2.1 Given a scenario, install server operating systems.

📘CompTIA Server+ (SK0-005)

When installing a server operating system, one of the most important decisions is choosing the correct file system.

A file system controls how data is:

Stored on a disk
Organized into folders and files
Secured with permissions
Recovered after a crash

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

ext4
NTFS
VMFS
ReFS
ZFS

You should know:

Which operating system uses each file system
Key features
Strengths and limitations
When each one is commonly used in IT environments

1. ext4 (Fourth Extended File System)

Full name: Fourth Extended File System
Used in: Linux servers such as Ubuntu Server and Red Hat Enterprise Linux

What is ext4?

ext4 is the default file system for most modern Linux server distributions. It replaced ext3 and provides better performance, reliability, and support for larger storage.

Key Features of ext4

✔ Journaling
✔ Large file support
✔ Large volume support
✔ Backward compatibility with ext3
✔ Improved performance over ext3

1. Journaling

Journaling means the file system keeps a record (journal) of changes before actually writing them to disk.

If the server suddenly loses power:

The journal helps restore the file system quickly.
Reduces corruption.

This is extremely important for production servers.

2. Large File and Volume Support

ext4 supports:

Files up to 16 TB
File systems up to 1 EB (exabyte)

This makes it suitable for:

Database servers
File servers
Application servers

3. Where ext4 Is Used in IT Environments

Linux-based web servers
Internal file servers
Database servers
Virtual machine hosts running Linux

Limitations

Does not have built-in advanced integrity checking like ZFS
Not native to Windows systems

2. NTFS (New Technology File System)

Full name: New Technology File System
Used in: Windows Server

What is NTFS?

NTFS is the primary file system used by modern Windows Server operating systems.

If you install Windows Server, NTFS is usually the default choice.

Key Features of NTFS

✔ Journaling
✔ File and folder permissions (ACLs)
✔ Encryption (EFS)
✔ Disk quotas
✔ Compression
✔ Large file support

1. Security (Very Important for Exam)

NTFS supports Access Control Lists (ACLs).

This allows administrators to:

Control who can read files
Control who can modify files
Assign different permissions to users and groups

This is critical in enterprise environments.

2. Encryption (EFS)

Encrypting File System (EFS):

Encrypts individual files
Protects sensitive data

3. Disk Quotas

Administrators can:

Limit how much disk space each user can use

Very useful in shared file servers.

4. Where NTFS Is Used

Windows file servers
Active Directory domain controllers
Microsoft SQL servers
Application servers running Windows

Limitations

Not designed for large-scale storage resiliency like ReFS or ZFS
Not optimized for virtualization storage

3. VMFS (VMware File System)

Full name: VMware File System
Used in: VMware ESXi

What is VMFS?

VMFS is a special file system designed specifically for virtual machines.

It is used on storage volumes accessed by VMware ESXi hosts.

Why VMFS Is Important

Virtual machines are stored as files. VMFS allows:

✔ Multiple ESXi hosts to access the same storage
✔ High performance
✔ Large virtual disks
✔ Support for clustering

Where VMFS Is Used

Data centers using VMware virtualization
Shared storage systems (SAN)
High Availability (HA) clusters

Important Exam Point

VMFS is:

Not a general-purpose file system
Only used in VMware environments

4. ReFS (Resilient File System)

Full name: Resilient File System
Used in: Modern versions of Windows Server

What is ReFS?

ReFS is designed to improve data integrity and resilience compared to NTFS.

It is mainly used in:

Storage Spaces
Large data storage systems
Virtualized environments

Key Features of ReFS

✔ Automatic integrity checking
✔ Corruption detection
✔ Scalability
✔ Designed for large data sets

1. Data Integrity

ReFS:

Detects corruption automatically
Repairs corrupted data when possible

This is very useful in storage-heavy environments.

2. Scalability

Supports extremely large volumes and files, larger than NTFS in practical enterprise scenarios.

Where ReFS Is Used

Virtual machine storage on Windows
Backup servers
Large file repositories

Limitations

Not fully compatible with all NTFS features
Cannot be used as a boot drive in some Windows Server versions

5. ZFS (Z File System)

Full name: Zettabyte File System
Used in: Systems like FreeBSD and Oracle Solaris

What is ZFS?

ZFS is an advanced file system designed for:

High storage capacity
Data integrity
Storage management

It combines:

File system
Volume manager

Key Features of ZFS

✔ Built-in RAID-like functionality
✔ Snapshots
✔ Data integrity verification
✔ Self-healing
✔ Massive scalability

1. Data Integrity (Very Important)

ZFS uses checksums to:

Detect silent data corruption
Automatically repair damaged blocks (if redundancy exists)

This makes it very reliable.

2. Snapshots

ZFS allows:

Instant snapshots of data
Easy rollback to previous versions

Useful for:

Backup systems
Virtual machine storage
Large enterprise storage systems

3. Storage Pools

Instead of managing disks individually, ZFS uses:

Storage pools (zpools)

This makes storage management easier and more flexible.

Where ZFS Is Used

Enterprise storage servers
Backup appliances
High-availability storage environments
Large-scale data centers

Limitations

Requires more RAM
More complex to manage
Not native in standard Windows installations

Quick Comparison Table

File System	OS Used	Journaling	Advanced Integrity	Best For
ext4	Linux	Yes	Basic	General Linux servers
NTFS	Windows	Yes	Basic	Windows file servers
VMFS	VMware ESXi	Yes	Designed for VMs	Virtual machine storage
ReFS	Windows Server	Yes	Yes	Large Windows storage
ZFS	BSD/Solaris/Linux (optional)	Yes	Very advanced	Enterprise storage

Exam Tips for Server+ (Very Important)

You should be able to answer:

✔ Which file system is used in Linux? → ext4
✔ Which file system is default for Windows Server? → NTFS
✔ Which file system is used for VMware virtualization? → VMFS
✔ Which Windows file system improves resiliency? → ReFS
✔ Which file system provides self-healing and snapshots? → ZFS

What the Exam Tests in This Section

The exam expects you to:

Identify the correct file system for a scenario
Understand differences between Windows and Linux file systems
Recognize virtualization storage requirements
Understand data integrity and resiliency features
Know which file systems support large storage environments

Final Summary

When installing a server operating system, choosing the correct file system is critical because it affects:

Performance
Security
Reliability
Scalability
Data protection

Each file system is designed for a specific environment:

ext4 → Linux servers
NTFS → Standard Windows servers
VMFS → VMware virtualization
ReFS → Resilient Windows storage
ZFS → Advanced enterprise storage