(DOCSP-25236) Adds known issue for long IOPS wait times. (#1382)

* (DOCSP-25236) Adds known issue for long IOPS wait times.

* Adds link per copy review.

Author: erabil-mdb

source/reference/known-issues.txt

@@ -10,6 +10,18 @@ Known Issues in the |k8s-op-full|
    :depth: 1
    :class: singlecol
 
+Underprovisioned EBS Volume Causes Long IOPS Wait Times
+-------------------------------------------------------
+
+If you used `kops <https://kops.sigs.k8s.io/>`__ to provision a |K8s| cluster in |AWS| and
+are experiencing poor performance and high |iops| wait times, your Elastic Block Store
+(EBS) volume may be underprovisioned. 
+
+To improve performance, increase the storage-to-IOPS ratio for your EBS volume. For
+example, if your database is 500 GB, increase IOPS to 1500, a 3:1 ratio per GB. To learn 
+more about increasing IOPS, see the
+:aws:`AWS documentation </AWSEC2/latest/UserGuide/requesting-ebs-volume-modifications.html>`.
+
 .. _hardcoded_configmap_multi-clusters:
 
 ConfigMap Name ``mongodb-enterprise-operator-member-list`` is Hard-Coded