![]() If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository. The minimum OS disk size for AKS is 30GB but the default for VMs with 1-8 vCPU is 128GB (P10 for managed). When you pick a VM instance size check the size of the included temporary storage or cache. Instructions for interacting with me using PR comments are available here. When you want to use Ephemeral os disks you need to create a new nodepool with the argument -node-osdisk-type ephemeral (default value is managed ). The storage cost almost doubles the operating cost of my cluster B2ms one-node cluster (33 -> 58/m) with a 100 GiB OS disk. It makes zero sense to offer VM types that dont support ephemeral OS disks. Without ephemeral disks: 6 mins, 56 secondsīenchmark 2 - simple IO measurement on c:ĭiskspd.exe -c2G -w50 -b4K -r -o1 -W60 -d60 -Sh testfile.datĢG file, random 4k access, 50% read 50% write, single-threaded, 60s warmup, 60s testing, caching disabled The site in the docs wrongfully states that Bs VMs support ephemeral OS disks. VM Image: MicrosoftWindowsServer:WindowsServerSemiAnnual:Datacenter-Core-1809-with-Containers-smalldisk:180410īenchmark 1 - pull the lift & shift demo app This provides lower read/write latency, along with faster node scaling and cluster upgrades. This has some substantial performance improvements because it allows the VM to get better disk throughput, while taking advantage of the pre-pulled Windows Server Core images. Ephemeral OS disks are stored only on the host machine (node VM), just like a temporary disk. I did some manual tests of the new ephemeral disk option using Windows containers. That's ok for agent nodes because persistent storage should be on Azure Disk or Azure Files, not the local nodes. These deploy and run faster because the IO remains local to the compute node. Is this an ISSUE or FEATURE REQUEST? (choose one): Feature requestĪzure now offers ephemeral OS disks in public preview.
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