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hd partitions mounts
Info in this page applies to the servers tcblsso and tcblsso2, NOT tcblsso3! tcblsso3 has a disk large enough to contain the OS and the data.
Due to extension of disk capacity, there is a non-standard partition layout. We started from a disk with capacity of ± 39GB that was later extended with an extra 216GB.
Here we document how to go from this situation to a situation where the rest of the disk space is mounted to a folder /srv/opt.
All commands described here are run with root permissions.
1 Start cfdisk on /dev/sda, since this is the device holding the extra space.
cfdisk /dev/sda
The layout looks like this:
Disk: /dev/sda
Size: 256 GiB, 274877906944 bytes, 536870912 sectors
Label: dos, identifier: 0x6b48698f
Device Boot Start End Sectors Size Id Type
>> /dev/sda1 * 2048 81788927 81786880 39G 83 Linux
/dev/sda2 81790974 83884031 2093058 1022M 5 Extended
└─/dev/sda5 81790976 83884031 2093056 1022M 82 Linux swap / Solar
Free space 83884032 536870911 452986880 216G
┌─────────────────────────────────────────────────────────────────────────────────────────────┐
│ Partition type: Linux (83) │
│ Attributes: 80 │
│ Filesystem: ext4 │
│Filesystem UUID: f7af2c0e-a090-468c-9378-16346e59d515 │
│ Mountpoint: / (mounted) │
└─────────────────────────────────────────────────────────────────────────────────────────────┘
[Bootable] [ Delete ] [ Quit ] [ Type ] [ Help ] [ Write ] [ Dump ]
2 Create a new partition from Free space (select the free space and press [ New ]:
Disk: /dev/sda
Size: 256 GiB, 274877906944 bytes, 536870912 sectors
Label: dos, identifier: 0x6b48698f
Device Boot Start End Sectors Size Id Type
/dev/sda1 * 2048 81788927 81786880 39G 83 Linux
/dev/sda2 81790974 83884031 2093058 1022M 5 Extended
└─/dev/sda5 81790976 83884031 2093056 1022M 82 Linux swap / Solar
>> Free space 83884032 536870911 452986880 216G
[ New ] [ Quit ] [ Help ] [ Write ] [ Dump ]
3 Answer a few questions in the interface:
Partition size: 216G
Partition type: Linux (83) (don't press enter!)
4 Now you get an overview of the new situation. Press [ Write ].
Disk: /dev/sda
Size: 256 GiB, 274877906944 bytes, 536870912 sectors
Label: dos, identifier: 0x6b48698f
Device Boot Start End Sectors Size Id Type
/dev/sda1 * 2048 81788927 81786880 39G 83 Linux
/dev/sda2 81790974 83884031 2093058 1022M 5 Extended
└─/dev/sda5 81790976 83884031 2093056 1022M 82 Linux swap / Solar
>> /dev/sda3 83884032 536870911 452986880 216G 83 Linux
┌─────────────────────────────────────────────────────────────────────────────────────────────┐
│Partition type: Linux (83) │
└─────────────────────────────────────────────────────────────────────────────────────────────┘
[Bootable] [ Delete ] [ Quit ] [ Type ] [ Help ] [ Write ] [ Dump ]
Write partition table to disk (this might destroy data)
Of course you are sure (type "yes"), in case this is asked. And also are you really really sure.
You should see a message at the bottom:
The partition table has been altered.
5 Now quit. You should see:
Syncing disks.
6 Reboot (in order to effectively be able to use the partition).
reboot
7 Format the partition:
mkfs.ext4 /dev/sda3
Output:
mke2fs 1.42.13 (17-May-2015)
Creating filesystem with 56623104 4k blocks and 14183424 inodes
Filesystem UUID: ac8c386e-f0ee-43e8-9383-22ace68de7dd
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
4096000, 7962624, 11239424, 20480000, 23887872
Allocating group tables: done
Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done
The new partition will be mounted on /srv (already in the directory tree).
1 Before being able to mount, we need the UUID of the new formatted partition. We can see this with cfdisk:
cfdisk /dev/sda
Select the last partition /dev/sda3 and the UUID appears at the bottom:
Disk: /dev/sda
Size: 256 GiB, 274877906944 bytes, 536870912 sectors
Label: dos, identifier: 0x6b48698f
Device Boot Start End Sectors Size Id Type
/dev/sda1 * 2048 81788927 81786880 39G 83 Linux
/dev/sda2 81790974 83884031 2093058 1022M 5 Extended
└─/dev/sda5 81790976 83884031 2093056 1022M 82 Linux swap / Solaris
>> /dev/sda3 83884032 536870911 452986880 216G 83 Linux
┌────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
│ Partition type: Linux (83) │
│ Filesystem: ext4 │
│Filesystem UUID: ac8c386e-f0ee-43e8-9383-22ace68de7dd │
└────────────────────────────────────────────────────────────────────────────────────────────────────────────┘
[Bootable] [ Delete ] [ Quit ] [ Type ] [ Help ] [ Write ] [ Dump ]
Copy the UUID value and then select Quit.
2 Open /etc/fstab in your favourite editor, so that it looks like this (last 2 lines are added; use the copied UUID value):
# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
#
# <file system> <mount point> <type> <options> <dump> <pass>
# / was on /dev/sda1 during installation
UUID=f7af2c0e-a090-468c-9378-16346e59d515 / ext4 errors=remount-ro 0 1
# swap was on /dev/sda5 during installation
UUID=42432368-4968-4c4f-abb3-f0a0c6a0bce5 none swap sw 0 0
/dev/fd0 /media/floppy0 auto rw,user,noauto,exec,utf8 0 0
# new partition, added after installation
UUID=ac8c386e-f0ee-43e8-9383-22ace68de7dd /srv ext4 errors=remount-ro 0 2
3 Mount the new partition:
mount /srv
On future reboots the partition will be mounted automatically.