3 ms·

How do you get persistence if all your storage is ephemeral?

• mrkurt 12y ago
  It's not all ephemeral, the physical servers we run are old-school redundant (RAID-10, two power supplies, etc). Even ephemeral is persistent — it's just something that'll go away if you migrate your instance to new host hardware. Deployments are on two servers and the write ahead log is streamed to both the slave and offsite secondary storage. Replication is async so there is potentially a small window of data loss if a whole server goes. We are considering letting people opt in to synchronous replication, but don't have it available yet.
  • hydrogen18 12y ago
    Ephemeral storage is just that - ephemeral. Amazon can decide to retire your instance at any time. So your persistence plan is RAID 10 it sounds like.