Storage options on Google Cloud Platform
Read write once (RWO) block disk storage
OpenShift 4 brings along a storage provisioner which taps into the disk storage offering of the Google Compute Engine. The following storage classes are provided:
| standard |
Zonal standard persistent disks—Efficient and reliable block storage |
| regional |
Regional standard persistent disks—Efficient and reliable block storage with synchronous replication across two zones in a region |
| ssd |
Zonal SSD persistent disks—Fast and reliable block storage |
| regional-ssd |
Regional SSD persistent disks—Fast and reliable block storage with synchronous replication across two zones in a region |
Check Google Compute Engine Storage Options for the details on that storage.
Check Google Compute Engine Disk Pricing for the pricing of the storage options.
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Standard class
If a PersistentVolumeClaim doesn’t request for a StorageClass explicitly, the StorageClass |
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Minimum capacity per disk
The Google documentation of Storage options, mentions a minimum capacity per disk. This isn’t enforced but it directly has impact on the performace of that disk. |
Read write many (RWX) file storage
| Use of Cloud Storage is preferred. It’s the more reliable and cost effective solution. |
| The following is only available on request. |
Filestore is the Google Cloud service for a file storage. Files stored in Filestore can be read and written from several sources at the same time.
Filestore can by used by OpenShift in two ways: a single instance which is shared across all PersistentVolumes of a StorageClass or an instance for each PersistentVolume.
A single Filestore instance will be created. Since Filestore makes files accessible by NFSv3, the NFS Client Provisioner can then be leveraged. The provisioner will create a subdirectory for each PersistentVolume.
The GCP Filestore CSI Driver allows to have a Filestore instance provisioned for each requested PersistentVolume.
Check the Cloud Filestore Pricing for the attached price tag.
| The minimal size of a Filestore instance is 1TB for HDD and 2.5TB for SSD. |