Server 2019 (Windows 1809) spaceport.sys non-paged-pool memoryleak?

Copper Contributor

I use storage pools since server 2012 R2 and think its a good solution.

But there are some limitations on server 2012 R2 (re-balance) where no longer exists on server 2016 and 2019. Now I have build a new server based on server 2019 Hyper-V.


The migration was quite easy:

  • Take the storage pool offline on server 2012 R2
  • Install server 2019
  • Attach the storage pool and take it online
  • migrate it to version server 2019
  • works!

But now I have start to copy some files to the storage pool and notice that the memory consume in the non-paged-pools grows. After copy of 1TB the pool is 1GB larger. After on or two days the server crashes with out of non-paged-pool memory.

The analyse with poolmon identify the tag "Sp**".

I have found in different forums that there was a problem on server 2016 with the spaceport.sys using ReFS.


What I have try:

  • delete virtual drive (ReFS), recreate virtual drive NTFS
  • delete alls virtual drives, delete storage pool, recreate virtual drive

But I always end after copy of 5TB files in a non-paged-pool whit a size of more than 10GB.

Not sure, but I think there must be a memory leak in the spaceport.sys on server 2019.


On the hardware side I use an SuperMicro board with an intel C236 chipset.
Attached 4 SATA harddisk with same size attached to the pool.


After this I have make additional tests:

  • Hyper-V Server 2019 with Microsoft standard AHCI drivers
  • Hyper-V Server 2019 installed on a different hardware
  • Hyper-V Server 2019 installed on VMWare-Workstation
  • Server 2019 Standard (GUI) installed on VMWare-Workstation

In all cases I have build an new StoragePool based on 3 disk and create a virtual harddisk of type mirror.

Then I have copied some files (114 GB) to the virtual harddisk on the StoragePool and repeat this 3 times.

I can notice that after each copy process the non-paged-pool grows by 20MB.



on my point of view, I think there is a memory leak inside the storage space feature (Windows 1809)


1 Reply

I think the issues is fix with the cumulative update 2019-06.

I have install it and copy some data. After copy 1TB I see a growing of 10MB on the non-paged pool SP**. Not nothing, but much better than 1GB per 1TB data.

Can some other confirm this?