3.4. Requirements for deploying Red Hat Ceph Storage stretch cluster with arbiter
Red Hat Ceph Storage is an open-source enterprise platform that provides unified software-defined storage on standard, economical servers and disks. With block, object, and file storage combined into one platform, Red Hat Ceph Storage efficiently and automatically manages all your data, so you can focus on the applications and workloads that use it.
This section provides a basic overview of the Red Hat Ceph Storage deployment. For more complex deployment, refer to the official documentation guide for Red Hat Ceph Storage 6.1.
Only Flash media is supported since it runs with min_size=1 when degraded. Use stretch mode only with all-flash OSDs. Using all-flash OSDs minimizes the time needed to recover once connectivity is restored, thus minimizing the potential for data loss.
Erasure coded pools cannot be used with stretch mode.
3.4.1. Hardware requirements
For information on minimum hardware requirements for deploying Red Hat Ceph Storage, see Minimum hardware recommendations for containerized Ceph.
| Node name | Datacenter | Ceph components |
|---|---|---|
| ceph1 | DC1 | OSD+MON+MGR |
| ceph2 | DC1 | OSD+MON |
| ceph3 | DC1 | OSD+MDS+RGW |
| ceph4 | DC2 | OSD+MON+MGR |
| ceph5 | DC2 | OSD+MON |
| ceph6 | DC2 | OSD+MDS+RGW |
| ceph7 | DC3 | MON |
3.4.2. Software requirements
Use the latest software version of Red Hat Ceph Storage 6.1.
For more information on the supported Operating System versions for Red Hat Ceph Storage, see Compatibility Matrix for Red Hat Ceph Storage.
3.4.3. Network configuration requirements
The recommended Red Hat Ceph Storage configuration is as follows:
- You must have two separate networks, one public network and one private network.
You must have three different datacenters that support VLANS and subnets for Cephs private and public network for all datacenters.
注意You can use different subnets for each of the datacenters.
- The latencies between the two datacenters running the Red Hat Ceph Storage Object Storage Devices (OSDs) cannot exceed 10 ms RTT. For the arbiter datacenter, this was tested with values as high up to 100 ms RTT to the other two OSD datacenters.
Here is an example of a basic network configuration that we have used in this guide:
- DC1: Ceph public/private network: 10.0.40.0/24
- DC2: Ceph public/private network: 10.0.40.0/24
- DC3: Ceph public/private network: 10.0.40.0/24
For more information on the required network environment, see Ceph network configuration.
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