As part of our ongoing improvement initiatives, we will be kicking off our storage upgrade programme in EU8 (London) to give a better, predictable and consistent experience when it comes to cloud storage performance. As part of the initiative, we are migrating the Standard/High Performance/Economy Disk Speeds in EU8 (London) to the new “Burstable” storage model.
As part of this effort, we will be making changes to ALL disks associated with ALL existing Cloud Servers that are using the Economy, Standard, and High Performance disk speeds.
The enablement will begin outside of the software upgrade window on April 1 at 12:00 UTC (2:00 PM Central European Standard Time). The change will take several hours to take effect across all existing Cloud Servers.
CloudControl Change Id: OEC-11317
Time: April 1, 2019 at 12:00 UTC (2:00 PM Central European Standard Time)
Expected Total Duration: Up to 6 hours
For all NEW and EXISTING disks on all Cloud Servers using Economy, Standard, or High Performance disk speeds:
1. After the change, Disks will be allowed to burst only up the following IOPS limits based on their disk speed:
ECONOMY: Greater of 100 IOPS or 0.5 IOPS/GB based on the size of the disk
STANDARD: Greater of 500 IOPS or 3 IOPS/GB based on the size of the disk
HIGH PERFORMANCE: Greater of 800 IOPS or 6 IOPS/GB based on the size of the disk
Example: A 100 GB Disk using Standard Disk Speed will be assigned a 500 IOPS burstable maximum. A 180 GB Disk using Standard Disk Speed will be assigned 540 IOPS burstable maximum (180 GB x 3 IOPS/GB).
NOTE: When this change is implemented on a given Cloud Server disk, it will take immediate effect. No restart is required.
2. After the change is applied AND the server is restarted or migrates between ESXi hosts, disks will be allowed to burst up to a Throughput limit equal to the IOPS maximum x 16 KB. This limit applies in addition to the above IOPS limit.
Example: A 100 GB Disk using Standard Disk Speed will be assigned an 8,000 KB/second Throughput maximum (500 IOPS x 16 GB). A 180 GB Disk using Standard Disk Speed will be assigned an 8,640 KB/second Throughput maximum (540 IOPS x 16 KB)
NOTE: When this change is implemented on a given Cloud Server disk, it does not take immediate effect if the server is running. Instead, it will take effect on restart of the server and/or when the server migrated between ESXi hosts as part of normal vSphere Distributed Resource Scheduler (DRS) activities.
For more information please refer to the “Introduction to Disk Speeds" section of the following article:
Introduction to Cloud Server Local Storage ("Disks") and Disk Speeds - https://docs.mcp-services.net/x/UwIu