I am running out of space on my root partition and would like to steal some from a different partition. The drives are 2x120GB with mdadm software RAID. I am using CentOS 6.5 64-bit. I used the centos installer guided RAID setup. It seems like most of the HowTos are gearing me towards not having the underlying partitions. So others would have just /dev/md0. They would perform a resize2fs /dev/md0 25G (reducing from 50G for example) and then use mdadm to resize it, etc.
The layout is:
Filesystem Size Used Avail Use% Mounted on /dev/md0p5 9.7G 7.1G 2.1G 78% / tmpfs 16G 0 16G 0% /dev/shm /dev/md0p1 194M 99M 86M 54% /boot /dev/md0p2 68G 7.2G 57G 12% /var/www
cat /proc/mdstat:
Personalities : [raid1] md0 : active raid1 sdb[1] sda[0] 117220736 blocks [2/2] [UU] unused devices:
Here is the fdisk:
fdisk -l Disk /dev/sda: 120.0 GB, 120034123776 bytes 255 heads, 63 sectors/track, 14593 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00035afc Device Boot Start End Blocks Id System /dev/sda1 * 1 26 204800 83 Linux Partition 1 does not end on cylinder boundary. /dev/sda2 26 8950 71680000 83 Linux /dev/sda3 8950 11039 16777216 82 Linux swap / Solaris /dev/sda4 11039 14594 28557312 5 Extended /dev/sda5 11039 12314 10240000 83 Linux Disk /dev/sdb: 120.0 GB, 120034123776 bytes 255 heads, 63 sectors/track, 14593 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00035afc Device Boot Start End Blocks Id System /dev/sdb1 * 1 26 204800 83 Linux Partition 1 does not end on cylinder boundary. /dev/sdb2 26 8950 71680000 83 Linux /dev/sdb3 8950 11039 16777216 82 Linux swap / Solaris /dev/sdb4 11039 14594 28557312 5 Extended /dev/sdb5 11039 12314 10240000 83 Linux Disk /dev/md0: 120.0 GB, 120034033664 bytes 2 heads, 4 sectors/track, 29305184 cylinders Units = cylinders of 8 * 512 = 4096 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00035afc Device Boot Start End Blocks Id System /dev/md0p1 * 257 51456 204800 83 Linux Partition 1 does not end on cylinder boundary. /dev/md0p2 51457 17971456 71680000 83 Linux Partition 2 does not end on cylinder boundary. /dev/md0p3 17971457 22165760 16777216 82 Linux swap / Solaris Partition 3 does not end on cylinder boundary. /dev/md0p4 22165761 29305088 28557312 5 Extended Partition 4 does not end on cylinder boundary. /dev/md0p5 22166273 24726272 10240000 83 Linux
So what can I do to grow the root partition and shrink the /var/www partition?