Spaces Direct - My mind still can't get around a 2 node system having one failure domain.@Rand__ well, yes.. Storage Spaces Direct in parity resiliency is pathetically weak in terms of performance unless you are going to throw in an enormous amount of NVMe or flash cache to fully cover your working set. However, S2D performs quite good in "2-way mirror" mode. The only major drawback in 2-node S2D deployment is the lack of redundancy (FTT=1). You can fix this by adding the third node and do the "3-way mirror" though.
As for smaller vendors, I'm referring mostly to StarWind vSAN, which is a performance beast even in 2-node configuration. HPE VSA is also great, but it's inability to run in kernel mode leads to noticeable performance compromises. Anyway, from what I have tested/learned, you should not consider VMware VSAN if you are building a performance-oriented cluster. VSAN has other benefits, but performance is not one of them.
Agree, I should have elaborated on this point. My concern is not having one node as a failure domain which is completely normal for 2-node configuration, but the fact that all disks in the cluster are also fallen under the FTT=1. For example, with HPE VSA or StarWind vSAN I can configure the local redundancy using hardware RAID controller. Imagine 2-node all-flash setup where you can totally lose one of the nodes and 2 disks in the other node with the little to no impact on production availability.Spaces Direct - My mind still can't get around a 2 node system having one failure domain.
Yep, the free version is limited. On the plus, vs VSAN it works well with spinners, can function in a 2-node config, and can run replication smaller higher latent lings (relative to your load requirements).Is Adaptive Optimization a must have feature on HPE VSA?
Just found the free for first TB version Hewlett Packard Enterprise
Edit: Looks like it :/
Adaptive Optimization (AO) is HPE’s sub-volume automated storage tiering feature. Using AO, you can store the most active part of your volume on fast disk or SSD to make it readily accessible. The remainder of your volume is stored on a less expensive, typically slower, higher capacity disk. The data is balanced between tiers automatically and continuously in real-time. To get the AO feature, purchase StoreVirtual VSA Ready Nodes or a full StoreVirtual VSA license (10TB or 50TB).
Spaces Direct - My mind still can't get around a 2 node system having one failure domain.
Not convinced on the kernel mode point, there have been a number of discussions / posts / stats that appear to debunk that particular claim. I've no actual experience other than to note that my HPE VSA with tiered storage is faster than my all flash 4 node VSAN at this point in time. Which kind of alludes to your last point
In Kernel or Not In Kernel – This Is The Hyperconverged Question
Yep, the free version is limited. On the plus, vs VSAN it works well with spinners, can function in a 2-node config, and can run replication smaller higher latent lings (relative to your load requirements).
Yes assuming you want automated failover, but you can create a virtual manager to create a quorum if you can make do with manual failover.
I don't think it is - direct IO path is not in kernel and yet offers excellent performance. Struggling to understand the relevance of Xbox (one).This is an outdated link really. If you pass-thru your hardware into VM using SR-IOV & assign proper amount of vCPU to it you'll get an excellent performance. This is how Microsoft XBOX works: Hyper-V kernel, and all hardware runs inside own virtual machine