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50 lines
1.6 KiB
ReStructuredText
50 lines
1.6 KiB
ReStructuredText
==========================
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iSCSI Gateway Requirements
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==========================
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To implement the Ceph iSCSI gateway there are a few requirements. It is recommended
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to use two to four iSCSI gateway nodes for a highly available Ceph iSCSI gateway
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solution.
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For hardware recommendations, see the `Hardware Recommendation page <http://docs.ceph.com/docs/master/start/hardware-recommendations/>`_
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for more details.
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.. note::
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On the iSCSI gateway nodes, the memory footprint of the RBD images
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can grow to a large size. Plan memory requirements accordingly based
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off the number RBD images mapped.
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There are no specific iSCSI gateway options for the Ceph Monitors or
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OSDs, but it is important to lower the default timers for detecting
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down OSDs to reduce the possibility of initiator timeouts. The following
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configuration options are suggested for each OSD node in the storage
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cluster::
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[osd]
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osd heartbeat grace = 20
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osd heartbeat interval = 5
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- Online Updating Using the Ceph Monitor
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::
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ceph tell <daemon_type>.<id> injectargs '--<parameter_name> <new_value>'
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::
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ceph tell osd.0 injectargs '--osd_heartbeat_grace 20'
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ceph tell osd.0 injectargs '--osd_heartbeat_interval 5'
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- Online Updating on the OSD Node
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::
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ceph daemon <daemon_type>.<id> config set osd_client_watch_timeout 15
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::
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ceph daemon osd.0 config set osd_heartbeat_grace 20
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ceph daemon osd.0 config set osd_heartbeat_interval 5
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For more details on setting Ceph's configuration options, see the `Configuration page <http://docs.ceph.com/docs/master/rados/configuration/>`_.
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