blktrace
18 Oct 2016使用blktrace跟踪系统IO路径，分析存储性能瓶颈。
用一个Cinder服务管理多个后端存储器或存储池。在多后端配置中，每个后端都有一个名字（volume_backend_name），通过这个名字与云硬盘类型关联。名字相同时，由调度器决定在哪个后端创建卷。
默认配置为/etc/cinder/cinder.conf
enabled_backends=cinder_ceph1,cinder_vmware1
[cinder_ceph1]
volume_driver=cinder.volume.drivers.rbd.RBDDriver
volume_backend_name=cinder_ceph1
rbd_pool = volumes
rbd_ceph_conf = /etc/ceph/ceph.conf
rbd_flatten_volume_from_snapshot = false
rbd_max_clone_depth = 5
rbd_store_chunk_size = 4
rados_connect_timeout = -1
glance_api_version = 2
rbd_user = cinder
rbd_secret_uuid = 457eb676-33da-42ec-9a8c-9293d545c337
[cinder_vmware1]
volume_driver=cinder.volume.drivers.vmware.vmdk.VMwareVcVmdkDriver
volume_backend_name=cinder_vmware1
vmware_host_ip=172.16.11.200
vmware_host_username=root
vmware_host_password=xxxxxx
vmware_api_retry_count=10
vmware_volume_folder=datastore1
# Which filter class names to use for filtering hosts when not
# specified in the request. (list value)
#scheduler_default_filters=AvailabilityZoneFilter,CapacityFilter,CapabilitiesFilter
# Which weigher class names to use for weighing hosts. (list
# value)
#scheduler_default_weighers=CapacityWeigher
创建云硬盘类型并与相应的存储后端关联
[root@controller ~]# source admin-openrc.sh
[root@controller ~]# cinder --os-username admin --os-tenant-name admin type-create ceph1
[root@controller ~]# cinder --os-username admin --os-tenant-name admin type-key ceph1 set volume_backend_name=cinder_ceph1
[root@controller ~]# cinder --os-username admin --os-tenant-name admin type-create vmware1
[root@controller ~]# cinder --os-username admin --os-tenant-name admin type-key vmware1 set volume_backend_name=cinder_vmware1
查看类型的额外属性
[root@controller ~]# cinder --os-username admin --os-tenant-name admin extra-specs-list
+--------------------------------------+---------+---------------------------------------------+
| ID | Name | extra_specs |
+--------------------------------------+---------+---------------------------------------------+
| 0bc8497c-7461-4e0d-b467-4fdf33561c44 | vmware1 | {u'volume_backend_name': u'cinder_vmware1'} |
| 53eeca13-af22-4b80-9631-1f1c8882788e | ceph1 | {u'volume_backend_name': u'cinder_ceph1'} |
| bac77519-7c12-48cb-bac7-563d280f2a78 | xsxsxx | {} |
+--------------------------------------+---------+---------------------------------------------+
创建云硬盘时指定类型
[root@controller ~]# cinder create --display-name test --volume-type ceph1 1
+---------------------+--------------------------------------+
| Property | Value |
+---------------------+--------------------------------------+
| attachments | [] |
| availability_zone | cinder |
| bootable | false |
| created_at | 2015-11-20T08:36:20.908686 |
| display_description | None |
| display_name | test |
| encrypted | False |
| id | 97f64d3e-a774-4a24-9f60-7e4fc99ad03b |
| metadata | {} |
| size | 1 |
| snapshot_id | None |
| source_volid | None |
| status | creating |
| volume_type | ceph1 |
+---------------------+--------------------------------------+