Skip to content

K8s: add info on default PVC size #2000

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
wants to merge 2 commits into
base: main
Choose a base branch
from
+10 −0
Open

K8s: add info on default PVC size #2000

Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
abe18bc
add info on default PVC size
kaitlynmichael Aug 15, 2025
e47fd78
memory omitted option
kaitlynmichael Aug 18, 2025
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
10 changes: 10 additions & 0 deletions content/operate/kubernetes/re-clusters/expand-pvc.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,16 @@ This process involves deleting and recreating the REC StatefulSet with a larger

{{<note>}}Shrinking (reducing the size) of your PVC is not allowed. This process only allows you to expand (size up) your PVC.{{</note>}}

### Default PVC size

By default, if you omit [`spec.persistentSpec.volumeSize`]({{< relref "/operate/kubernetes/reference/api/redis_enterprise_cluster_api#specpersistentspec" >}}), the operator allocates a persistent volume that is five times (5x) the Redis Enterprise node memory request defined in [`spec.redisEnterpriseNodeResources.requests.memory`]({{< relref "/operate/kubernetes/reference/api/redis_enterprise_cluster_api#specredisenterprisenoderesources" >}}) (per node). This 5x ratio is the recommended minimum capacity.

- If you set [`spec.persistentSpec.volumeSize`]({{< relref "/operate/kubernetes/reference/api/redis_enterprise_cluster_api#specpersistentspec" >}}) explicitly, that exact size is used and the 5x default does not apply.
- Changing node memory requests does not automatically resize existing PVCs. Use the procedure below to expand the PVC if you want to maintain the 5x ratio after changing memory.
- If you omit [`spec.redisEnterpriseNodeResources.requests.memory`]({{< relref "/operate/kubernetes/reference/api/redis_enterprise_cluster_api#specredisenterprisenoderesources" >}}), the operator uses its default memory request (4Gi). With `volumeSize` omitted, this results in a default PVC size of approximately 20Gi per node (5 × 4Gi). See [sizing on Kubernetes]({{< relref "/operate/kubernetes/recommendations/sizing-on-kubernetes" >}}) for defaults.

- See the [volume size recommendations]({{< relref "/operate/kubernetes/recommendations/persistent-volumes#volume-size" >}}) and [hardware requirements]({{< relref "/operate/rs/installing-upgrading/install/plan-deployment/hardware-requirements" >}}) for guidance.

## Prerequisites

{{<warning>}}Do not change any other REC fields related to the StatefulSet while resizing is in progress.
Expand Down