- * If this is not a failfast write, and we were able to
- * write enough columns to reconstruct the data, good enough.
+ * XXX -- for now, treat partial writes as a success.
+ * (If we couldn't write enough columns to reconstruct
+ * the data, the I/O failed. Otherwise, good enough.)
+ *
+ * Now that we support write reallocation, it would be better
+ * to treat partial failure as real failure unless there are
+ * no non-degraded top-level vdevs left, and not update DTLs
+ * if we intend to reallocate.