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@@ -48,14 +48,25 @@ breadcrumbs:
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## Guidelines
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-- Use at least 3 nodes.
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-- CPU: Metadata servers and partially OSDs are somewhat CPU intensive. Monitors are not.
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-- RAM: OSDs should have ~1GB per 1TB storage, even though it typically doesn't use much.
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-- Use a replication factor of at least 3/2.
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-- Run OSes, OSD data and OSD journals on separate drives.
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+- Nodes:
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+ - 3+ required (1 can fail), 4+ recommended (2 can fail).
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+- CPU:
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+ - MDSes an somewhat OSDs are CPU intensive, but managers and monitors are not.
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+- RAM:
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+ - Depends, check the docs. More is better.
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+ - The recommended target for each OSD is 4GB. 2GB may work, but any less may cause extremely low performance.
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+- Disks:
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+ - Recommended minimum disk size is 1TB.
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+ - Behcnmark the drives before using them. See the docs.
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- Network:
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- Use an isolated separete physical network for internal cluster traffic between nodes.
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- Consider using 10G or higher with a spine-leaf topology.
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+- Disk setup:
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+ - SAS/SATA drives should have 1 OSD each, but NVMe drives may yield better performance if using multiple.
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+ - Use a replication factor of at least 3/2.
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+ - Run OSes, OSD data and OSD journals on separate drives.
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+ - Local, fast SSDs may be used for CephFS metadata pools, while keeping the file contents on the "main pool".
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+ - Consider disabling drive HW write caches, it might increase performance with Ceph.
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- Pool PG count:
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- \<5 OSDs: 128
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- 5-10 OSDs: 512
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Nordstrand