2.1 Given a scenario, install server operating systems.

📘CompTIA Server+ (SK0-005)

When installing a server operating system, one of the most important steps is configuring disk partitions and volumes correctly.

A server stores operating system files, applications, logs, databases, and user data. If disk partitions are not planned properly, the server may not boot, may run out of space, or may become difficult to manage.

For the Server+ (SK0-005) exam, you must understand:

GPT vs MBR
Basic disks vs Dynamic disks
Logical Volume Management (LVM)

Let’s explain each clearly and completely.

1. Understanding Partitions and Volumes

What is a Partition?

A partition is a logical section of a physical disk.

A single hard drive or SSD can be divided into multiple partitions. Each partition can:

Store a file system
Contain an operating system
Store application data
Be used for swap or paging
Be used for backups

When installing a server OS, you decide how to divide the disk.

What is a Volume?

A volume is a usable storage area created on a partition (or sometimes across multiple disks).

A volume:

Has a file system (NTFS, ReFS, ext4, XFS, etc.)
Has a drive letter (Windows) or mount point (Linux)
Is used to store data

In simple terms:

Physical Disk → Partition → Volume → File System → Data

2. MBR vs GPT (Partition Table Types)

Before creating partitions, the system needs a partition table.

A partition table tells the system:

How many partitions exist
Where they start
Where they end
Which one is bootable

There are two main types:

MBR (Master Boot Record)
GPT (GUID Partition Table)

A. Master Boot Record (MBR)

MBR is the older partitioning system.

Key Characteristics:

Supports disks up to 2 TB
Maximum of 4 primary partitions
Stores boot information in the first sector of the disk
Used with Legacy BIOS

Partition Limitations:

MBR allows:

4 primary partitions
OR
3 primary + 1 extended partition

The extended partition can contain multiple logical drives.

Problems with MBR:

Limited to 2 TB disk size
Limited partition count
Single boot record (if corrupted, system may not boot)
Less resilient

B. GUID Partition Table (GPT)

GPT is the modern partitioning system.

Key Characteristics:

Supports disks larger than 2 TB
Supports up to 128 partitions (Windows default)
Uses multiple partition table copies (backup)
Used with UEFI firmware
More reliable and fault tolerant

GPT stores:

Primary partition table
Backup partition table at the end of the disk
CRC checks for integrity

GPT vs MBR Comparison (Exam Focus)

Feature	MBR	GPT
Maximum Disk Size	2 TB	9.4 ZB (very large)
Max Partitions	4 primary	128 (Windows default)
Firmware Support	BIOS	UEFI
Redundancy	No	Yes (backup table)
Reliability	Lower	Higher

When to Use GPT vs MBR

In modern server installations:

GPT is recommended
Required for UEFI systems
Required for disks larger than 2 TB
Standard in modern Windows and Linux servers

MBR may still be used:

On older hardware
Legacy systems with BIOS

For the Server+ exam:
If you see large disks, UEFI, or modern server OS → choose GPT.

3. Basic Disk vs Dynamic Disk (Windows Concept)

In Windows Server environments, disks can be configured as:

Basic disk
Dynamic disk

A. Basic Disk

Default disk type in Windows.

Uses:

MBR or GPT partition table
Standard partitions

Supports:

Primary partitions
Extended partitions
Logical drives

Simple and stable.

Best for:

Most server installations
OS installation
Standard storage

B. Dynamic Disk

Dynamic disks provide advanced volume features.

Instead of traditional partitions, dynamic disks use:

Dynamic volumes

These volumes allow advanced configurations across multiple disks.

Dynamic Disk Volume Types

1. Simple Volume

Uses space from one disk
Similar to primary partition

2. Spanned Volume

Combines space from multiple disks
Acts as one large volume
No fault tolerance

If one disk fails → data lost.

3. Striped Volume (RAID 0)

Data spread across multiple disks
Improves performance
No fault tolerance

If one disk fails → all data lost.

4. Mirrored Volume (RAID 1)

Data copied to two disks
Fault tolerant
If one disk fails, system continues working

5. RAID-5 Volume

Uses 3 or more disks
Striping with parity
Fault tolerant (one disk failure allowed)

When to Use Dynamic Disks

Used in:

Older Windows Server versions
When software RAID is needed
When extending volumes across disks

However:
Modern systems often prefer:

Hardware RAID
Storage Spaces (newer Windows)
SAN storage

For the exam:
Understand dynamic disk supports software RAID.

4. Logical Volume Management (LVM) – Linux Concept

In Linux environments, disk management is handled differently.

Instead of simple partitions, Linux commonly uses:

Logical Volume Management (LVM)

What is LVM?

LVM is a flexible storage management system.

It allows administrators to:

Combine multiple disks
Resize volumes
Extend storage easily
Create snapshots
Manage storage dynamically

LVM is commonly used in Linux server distributions like:

Red Hat Enterprise Linux
Ubuntu Server

LVM Structure (Very Important for Exam)

LVM has three main layers:

1. Physical Volume (PV)

Actual disk or partition prepared for LVM.

Example:

/dev/sda
/dev/sdb1

2. Volume Group (VG)

Pool of storage created from one or more PVs.

Think of it as a storage container.

3. Logical Volume (LV)

Virtual partition created from the volume group.

Logical volumes:

Act like normal partitions
Can be resized
Can be mounted
Can host file systems

LVM Workflow

Physical Disk → PV → VG → LV → File System → Mount

Advantages of LVM

1. Resize Volumes Easily

You can increase size without reinstalling OS.

2. Add New Disks

Add new disk to volume group and expand storage.

3. Snapshots

Create snapshot of volume for backup purposes.

4. Flexible Storage

Better for databases, log-heavy systems, application servers.

Why LVM is Important in Server Environments

Servers grow over time:

Databases grow
Log files increase
Applications require more storage

LVM allows expansion without downtime in many cases.

5. Key Differences: Dynamic Disk vs LVM

Feature	Dynamic Disk (Windows)	LVM (Linux)
OS	Windows	Linux
Software RAID	Yes	Yes
Resize Volumes	Limited	Yes (more flexible)
Snapshots	No	Yes
Storage Pooling	Yes	Yes
Common in Modern Servers	Less common	Very common

6. Exam Scenario-Based Understanding

You may see questions like:

Scenario 1:

A server has a 4 TB disk and uses UEFI.
Correct Answer → GPT

Scenario 2:

A Windows Server needs software RAID 1 without hardware RAID.
Correct Answer → Dynamic Disk with Mirrored Volume

Scenario 3:

A Linux server needs storage expansion without downtime.
Correct Answer → LVM

Scenario 4:

Older server using BIOS and 1 TB disk.
Correct Answer → MBR (possible), but GPT still preferred if supported

7. Important Exam Points to Remember

GPT

Required for disks >2 TB
Required for UEFI boot
Modern standard

MBR

2 TB limit
4 partition limit
Used with BIOS

Dynamic Disk

Windows feature
Software RAID
Spanned, striped, mirrored, RAID-5 volumes

LVM

Linux feature
PV → VG → LV
Resize, snapshots, flexible storage
Widely used in enterprise Linux servers

8. Common Mistakes Students Make

Confusing partition type with file system
Thinking GPT is a file system (it is not)
Confusing dynamic disk with hardware RAID
Forgetting 2 TB limit of MBR
Mixing up PV, VG, and LV order

Final Summary (Must Remember for SK0-005)

When installing a server OS:

Choose partition style:
- GPT (modern, recommended)
- MBR (legacy)
Choose disk configuration:
- Basic disk (standard)
- Dynamic disk (Windows advanced volumes)
In Linux:
- Use LVM for flexibility
- Understand PV → VG → LV

For modern enterprise servers:

GPT + UEFI is standard
LVM is common in Linux
Hardware RAID often preferred over dynamic disk