[enterprise-4.7] GH#35793 Update storage requirements for all providers from 120GB -> 100GB

modules/installation-requirements-user-infra-ibm-z-kvm.adoc

@@ -87,36 +87,41 @@ On your {op-system-base} KVM host, set up:
 
 Each cluster virtual machine must meet the following minimum requirements:
 
-[cols="2,2,2,2,2",options="header"]
+[cols="2,2,2,2,2,2",options="header"]
 |===
 
 |Virtual Machine
 |Operating System
 |vCPU ^[1]^
 |Virtual RAM
 |Storage
+|IOPS
 
 |Bootstrap
 |{op-system}
 |4
 |16 GB
-|120 GB
+|100 GB
+|N/A
 
 |Control plane
 |{op-system}
 |4
 |16 GB
-|120 GB
+|100 GB
+|N/A
 
 |Compute
 |{op-system}
 |2
 |8 GB
-|120 GB
+|100 GB
+|N/A
 
 |===
+[.small]
 --
-^[1]^ 1 physical core (IFL) provides 2 logical cores (threads) when SMT-2 is enabled. The hypervisor can provide 2 or more vCPUs.
+1. One physical core (IFL) provides two logical cores (threads) when SMT-2 is enabled. The hypervisor can provide two or more vCPUs.
 --
 
 [id="preferred-ibm-z-system-requirements_{context}"]

modules/installation-requirements-user-infra.adoc

@@ -139,53 +139,85 @@ 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
 |Operating System
 |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
 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[]
 |Compute
 |{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]
 --
 ifdef::ibm-z[]
-1. 1 physical core (IFL) provides 2 logical cores (threads) when SMT-2 is enabled. The hypervisor can provide 2 or more vCPUs.
+1. One physical core (IFL) provides two logical cores (threads) when SMT-2 is enabled. The hypervisor can provide two or more vCPUs.
 endif::ibm-z[]
 ifndef::ibm-z[]
-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.
+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[]
 --
 
@@ -303,9 +335,9 @@ On your IBM Power instance, set up:
 [discrete]
 === Storage / main memory
 
-* 120 GB / 16 GB for {product-title} control plane machines
-* 120 GB / 8 GB for {product-title} compute machines
-* 120 GB / 16 GB for the temporary {product-title} bootstrap machine
+* 100 GB / 16 GB for {product-title} control plane machines
+* 100 GB / 8 GB for {product-title} compute machines
+* 100 GB / 16 GB for the temporary {product-title} bootstrap machine
 
 [id="recommended-ibm-Power-system-requirements_{context}"]