а кто-то помнит, IO на темп диске идет "в зачет" общего IO лимита виртуалки?
IO для временного диска делится с кэшированными дисками, ограничивается доступными IOPS для размера ВМ:
Scenario 2: Temp disk is required
1 If temp local disk is required, do not enable disk cache on mission critical disk to prevent disk performance issue due to machine level cached throttling, which is triggered by the excessive temp local disk usage. If you want to enable the cache on any of the data disks, bear in mind the disk might be extremely slow when there is a heavy IO issue on temp local disk. In the following test, it shows 0.11M/s throughput on a premium P30 disk for sync IO.
2 Total (cached and uncached, not include local temp disk) disk throughput < VM uncached max throughput