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在nova availability zone中创建 fast-io host aggregate
$ nova aggregate-create fast-io nova +----+---------+-------------------+-------+----------+ | Id | Name | Availability Zone | Hosts | Metadata | +----+---------+-------------------+-------+----------+ | 1 | fast-io | nova | | | +----+---------+-------------------+-------+----------+
添加ssd=true key-value pair to the aggregate
$ nova aggregate-set-metadata 1 ssd=true +----+---------+-------------------+-------+-------------------+ | Id | Name | Availability Zone | Hosts | Metadata | +----+---------+-------------------+-------+-------------------+ | 1 | fast-io | nova | [] | {u‘ssd‘: u‘true‘} | +----+---------+-------------------+-------+-------------------+
把node1/2添加到aggregate
$ nova aggregate-add-host 1 node1 +----+---------+-------------------+-----------+-------------------+ | Id | Name | Availability Zone | Hosts | Metadata | +----+---------+-------------------+------------+-------------------+ | 1 | fast-io | nova | [u‘node1‘] | {u‘ssd‘: u‘true‘} | +----+---------+-------------------+------------+-------------------+ $ nova aggregate-add-host 1 node2 +----+---------+-------------------+---------------------+-------------------+ | Id | Name | Availability Zone | Hosts | Metadata | +----+---------+-------------------+----------------------+-------------------+ | 1 | fast-io | nova | [u‘node1‘, u‘node2‘] | {u‘ssd‘: u‘true‘} | +----+---------+-------------------+----------------------+-------------------+
创建ssd.large flavor， ID of 6, 8 GB of RAM, 80 GB root disk, and four vCPUs.
$ nova flavor-create ssd.large 6 8192 80 4 +----+-----------+-----------+------+-----------+------+-------+-------------+-----------+ | ID | Name | Memory_MB | Disk | Ephemeral | Swap | VCPUs | RXTX_Factor | Is_Public | +----+-----------+-----------+------+-----------+------+-------+-------------+-----------+ | 6 | ssd.large | 8192 | 80 | 0 | | 4 | 1.0 | True | +----+-----------+-----------+------+-----------+------+-------+-------------+-----------+
设置aggregate_instance_extra_specs filter的key-value pairs:
$ nova flavor-keyssd.largesetaggregate_instance_extra_specs:ssd=true
该filter的实现在：nova/scheduler/filters/aggregate_instance_extra_specs.py
$ nova flavor-show ssd.large +----------------------------+--------------------------------------------------+ | Property | Value | +----------------------------+--------------------------------------------------+ | OS-FLV-DISABLED:disabled | False | | OS-FLV-EXT-DATA:ephemeral | 0 | | disk | 80 | | extra_specs | {u‘aggregate_instance_extra_specs:ssd‘: u‘true‘} | | id | 6 | | name | ssd.large | | os-flavor-access:is_public | True | | ram | 8192 | | rxtx_factor | 1.0 | | swap | | | vcpus | 4 | +----------------------------+--------------------------------------------------+
现在使用ssd.large flavor来创建instance时，scheduler 只会考虑带有ssd=true key-value pair的host，也就是node1/2.
http://docs.openstack.org/liberty/config-reference/content/section_compute-scheduler.html
Specify compute hosts with SSDs
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原文地址：http://www.cnblogs.com/allcloud/p/5020296.html
