After #7837, 2TiB gimlets will have roughly 1667 allocated as VMM reservoir, but the maximum instance RAM is hard coded as 256GiB:
|
pub const MAX_MEMORY_BYTES_PER_INSTANCE: u64 = 256 * (1 << 30); // 256 GiB |
Customers deploying these gimlets are requesting larger instances than this. In order to support this, Nexus has to be aware that these gimlets have more of a reservoir to allocate from, and offer larger instance sizes accordingly.
After #7837, 2TiB gimlets will have roughly 1667 allocated as VMM reservoir, but the maximum instance RAM is hard coded as 256GiB:
omicron/nexus/src/app/mod.rs
Line 120 in d4a64cd
Customers deploying these gimlets are requesting larger instances than this. In order to support this, Nexus has to be aware that these gimlets have more of a reservoir to allocate from, and offer larger instance sizes accordingly.