4.f Add new partitions and logical volumes, and swap to a system non-destructively

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Commands:

• mkswap (8) - set up a Linux swap area
• swapon (2) - start/stop swapping to file/device

Create a physical volume

# pvcreate /dev/sdd  
  Physical volume "/dev/sdd" successfully created.
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Create the volume group

# vgcreate swap2 /dev/sdd
  Volume group "swap2" successfully created
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Create the logical volume

# lvcreate -l 100%FREE -n swap2 swap2
  Logical volume "swap2" created.
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Get the lv path

# lvdisplay swap2 | grep 'LV Path'
  LV Path                /dev/swap2/swap2
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Create the swap area

# mkswap -L swap2 /dev/swap2/swap2
Setting up swapspace version 1, size = 3 GiB (3217027072 bytes)
LABEL=swap2, UUID=02dac232-4bb8-4f18-8a29-c5c77756aaa0
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You can list the swap devices for comparison

# swapon -s
Filename                Type        Size    Used    Priority
/dev/dm-1                                  partition    2158588    36800    -2
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Enable the device for paging

# swapon /dev/swap2/swap2
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Compare the list of swap device again

# swapon -s
Filename                Type        Size    Used    Priority
/dev/dm-1                                  partition    2158588    36800    -2
/dev/dm-4                                  partition    3141628    0    -3
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Add it to fstab

/dev/swap2/swap2   none                    swap    defaults        0 0
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📌 EXAM TIP

Be prepared to:

• Add a standard partition to a device and mount it (4.a List, create, delete partitions on MBR and GPT disks)
• Resize a standard partition (5.c Extend existing logical volumes)
• Add a new device to an existing volume group and create a new logical volume partition

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