public DiskStoreID getDiskStoreId() {
    return diskStoreId;
  }
Indicate that this persistent member id is from the same disk store, and is older than, or
equal to, the passed in disk store.

This is an older version if it has an older timestamp, or the same timestamp and an older
version
geode-core/src/main/java/org/apache/geode/internal/cache/persistence/PersistentMemberID.java