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107 lines
5.8 KiB
ReStructuredText
==========================
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Hardware Recommendations
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==========================
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Ceph runs on commodity hardware and a Linux operating system over a TCP/IP
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network. The hardware recommendations for different processes/daemons differ
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considerably.
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* **OSDs:** OSD hosts should have ample data storage in the form of a hard drive
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or a RAID. Ceph OSDs run the RADOS service, calculate data placement with
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CRUSH, and maintain their own copy of the cluster map. Therefore, OSDs
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should have a reasonable amount of processing power.
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* **Monitors:** Ceph monitor hosts require enough disk space for the cluster map,
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but usually do not encounter heavy loads. Monitor hosts do not need to be
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very powerful.
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* **Metadata Servers:** Ceph metadata servers distribute their load. However,
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metadata servers must be capable of serving their data quickly. Metadata
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servers should have strong processing capability and plenty of RAM.
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.. note:: If you are not using the Ceph File System, you do not need a meta data server.
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Minimum Hardware Recommendations
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================================
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Ceph can run on inexpensive commodity hardware. Small production clusters
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and development clusters can run successfully with modest hardware.
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+--------------+----------------+------------------------------------+
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| Process | Criteria | Minimum Recommended |
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+==============+================+====================================+
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| ``ceph-osd`` | Processor | 64-bit AMD-64/i386 dual-core |
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| +----------------+------------------------------------+
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| | RAM | 500 MB per daemon |
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| +----------------+------------------------------------+
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| | Volume Storage | 1-disk or RAID per daemon |
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| +----------------+------------------------------------+
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| | Network | 2-1GB Ethernet NICs |
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+--------------+----------------+------------------------------------+
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| ``ceph-mon`` | Processor | 64-bit AMD-64/i386 |
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| +----------------+------------------------------------+
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| | RAM | 1 GB per daemon |
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| +----------------+------------------------------------+
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| | Disk Space | 10 GB per daemon |
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| +----------------+------------------------------------+
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| | Network | 2-1GB Ethernet NICs |
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+--------------+----------------+------------------------------------+
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| ``ceph-mds`` | Processor | 64-bit AMD-64/i386 quad-core |
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| +----------------+------------------------------------+
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| | RAM | 1 GB minimum per daemon |
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| +----------------+------------------------------------+
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| | Disk Space | 1 MB per daemon |
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| +----------------+------------------------------------+
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| | Network | 2-1GB Ethernet NICs |
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+--------------+----------------+------------------------------------+
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.. important: If you are running an OSD with a single disk, create a
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partition for your volume storage that is separate from the partition
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containing the OS. Generally, we recommend separate disks for the
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OS and the volume storage.
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Production Cluster Example
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==========================
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Production clusters for petabyte scale data storage may also use commodity
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hardware, but should have considerably more memory, processing power and data
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storage to account for heavy traffic loads.
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A recent (2012) Ceph cluster project is using two fairly robust hardware
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configurations for Ceph OSDs, and a lighter configuration for monitors.
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+----------------+----------------+------------------------------------+
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| Configuration | Criteria | Minimum Recommended |
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+================+================+====================================+
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| Dell PE R510 | Processor | 2 64-bit quad-core Xeon CPUs |
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| +----------------+------------------------------------+
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| | RAM | 16 GB |
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| +----------------+------------------------------------+
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| | Volume Storage | 8-2TB drives. 1-OS 7-Storage |
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| +----------------+------------------------------------+
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| | Client Network | 2-1GB Ethernet NICs |
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| +----------------+------------------------------------+
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| | OSD Network | 2-1GB Ethernet NICs |
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| +----------------+------------------------------------+
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| | NIC Mgmt. | 2-1GB Ethernet NICs |
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+----------------+----------------+------------------------------------+
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| Dell PE R515 | Processor | 1 hex-core Opteron CPU |
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| +----------------+------------------------------------+
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| | RAM | 16 GB |
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| +----------------+------------------------------------+
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| | Volume Storage | 12-3TB drives. Storage |
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| +----------------+------------------------------------+
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| | OS Storage | 1-500GB drive. Operating System. |
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| +----------------+------------------------------------+
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| | Client Network | 2-1GB Ethernet NICs |
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| +----------------+------------------------------------+
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| | OSD Network | 2-1GB Ethernet NICs |
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| +----------------+------------------------------------+
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| | NIC Mgmt. | 2-1GB Ethernet NICs |
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+----------------+----------------+------------------------------------+
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