Storage

PaaS Cloud storage is built on LINSTOR with DRBD replication, providing distributed, high-availability block storage for workloads and virtual machines.

Storage Architecture

Component	Purpose
LINSTOR	Distributed storage management and volume provisioning
DRBD	Block-level replication across nodes for HA
LINSTOR CSI	Kubernetes CSI driver for dynamic volume provisioning
SeaweedFS / S3	Object storage for backups and unstructured data

Storage Classes

The following storage classes are typically available in PaaS Cloud:

Storage Class	Backend	Use Case
`replicated`	LINSTOR/DRBD (thin LVM)	Default for most workloads and VMs. Replicated across nodes for HA.
`local`	LINSTOR (thin LVM, local)	Local-only thin LVM without replication. Faster but not HA.

Specify the storage class when creating vm-disk resources or PVCs:

storageClass: replicated

vm-disk Storage

When you create a vm-disk, the underlying PVC is provisioned through LINSTOR CSI:

spec:
  pvc:
    storageClassName: replicated
    resources:
      requests:
        storage: 20Gi

The default size is 5Gi.
The default storage class is replicated.

Persistent Volumes for Applications

Marketplace applications that require persistent storage also use LINSTOR-backed PVCs. When deploying an application, you can specify:

Storage size — Requested capacity.
Storage class — Typically replicated for HA.

Disk Preparation

The platform team prepares physical disks for LINSTOR storage pools. This includes:

Creating LVM thin pools on physical devices.
Registering storage pools with LINSTOR.

Tenants do not need to manage physical disk preparation.

Encrypted Storage

LINSTOR supports encrypted volumes using LUKS. If your tenant requires encrypted storage, contact the cloud team to enable encryption on specific storage pools.

NFS

NFS shares can be consumed by workloads for shared file storage. Contact the cloud team if your application requires NFS access.

Object Storage (S3)

The platform provides object storage via SeaweedFS with an S3-compatible API. Common uses:

Application backups.
VM disk snapshots.
Large unstructured data.

Contact the cloud team for S3 endpoint details and credentials.

Troubleshooting

Problem	Cause	Solution
PVC stuck in Pending	No available storage pool or quota exceeded	Check tenant quotas and contact support.
Disk performance is low	Using `replicated` over slow network	For latency-sensitive workloads, request `lvm-thin` (local) storage class.
Disk full	Volume exceeded requested size	Resize the PVC or attach an additional `vm-disk`.

Storage

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