Is Amazon AWS/EBS snapshotting just LVM, or what?

[Bill Ricker]

The lack of coherence due to OS cave not being flushed should still be a
concern.

OTOH I saw a storage level replication system propagate corruption to the
remote site's copy of the Production DBMS ... So it perfectly replicated
the primary's failure. Oops. Easiest recovery was restoring a nightly
backup to the test system since both Prod nodes were so hosed.
This is bit one reason I like best-effort (asynchronous) dbms level
transaction replication. The remote is 30s behind but is in a consistent
state. Most users can handle checking if their last txn before crash
survived; most will even if not instructed to! (Even if asked not to!)
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