Increase initial EBS volume size

[scwatts]

Background

• in the absence of FusionFS, I'm currently using EBS autoscale to increase available scratch space at runtime
• the default scale-up threshold of 50% and initial 20 GB EBS volume doesn't provide a sufficient buffer in all cases
• e.g. a resource-ramped SvPrep Depth Annotator tasks run out of EBS space before it can be scaled
  • possibly related to higher instance memory size; larger memory buffer being dumped to disk too quickly
• observed in prod for SBJ04367, reproduced in dev

Changes

• increase initial volume to default 200 GB to give an effective buffer size of 100 GB

Other notes

• an increase to 30 GB resolved the issue described above for SBJ04367 resource-ramped SvPrep Depth Annotator task
  • however, the error retriggered in subsequent runs at same point with 30 GB and 50 GB initial volume sizes