The Hyper-V Amigos ride again! In this episode (19) we discuss some testing we are doing to create high performant backup targets with Storage Spaces in Windows Server 2019. We’re experimenting with stand-alone Mirror Accelerated Parity with SSDs in the performance tier and HDDs in the capacity tier on a backup target. We compare backs via the Veeam data mover to this repository directly as well as via an SMB 3 file share. We look at throughput, latency and CPU consumption.
One of the questions we have is whether an offload card like SolarFlare would benefit backups as these offload not just RDMA capable workloads. The aim is to find how much we can throw at a single 2U backup repository that must combine both speed and capacity. We discuss the reasons why we are doing so. For me, it is because rack units come at a premium price in various locations. This means that spending money to come up with repository building blocks that offer performance and capacity in fewer rack units ensure we spend the money where it benefits us. If the number of rack units (likely) and power (less likely) are less of a concern the economics are different.
We also address the drawbacks of an SMB 3 backup target and we will show you a solution in a later episode when we leverage a continuously available file share to solve this while also providing failover capabilities. This can be done via S2D or shared storage. The question remains if storage spaces put too much load on the CPUs compared to a RAID controller approach, but this is debatable today. When it comes to write-back cache, that’s why they invented MVMe!
One benefits with storage spaces is that ReFS can auto repair corrupt bist from the redundant copies and as such offers protection against bit rot.
While this is just a small lab setup we are getting some interesting results and pointers to further investigate. The only real show stopper is the ridiculous up mark OEMs have for SSD and NMVE drives. That is way too high and more than any added value of testing and support can justify.
Anyway, enjoy the webcast and we hope to deliver a few follow-ups in the near future. Even PMEM with Intel Optane DC memory is in the works!
Your humble Hyper-V Amigos