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Diffstat (limited to 'doc/start/hardware-recommendations.rst')
| -rw-r--r-- | doc/start/hardware-recommendations.rst | 15 |
1 files changed, 7 insertions, 8 deletions
diff --git a/doc/start/hardware-recommendations.rst b/doc/start/hardware-recommendations.rst index 823deb9b0c3..3d5e44d8e02 100644 --- a/doc/start/hardware-recommendations.rst +++ b/doc/start/hardware-recommendations.rst @@ -22,13 +22,12 @@ another, but below are some general guidelines. CPU === -CephFS Metadata Servers (MDS) are CPU-intensive. They are -are single-threaded and perform best with CPUs with a high clock rate (GHz). MDS -servers do not need a large number of CPU cores unless they are also hosting other -services, such as SSD OSDs for the CephFS metadata pool. -OSD nodes need enough processing power to run the RADOS service, to calculate data -placement with CRUSH, to replicate data, and to maintain their own copies of the -cluster map. +CephFS Metadata Servers (MDS) are CPU-intensive. They are single-threaded +and perform best with CPUs with a high clock rate (GHz). MDS servers do not +need a large number of CPU cores unless they are also hosting other services, +such as SSD OSDs for the CephFS metadata pool. OSD nodes need enough +processing power to run the RADOS service, to calculate data placement with +CRUSH, to replicate data, and to maintain their own copies of the cluster map. With earlier releases of Ceph, we would make hardware recommendations based on the number of cores per OSD, but this cores-per-osd metric is no longer as @@ -312,7 +311,7 @@ media cost. Moreover, when using NVMe SSDs, you do not need *any* HBA. This additionally reduces the HDD vs SSD cost gap when the system as a whole is considered. The initial cost of a fancy RAID HBA plus onboard cache plus battery backup (BBU or supercapacitor) can easily exceed more than 1000 US -dollars even after discounts - a sum that goes a log way toward SSD cost parity. +dollars even after discounts - a sum that goes a long way toward SSD cost parity. An HBA-free system may also cost hundreds of US dollars less every year if one purchases an annual maintenance contract or extended warranty. |