diff --git a/modules/installation-requirements-user-infra.adoc b/modules/installation-requirements-user-infra.adoc
index d54318bf931c..35d0bac71866 100644
--- a/modules/installation-requirements-user-infra.adoc
+++ b/modules/installation-requirements-user-infra.adoc
@@ -129,7 +129,7 @@ endif::ibm-z[]
 
 Each cluster machine must meet the following minimum requirements:
 
-[cols="2,2,2,2,2",options="header"]
+[cols="2,2,2,2,2,2",options="header"]
 |===
 
 |Machine
@@ -137,20 +137,39 @@ Each cluster machine must meet the following minimum requirements:
 |vCPU ^[1]^
 |Virtual RAM
 |Storage
+ifndef::ibm-z[]
+|IOPS ^[2]^
+endif::ibm-z[]
+ifdef::ibm-z[]
+|IOPS
+endif::ibm-z[]
 
 |Bootstrap
 |{op-system}
 ifdef::ibm-power[|2]
 ifndef::ibm-power[|4]
 |16 GB
-|120 GB
+|100 GB
+ifndef::ibm-z[]
+|300
+endif::ibm-z[]
+ifdef::ibm-z[]
+|N/A
+endif::ibm-z[]
+
 
 |Control plane
 |{op-system}
 ifdef::ibm-power[|2]
 ifndef::ibm-power[|4]
 |16 GB
-|120 GB
+|100 GB
+ifndef::ibm-z[]
+|300
+endif::ibm-z[]
+ifdef::ibm-z[]
+|N/A
+endif::ibm-z[]
 
 ifndef::openshift-origin[]
 |Compute
@@ -158,7 +177,13 @@ ifdef::ibm-z,ibm-power[|{op-system}]
 ifndef::ibm-z,ibm-power[|{op-system} or RHEL 7.9]
 |2
 |8 GB
-|120 GB
+|100 GB
+ifndef::ibm-z[]
+|300
+endif::ibm-z[]
+ifdef::ibm-z[]
+|N/A
+endif::ibm-z[]
 endif::openshift-origin[]
 
 ifdef::openshift-origin[]
@@ -167,12 +192,24 @@ ifdef::ibm-z,ibm-power[|{op-system}]
 ifndef::ibm-z,ibm-power[|{op-system}]
 |2
 |8 GB
-|120 GB
+|100 GB
+ifndef::ibm-z[]
+|300
+endif::ibm-z[]
+ifdef::ibm-z[]
+|N/A
+endif::ibm-z[]
 endif::openshift-origin[]
 |===
 [.small]
 --
-1. 1 vCPU is equivalent to 1 physical core when simultaneous multithreading (SMT), or hyperthreading, is not enabled. When enabled, use the following formula to calculate the corresponding ratio: (threads per core × cores) × sockets = vCPUs.
+ifdef::ibm-z[]
+1. One vCPU is equivalent to one physical core when simultaneous multithreading (SMT), or hyperthreading, is not enabled. When enabled, use the following formula to calculate the corresponding ratio: (threads per core × cores) × sockets = vCPUs.
+endif::ibm-z[]
+ifndef::ibm-z[]
+1. One vCPU is equivalent to one physical core when simultaneous multithreading (SMT), or hyperthreading, is not enabled. When enabled, use the following formula to calculate the corresponding ratio: (threads per core × cores) × sockets = vCPUs.
+2. {product-title} and Kubernetes are sensitive to disk performance, and faster storage is recommended, particularly for etcd on the control plane nodes which require a 10 ms p99 fsync duration. Note that on many cloud platforms, storage size and IOPS scale together, so you might need to over-allocate storage volume to obtain sufficient performance.
+endif::ibm-z[]
 --
 
 ifdef::ibm-z[]