EXT3 online resize
Introduction of an additional drive into a RAID array to expand capacity requires additional steps in the OS to expand the partition without data loss.
First, fdisk the device and delete the “EXTENDED” partition that you are looking to resize, in this instance partition 4.
[root@app1 ~]# fdisk /dev/sda The number of cylinders for this disk is set to 53309. There is nothing wrong with that, but this is larger than 1024, and could in certain setups cause problems with: 1) software that runs at boot time (e.g., old versions of LILO) 2) booting and partitioning software from other OSs (e.g., DOS FDISK, OS/2 FDISK) Command (m for help): p Disk /dev/sda: 438.4 GB, 438489317376 bytes 255 heads, 63 sectors/track, 53309 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sda1 * 1 13 104391 83 Linux /dev/sda2 14 274 2096482+ 83 Linux /dev/sda3 275 405 1052257+ 82 Linux swap /dev/sda4 406 35539 282213855 5 Extended /dev/sda5 406 35539 282213823+ 83 Linux Command (m for help): d Partition number (1-5): 4 Command (m for help): p Disk /dev/sda: 438.4 GB, 438489317376 bytes 255 heads, 63 sectors/track, 53309 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sda1 * 1 13 104391 83 Linux /dev/sda2 14 274 2096482+ 83 Linux /dev/sda3 275 405 1052257+ 82 Linux swapOnce this has been removed the partition should be re-created as extended, then a primary partition introduced
Command (m for help): n Command action e extended p primary partition (1-4) e Selected partition 4 First cylinder (406-53309, default 406): Using default value 406 Last cylinder or +size or +sizeM or +sizeK (406-53309, default 53309): Using default value 53309 Command (m for help): p Disk /dev/sda: 438.4 GB, 438489317376 bytes 255 heads, 63 sectors/track, 53309 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sda1 * 1 13 104391 83 Linux /dev/sda2 14 274 2096482+ 83 Linux /dev/sda3 275 405 1052257+ 82 Linux swap /dev/sda4 406 53309 424951380 5 ExtendedNow introduce a primary partition on the extended NOTICE- The cylinder in use of the removed partition should be noted as the subsequent introduction of the new partition will require this detail in order to preserve the data
Command (m for help): n First cylinder (406-53309, default 406): Using default value 406 Last cylinder or +size or +sizeM or +sizeK (406-53309, default 53309): Using default value 53309 Command (m for help): p Disk /dev/sda: 438.4 GB, 438489317376 bytes 255 heads, 63 sectors/track, 53309 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sda1 * 1 13 104391 83 Linux /dev/sda2 14 274 2096482+ 83 Linux /dev/sda3 275 405 1052257+ 82 Linux swap /dev/sda4 406 53309 424951380 5 Extended /dev/sda5 406 53309 424951348+ 83 Linuxwrite the changes and exit
Command (m for help): w The partition table has been altered! Calling ioctl() to re-read partition table. WARNING: Re-reading the partition table failed with error 16: Device or resource busy. The kernel still uses the old table. The new table will be used at the next reboot. Syncing disks.A reboot of the system is required. The final step is ‘ext2online’ of ’/’
[root@app1 ~]# ext2online / ext2online v1.1.18 - 2001/03/18 for EXT2FS 0.5bPartition expanded from this:
[root@app1 ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/sda5 265G 256G 9.9G 97% / /dev/sda1 99M 12M 82M 13% /boot none 2.0G 0 2.0G 0% /dev/shm /dev/sda2 2.0G 53M 1.9G 3% /tmpto this
[root@app1 ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/sda5 399G 227G 173G 57% / /dev/sda1 99M 12M 82M 13% /boot none 2.0G 0 2.0G 0% /dev/shm /dev/sda2 2.0G 52M 1.9G 3% /tmp