The x2iedn.xlarge pairs 4 vCPU with 128 GiB of RAM, the 32.00 GiB-per-vCPU ratio that marks a memory-optimized instance. In the name, "x" is the extra-memory line, "2" is the generation, "iedn" marks Intel processors, extended capacity, local NVMe storage and enhanced networking and "xlarge" is the size within the x2iedn family. It runs on Intel Xeon Scalable (Icelake) at 3.5 GHz, and AWS introduced it in March 2022. AWS has since shipped x8i; x8i.xlarge is the direct replacement at this size, scoring 98,051 CoreMark/s against this instance's 67,218 — roughly 46% more throughput for the same vCPU count. mh.vs1.2xlarge is the closest Spot shape: 16 vCPU and 128 GiB, so 12 more vCPU and the same memory, $0.834/hr on AWS in US East (N. Virginia), from $0.021/hr on Rackspace Spot.
Match qualityNo local disk
x2iedn.xlarge comes with 1 × 118 GB NVMe SSD attached to the machine. Rackspace Spot nodes use network storage only, so that disk does not come with it.
If you were using the local disk as fast scratch space — temporary files, a local cache, an index — you will need a persistent volume or object storage instead, and both are slower to read. If it was just extra space you never depended on, nothing changes.
