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How to Resize RAID 5 without data loss?

Updated on Dec 19, 2018 by Tracy King to Partition Master

Resize and manage Raid 5 partitions with the reliable RAID 5 partition manager software - EaseUS Partition Master Server Edition.

Do you need to resize RAID 5? If so, you might want to know the reliable way to resize RAID 5 without destroying any data. Then please jump to the end of this article, and you will find the easiest and safest solution to resize RAID 5. If you would like to get a better understanding of RAID 5 before partitioning RAID 5, this article will also provide the necessary information.

Brief introduction of RAID

Before introducing RAID 5, we should know what RAID is.

RAID stands for Redundant Array of Independent Disks which is the organization of multiple disks into a large, high-performance logical disk. Disk arrays stripe data across multiple disks and access them in parallel to achieve higher data transfer rates on large data accesses and higher I/O rates on small data accesses.

According to various combinations of approaches giving different levels of protection against data loss, capacity, and speed, several levels of RAID are available, including RAID 0, RAID 1, RAID 2, RAID 3, RAID 4, RAID 5 and RAID 10 (1+0), etc.

What Is RAID 5?

As one of the most popular RAID levels, RAID 5 stripes both data and parity information across three or more drives. It is similar to RAID 4 except that it exchanges the dedicated parity drive for a distributed parity algorithm, writing data and parity blocks across all the drives in the array.

RAID5 removes the "bottleneck" that the dedicated parity drive represents, improving writing performance and allowing somewhat better parallelism in a multiple-transaction environment. Fault tolerance is maintained by ensuring that the parity information for any given block of data is placed on a drive separate from those used to store the data itself. The performance of a RAID 5 array can be "adjusted" by trying different stripe sizes until one is found that is well-matched to the application being used.

The following image can visually depict RAID 5:


Why do We need to resize RAID 5

Considering both price and reliability, RAID 5 is one of the most popular RAID level, being preferred by most Windows Server users. To maximize the performance of server computers, IT administrators need to repartition RAID 5 regularly, especially to resize RAID 5 without data loss.

Here's a typical example.

I have an SBS2003 standard server. My system partition C: drive is run out of place on the created RAID 5? Do I need to recreate a RAID 5?

The best solution under this condition is to resize RAID 5 instead of recreating a RAID 5.

How to resize RAID 5 without losing data

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 Server 2016 is supported

Easy operation and data security are undoubtedly the key factors that IT administrators concern about when resizing RAID 5. Any unsuitable operations might destroy the valued data and files on the server computers. Thus reliable third-party RAID partitioning software is needed, such as EaseUS Partition Master Server Edition.

EaseUS Partition Master Server Edition is compatible with Windows Server 2000/2003/2008 and desktop 2000/XP/Vista/Windows 7 32 and 64 bit systems. And all levels of hardware RAID are supported. This powerful server partition software allows you to perform basic and advanced partition operations on your RAID partitions without data loss, including: Resize and Move partitions, Copy partition, Copy disk, Format partitions, Convert partitions, etc.

Among these features, RAID resizing utility is highly recommended since you can resize RAID (RAID 5, RAID 0, RAID 1, etc) without any data loss. Here's an example to resize RAID 5 partition with this RAID partitioning software.


Step 1: Run EaseUS Partition Master

Run Server partition manager

Step 2: Resize Server Partition

1. To shrink a Server partition:

  • Right-click a partition which you want to shrink and select "Resize/Move".
Resize partition size to free up space
  • Drag the partition handle leftward to shink partition and click "OK" to continue.
Extend Server Partition

2. To extend a Server partition

Repeat 1 to free up unllocated space on the Windows Server disk, and continue with tips below to extend a Server partition.

  • Right-click partition next to the unallocated space, select "Resize/Move".
  • Drag the partition rightward or leftward to move unallocated space next to the target partition.
  • Click "OK".
  • Right-click on the target Server partition, select "Resize/Move" and drag the partition into the unallocated space.
  • Click "OK" to continue.
Extend Server Partition

Step 3: Apply and keep all changes

Click the "Execute Operation" button and click "Apply" to keep all changes.