The same with previous versions, Low disk space is also common issue in Windows Server 2019. After running the server for a period of time, system partition C is running out of space. In that case, you'd better try to fix this issue as fast as possible, because it may cause server stuck or reboot expectedly.
If you contact server OEM manufacturer, they may tell you to back up everything, delete and recreate partitions, finally restore from backup. It is indeed a solution, but it may cost a whole day, during this process, the server is offline. Obviously, it is much faster to extend system partition for this server. In this article, I'll show you 3 ways to extend system volume on Windows Server 2019 with detailed steps.
Actually, this is not a good method, it is only an option if you don't want to use third party software.
Windows Server 2019 has 2 native tools to help resize disk partition - Disk Management and diskpart. Disk Management has Extend Volume Wizard with graphical interface, diskpart works via command prompt. They works in different way, but they has same restrictions. No matter which tool you use to extend os partition, your disk partition structure must meet the requirements:
If there is no or you cannot delete the right contiguous partition, neither Disk Management nor diskpart can help you extend system drive. When extending a data partition, there are additional restrictions, learn why Extend Volume greyed out.
Steps to extend system partition/volume in Windows Server 2019 Disk Management console:
If you like to use command prompt tool, refer how to extend partition with diskpart in Windows Server 2019.
If there's no right contiguous partition or you don't want to delete it, you have to run disk partition software. Remember: make a backup first and run safe partition software, because there's potential system damage and data loss risk while shrinking and extending partitions.
Better than other disk partition tools, NIUBI Partition Editor is much safer and faster because of the advanced technologies:
Then how to extend system partition for Server 2019? There are 2 options, follow corresponding method according to your own disk partition structure.
In most of servers, there's at least one data volume on the same system disk, then you can extend system drive by taking free space from the data partition(s).
Steps to expand system partition in Windows Server 2019 with NIUBI:
If you want to expand C: drive by shrinking the nonadjacent partition (such as E:), there's an additional step to move Unallocated space before adding into C drive.
If few servers, there's no other partition or not enough free space on the same disk. In that case, no software can extend system volume by taking free or Unallocated space from another separated disk. But, you can copy this disk to another larger one, then additional disk space can be added into C drive (and other partitions).
Follow the steps in the video to expand OS partition in Windows Server 2019 with another disk:
If you use any types of hardware RAID array with any brand of controller, there's no difference, simply follow either method above.
If you run Windows Server 2019 as virtual machine in VMware or Hyper-V, follow the steps in the first video above when there's available free space on the same disk. If there's unavailable free space on a disk, you can extend system partition for virtual machine without copying to other disk. Follow the steps below to expand virtual disk:
After expanding disk, additional space is shown as Unallocated on the end. Follow the steps to move and merge Unallocated space to other volume(s).
Besides shrinking, extending, moving partition and copying disk, NIUBI Partition Editor helps you do many other disk partition operations.