File System Considerations with Storage Spaces

Some users might be tempted to use exFAT as a file system on a Storage Spaces managed virtual disk. One of the reasons for this might be that exFAT doesn’t bother users with ownership permissions.

Admins making that decision should take into consideration that Windows 10 (as of build 19041, version 2004) does not have a built-in capability to resize an exFAT partition. Virtual disk managed by Storage Space built with ProvisioningType value of Thin will retain it’s initial size forever and will not grow. You might be able to use third party apps to resize it, but that comes with it’s own set of risks to data integrity of the volume. That is one of the reasons why Storage Spaces UI will only offer one file system option when creating a virtual disk – the NTFS file system.

Storage Spaces and Slow Parity Performance

Collected from my experience, here is how to deal with slow parity virtual disk performance in Microsoft Storage Spaces. In most cases, recreation will be required, but in some cases, you might get away with not having to dump all your data elsewhere. This article presumes a Storage Spaces array with no SSDs and no cache. The problem being solved here is HDDs in SS parity volumes providing 20 to 40 MB/s writes instead of multiples of disk’s rated write speeds (100 to 300 MB/s).

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