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I am looking at Azure D-Series Virtual Machines and comparing them with DS-Series Virtual Machines. I see the disk in D-Series is temporary SSD (whatever that means) while in DS-Series it's local SSD. My understanding so far was that temporary SSD means that live within that machine so if the machine changes (e.g. get scaled up or down) then the data will be lost. Here are my questions.
Thanks Yannis
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A-series VMs have CPU performance and memory configurations best suited for entry level workloads like development and test.
The D-series Azure VMs offer a combination of vCPUs, memory, and temporary storage able to meet the requirements associated with most production workloads. The Dv3 virtual machines are hyper-threaded general-purpose VMs based on the 2.3 GHz Intel® XEON ® E5-2673 v4 (Broadwell) processor.
There are three main disk roles in Azure: the data disk, the OS disk, and the temporary disk.
Azure virtual machines have input/output operations per second (IOPS) and throughput performance limits based on the virtual machine type and size. OS disks and data disks can be attached to virtual machines. The disks have their own IOPS and throughput limits.
When booted without any banked credits, the B series will only have access to allow for a small fraction of total CPU utilization until a bank of credits can be built up. Azure D Series General purpose compute * D-series VMs feature fast CPUs and optimal CPU-to-memory configuration, making them suitable for most production workloads. DSv3 ...
D-series VMs provide faster processors, a higher memory-to-core ratio, and a solid-state drive (SSD) for the temporary disk. For details, see the announcement on the Azure blog, New D-Series Virtual Machine Sizes. DS-series VMs can use Premium storage, which provides high-performance, low-latency storage for I/O intensive workloads.
Azure A Series. Entry-level economical VMs for dev/test *. These are generally used in small deployments where cost consciousness outweighs performance. You should only use these in rare instance implementations with non-customer facing VMs.
The Da v4 and Das v4 Azure VM-series provide up to 96 vCPUs, 384 GiBs of RAM and 2,400 GiBs of SSD-based temporary storage and feature the AMD EPYC™ 7452 processor. The Ds-series, Dds-series, and the Das-series VMs both support Azure Premium SSDs and Ultra Disk storage depending on regional availability.
Yes, what are you talking about is the local SSD disk that is onboard by default. That local disk is not guaranteed to be persistent - so, Azure is talking about hardware failures that can delete the data. Or not. The same time, it is not guaranteed that it will be lost because it is localized to the local hardware.
Every VM has the persistent disk as well that is localized in the Azure Storage - that should be persisted whatever happens, because there is a replication, etc.
DS-series can use the Premium Storage which is the powerful storage. You can compare them by yourself (i would not include the data here because it may change in a future). But in a nutshell, D-series VMs are designed to run apps that demand higher compute power and temporary disk performance. DS-series VMs are able use Premium Storage, that provides high-performance, low-latency storage for I/O intensive scenarios.
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