A CentOS 7 server has to have LUKS encryption for everything but /boot and /boot/efi.  And the large LUKS encrypted remainder partition (1.8 TB) will then need to be partitioned further.  I was able to LUKS encrypt the required part of the hard drive during the CentOS 7 installation process, but now I am not able to create additional partitions within the large LUKS partition.  How can I create partitions within the large (1.8 TB) LUKS-encrypted partition?  Here is the actual terminal record of my attempts so far:  [root@localhost ~]# fdisk -lWARNING: fdisk GPT support is currently new, and therefore in an experimental phase. Use at your own discretion.Disk /dev/sda: 2000.4 GB, 2000398934016 bytes, 3907029168 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 4096 bytesI/O size (minimum/optimal): 4096 bytes / 4096 bytesDisk label type: gpt#         Start          End    Size  Type            Name 1         2048       411647    200M  EFI System      EFI System Partition 2       411648      1435647    500M  Microsoft basic  3      1435648    105850879   49.8G  Microsoft basic  4    105850880    121841663    7.6G  Linux swap      Disk /dev/mapper/luks-fb2eda94-fcff-4624-8b04-a9786845504a: 53.5 GB, 53458501632 bytes, 104411136 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 4096 bytesI/O size (minimum/optimal): 4096 bytes / 4096 bytesDisk /dev/mapper/luks-08f8bdb9-85bf-45ef-9519-3f38906c489a: 1938.0 GB, 1938005426176 bytes, 3785166848 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 4096 bytesI/O size (minimum/optimal): 4096 bytes / 4096 bytes[root@localhost ~]# df -T -hFilesystem     Type      Size  Used Avail Use% Mounted on/dev/dm-0      ext4       49G  1.1G   46G   3% /devtmpfs       devtmpfs  3.8G     0  3.8G   0% /devtmpfs          tmpfs     3.8G     0  3.8G   0% /dev/shmtmpfs          tmpfs     3.8G  8.7M  3.8G   1% /runtmpfs          tmpfs     3.8G     0  3.8G   0% /sys/fs/cgroup/dev/sda2      ext4      477M  110M  338M  25% /boot/dev/sda1      vfat      200M  9.8M  191M   5% /boot/efi/dev/dm-1      ext4      1.8T   77M  1.7T   1% /home[root@localhost ~]# partedGNU Parted 3.1Using /dev/sdaWelcome to GNU Parted! Type 'help' to view a list of commands.(parted) print                                                            Model: ATA WDC WD20EZRX-00D (scsi)Disk /dev/sda: 2000GBSector size (logical/physical): 512B/4096BPartition Table: gptDisk Flags: Number  Start   End     Size    File system     Name                  Flags 1      1049kB  211MB   210MB   fat16           EFI System Partition  boot 2      211MB   735MB   524MB   ext4 3      735MB   54.2GB  53.5GB 4      54.2GB  62.4GB  8187MB  linux-swap(v1) 5      62.4GB  2000GB  1938GB(parted) unit compact(parted) select /dev/dmError: Could not stat device /dev/dm - No such file or directory.Retry/Cancel? cancel                                                      (parted) select /dev/dm-1                                                 Using /dev/dm-1(parted) rm 5Error: Partition doesn't exist.(parted) print                                                            Model: Linux device-mapper (crypt) (dm)Disk /dev/dm-1: 1938GBSector size (logical/physical): 512B/4096BPartition Table: loopDisk Flags: Number  Start  End     Size    File system  Flags 1      0.00B  1938GB  1938GB  ext4(parted) quit                                                             [root@localhost ~]# partedGNU Parted 3.1Using /dev/sdaWelcome to GNU Parted! Type 'help' to view a list of commands.(parted) print                                                            Model: ATA WDC WD20EZRX-00D (scsi)Disk /dev/sda: 2000GBSector size (logical/physical): 512B/4096BPartition Table: gptDisk Flags: Number  Start   End     Size    File system     Name                  Flags 1      1049kB  211MB   210MB   fat16           EFI System Partition  boot 2      211MB   735MB   524MB   ext4 3      735MB   54.2GB  53.5GB 4      54.2GB  62.4GB  8187MB  linux-swap(v1) 5      62.4GB  2000GB  1938GB(parted) unit compact                                                     (parted) rm 5                                                             Error: Partition(s) 5 on /dev/sda have been written, but we have been  unable to inform the kernel of the change, probably because it/they are  in use.  As a result, the old partition(s) will remain in use.  You  should reboot now before making further changes.Ignore/Cancel?  cancel                        (parted) quitInformation: You may need to update /etc/fstab.EDIT: Per @TomHunt's suggestion, I re-installed CentOS 7 on the machine, this time using LVM as the partition type for all the relevant partitions, including the large 1.8 TB partition.  However, parted is still giving the same error when I try to rm 3 to prepare to partition the 1.8 TB partition.  Here is the terminal log for my most recent attempt:  [root@localhost ~]# fdisk -lWARNING: fdisk GPT support is currently new, and therefore in an experimental phase. Use at your own discretion.Disk /dev/sda: 2000.4 GB, 2000398934016 bytes, 3907029168 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 4096 bytesI/O size (minimum/optimal): 4096 bytes / 4096 bytesDisk label type: gpt#         Start          End    Size  Type            Name 1         2048       411647    200M  EFI System      EFI System Partition 2       411648      1435647    500M  Microsoft basic  3      1435648   3906914303    1.8T  Microsoft basic Disk /dev/mapper/luks-75fe4a52-a76f-4dfb-8cb9-da59ba955a55: 1999.6 GB, 1999602974720 bytes, 3905474560 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 4096 bytesI/O size (minimum/optimal): 4096 bytes / 4096 bytesDisk /dev/mapper/centos-swap: 8187 MB, 8187281408 bytes, 15990784 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 4096 bytesI/O size (minimum/optimal): 4096 bytes / 4096 bytesDisk /dev/mapper/centos-root: 53.7 GB, 53687091200 bytes, 104857600 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 4096 bytesI/O size (minimum/optimal): 4096 bytes / 4096 bytesDisk /dev/mapper/centos-home: 1937.7 GB, 1937718116352 bytes, 3784605696 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 4096 bytesI/O size (minimum/optimal): 4096 bytes / 4096 bytes[root@localhost ~]# df -T -hFilesystem              Type      Size  Used Avail Use% Mounted on/dev/mapper/centos-root ext4       50G  836M   46G   2% /devtmpfs                devtmpfs  3.8G     0  3.8G   0% /devtmpfs                   tmpfs     3.8G     0  3.8G   0% /dev/shmtmpfs                   tmpfs     3.8G  8.6M  3.8G   1% /runtmpfs                   tmpfs     3.8G     0  3.8G   0% /sys/fs/cgroup/dev/sda2               xfs       494M  115M  379M  24% /boot/dev/sda1               vfat      200M  9.8M  191M   5% /boot/efi/dev/mapper/centos-home ext4      1.8T   77M  1.7T   1% /home[root@localhost ~]# partedGNU Parted 3.1Using /dev/sdaWelcome to GNU Parted! Type 'help' to view a list of commands.(parted) print                                                            Model: ATA WDC WD20EZRX-00D (scsi)Disk /dev/sda: 2000GBSector size (logical/physical): 512B/4096BPartition Table: gptDisk Flags: Number  Start   End     Size    File system  Name                  Flags 1      1049kB  211MB   210MB   fat16        EFI System Partition  boot 2      211MB   735MB   524MB   xfs 3      735MB   2000GB  2000GB(parted) rm 3                                                             Error: Partition(s) 3 on /dev/sda have been written, but we have been unable to informthe kernel of the change, probably because it/they are in use.  As a result, the oldpartition(s) will remain in use.  You should reboot now before making further changes.Ignore/Cancel? cancel                                                     (parted) quit                                                             Information: You may need to update /etc/fstab.So how do I actually partition this drive?
why can't I partition a LUKS mounted partition?
centos;partition;luks;gparted;parted