Users can set a preferred tier when creating or modifying a virtual machine (VM) disk drive. In most cases, users leave it set to default (which can be configured under System > System Settings > Default VM drive Tier). However, setting a VM disk drive to a specific tier may behave unexpectedly, if that configured tier does not exist. In these scenarios, this is how the system will select which tier to use.
- When setting a preferred tier to a value that doesn't exist, for example setting it to Tier 3 in a system with only Tier 1 and Tier 4 storage available, the system will next attempt to pick the next higher (slower) tier. In this example, since there is no Tier 3 storage available, the system will default to Tier 4 instead.
- When setting a preferred tier to a value that doesn't exist, for example setting it to Tier 3 in a system with only Tier 1 and Tier 2 storage available, that does not have a lower tier of storage available, the system will next attempt to pick the next lower (faster) tier. In this example, since there is no Tier 3 storage available, the system will pick Tier 2 instead.
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