The document discusses disk partitioning and some key differences between MBR and GPT partitioning schemes. It covers maximum partition and disk size limits imposed by 32-bit versus 64-bit addressing, as well as the increased number of partitions supported by GPT. It also briefly mentions journaling, swap partitions, and tools used to manage partitions like fdisk, gdisk, and mkswap.

1. Limit space for Apps/Users•
Multiboot OS•
Data/OS separation•
Swapping•
Why partitions?
MBR Master Boot Record
BIOS firmware - supports up to 4 primary partitions
Extended + Logical = 15 max
size in 32bit values -> Max part size limit 2TiB -> problem!
GPT - GUID Partition Table
UEFI firmware (Unified Extensible Firmware Interface)
128 partitions
size in 64 bit values -> Max part size limit 8ZiB (8 bilion tebibytes) and 64ZiB with
larger block size
redundancy with backup copy of partition table
P P P
E
What partition type?
Disk partitions
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2. https://en.wikipedia.org/wiki/Mebibyte
example:
1 "petabyte (PB)" = 0.88817841970013 "pebibyte (PiB)"
1 "pebibyte (PiB)" = 1.1258999068426 "petabyte (PB)"
8 "gibibyte (GiB)" = 8589.934592 "megabyte (MB)"
Journaling
CoW => More efficient , save storage space
What about some size diffs I see?
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3. 8 "gibibyte (GiB)" = 8589.934592 "megabyte (MB)"
New partition creation
Create partition
gdisk -> GPT
fdisk -> MBR
Both tools create in GiB,MiB units
(no save - no problem)
Tell kernel to rescan partition table
partprobe [device]
Make the file system
mkfs -t [device]
Create a mount point
mkdir
Mount to test it
mount …
needs EPEL repo on Centos
dev or uuid
mount point
fstype
options dump fsck
FSTAB
blkid => show me all block device IDs
What about SWAP partitions ??
Normal partition creation but type 'Linux swap'
no need for mkfs
mkswap [device]
Check current mem status
free
swapon [device]
higher priority is preferable
For automounting on boot --> /etc/fstab
cfdisk or gparted alternatives
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4. swapoff [device] to switch off
swapon -a to mount swap entries from fstab!
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