Upgraded to storage spaces - how much ssd space do I actually need?

Question

Hello there,

I upgraded from RAID5 to storage spaces (mirror on 2 SSDs and parity on 6 HDDs).
I used the following article from Microsoft to do this: https://learn.microsoft.com/en-us/system-center/dpm/add-storage?view=sc-dpm-2019&tabs=SimpleTieredVolume

In the article Microsoft recommends using 4% of SSD-storage compared to the overall storage space.

My SSD-space is 442GB and the HDD-space is 12.8TB so we are at ~3% of SSD compared to HDD.

BUT...
at the moment we're only using 9.6TB of space for short-term back-ups (so we're "theoretically" within the 4% of SSD-space that MS recommends). I don't wanna upgrade the SSD-space because we're going to change our backup-solution in a few weeks.

So my thoughts are that as long as we stay under an amount of 11TB of short-term backups there will be no metadata on the HDD-space, right?

Best regards

Dave

Answer 1

Hi,

Your understanding is generally correct. The metadata for Storage Spaces is usually stored on the SSDs. The amount of SSD space used for metadata depends on the amount of data being managed by Storage Spaces. If you stay under the 11TB threshold for short-term backups, as you've mentioned, the metadata should remain on the SSDs, as it would still be within the 4% recommendation.