diff --git a/environments/tuned-ceph-filestore-hci.yaml b/environments/tuned-ceph-filestore-hci.yaml
new file mode 100644
index 0000000000..dac8bf10d3
--- /dev/null
+++ b/environments/tuned-ceph-filestore-hci.yaml
@@ -0,0 +1,13 @@
+parameter_defaults:
+  # Reduce memory contention when collocating Nova compute and Ceph
+  # OSD services (HCI). For use with Ceph filestore, not bluestore.
+  TunedCustomProfile: |
+    [main]
+    summary=ceph-osd Filestore tuned profile
+    include=throughput-performance
+    [sysctl]
+    vm.dirty_ratio = 10
+    vm.dirty_background_ratio = 3
+    [sysfs]
+    /sys/kernel/mm/ksm/run=0
+  TunedProfileName: ceph-filestore-osd-hci
diff --git a/puppet/services/tuned.yaml b/puppet/services/tuned.yaml
index f1903e5eab..d308c2dece 100644
--- a/puppet/services/tuned.yaml
+++ b/puppet/services/tuned.yaml
@@ -36,6 +36,17 @@ parameters:
     type: string
     tags:
       - role_specific
+  TunedCustomProfile:
+    default: ''
+    description: The definition of a new tuned profile in INI format which
+                 will be named after the TunedProfileName and applied to the
+                 host. E.g. if TunedProfileName is 'my_profile', it creates
+                 the file '/etc/tuned/my_profile/tuned.conf' on host whose
+                 content is the value of TunedCustomProfile, e.g. "[main]\n
+                 include=throughput-performance\n[sysctl]\nvm.dirty_ratio=10"
+    type: string
+    tags:
+      - role_specific
 
 outputs:
   role_data:
@@ -46,7 +57,9 @@ outputs:
         map_replace:
           - map_replace:
             - tripleo::profile::base::tuned::profile: TunedProfileName
+              tripleo::profile::base::tuned::custom_profile: TunedCustomProfile
             - values: {get_param: RoleParameters}
-          - values: {'TunedProfileName': {get_param: TunedProfileName}}
+          - values: {'TunedProfileName': {get_param: TunedProfileName},
+                     'TunedCustomProfile': {get_param: TunedCustomProfile}}
       step_config: |
         include ::tripleo::profile::base::tuned
diff --git a/releasenotes/notes/tuned_custom_profile-25d1f4a2bc217216.yaml b/releasenotes/notes/tuned_custom_profile-25d1f4a2bc217216.yaml
new file mode 100644
index 0000000000..7e8053858e
--- /dev/null
+++ b/releasenotes/notes/tuned_custom_profile-25d1f4a2bc217216.yaml
@@ -0,0 +1,15 @@
+---
+features:
+  - |
+    Add new TunedCustomProfile parameter which may contain a string
+    in INI format describing a custom tuned profile. Also provide a
+    new environment file for users of hypercoverged Ceph deployments
+    using the Ceph filestore storage backened. The tuned profile is
+    based on heavy I/O load testing. The provided environment file
+    creates /etc/tuned/ceph-filestore-osd-hci/tuned.conf and sets
+    this tuned profile to be active. Not intended for use with Ceph
+    bluestore.
+fixes:
+  - |
+    CephOSD/Compute nodes crash under memory pressure unless custom tuned profile is used
+    (`bug 1800232 <https://bugs.launchpad.net/tripleo/+bug/1800232>`__).
\ No newline at end of file