Wisp Hill

NFS, EBS, Volume terminologies

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nfs ebs volume device

NFS hard mount and soft mount

Hard mount

  • Application writes/reads to NFS and got error, it gets stuck forever, it’s for data safety, important files, DBS Soft mount:
  • NFS client returns I/O error after few retries. It’s for caching, temp data, lead to data corruption

Terminologies

  1. Attach volume: Attach EBS 100GB to the EC2 instance device: /dev/sdf
  2. Mount device: Mount device /dev/sdf to the directory /usr/data
  3. Device is busy: The device is still mounting to a directory.

EBS

  1. Single AZ
  2. With K8s, nodeAffinity to force pod and EBS to be in the same AZ
  3. If it requires multiple AZ for HA > NFS

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