15 lines
760 B
Markdown
15 lines
760 B
Markdown
# Cluster-Wide Disk Layout Parameters
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These parameters apply to clients and OSDs, are fixed at the moment of OSD drive
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initialization and can't be changed after it without losing data.
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OSDs with different values of these parameters (for example, SSD and SSD+HDD
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OSDs) can coexist in one Vitastor cluster within different pools. Each pool can
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only include OSDs with identical settings of these parameters.
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These parameters, when set to a non-default value, must also be specified in
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etcd for clients to be aware of their values, either in /vitastor/config/global
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or in pool configuration. Pool configuration overrides the global setting.
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If the value for a pool in etcd doesn't match on-disk OSD configuration, the
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OSD will refuse to start PGs of that pool.
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