utility
/dev/sda2 8 1052 8393962+ 8e Linux LVM
/dev/sda3 * 1053 1077 200812+ 83 Linux
/dev/sda4 1078 30272 234508837+ 5 Extended
/dev/sda5 1078 30272 234508806 8e Linux LVM
#
Question
I am extending into empty space on currently installed drives. The
instructions I can find online all seem to assume a new physical drive
has been added and don't go into the partition issues on step 1 of my
outline above. All the utilities and commands that produce LVM
information do not show the vast, unpartitioned space out there. So,
I assume step 1 is needed to open up the unallocated space into one of
the partitions.
Am I on the right track, to use "parted" and expand the partition
definition before expanding a logical volume? Or am I missing
something or making something more difficult?
Alan
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