目录
文章目录
前言
Cinder 支持 front-end 和 back-end 两种类型的存储 QoS，前者由 Hypervisor 端实现（e.g. 通过 Libvirt 设置虚拟机的存储 QoS），后者指存储设备上设置的 QoS，需要存储设备支持。 一般的物理存储设备都会支持 QoS，但 SDS 的 Ceph RBD 不支持，所以使用 Ceph 存储方案的用户一般只能使用 front-end Qos 来限制虚拟机对数据盘的 Qos。
QoS 项目：
- total_bytes_sec - the total allowed bandwidth for the guest per second
- read_bytes_sec - sequential read limitation
- write_bytes_sec - sequential write limitation
- total_iops_sec - the total allowed IOPS for the guest per second
- read_iops_sec - random read limitation
- write_iops_sec - random write limitation
操作步骤
通过 openstackclient 创建具有 QoS Policy 的 Volume Type：
[stack@manager ~]$ openstack volume type create VolumeType1 +---------------------------------+--------------------------------------+ | Field | Value | +---------------------------------+--------------------------------------+ | description | None | | id | ae5359b3-0bbc-4104-88ca-3749eab07cc8 | | is_public | True | | name | VolumeType1 | | os-volume-type-access:is_public | True | +---------------------------------+--------------------------------------+ [stack@manager ~]$ openstack volume type show VolumeType1 +---------------------------------+--------------------------------------+ | Field | Value | +---------------------------------+--------------------------------------+ | access_project_ids | None | | description | None | | id | ae5359b3-0bbc-4104-88ca-3749eab07cc8 | | is_public | True | | name | VolumeType1 | | os-volume-type-access:is_public | True | | properties | | | qos_specs_id | None | +---------------------------------+--------------------------------------+ [stack@manager ~]$ openstack volume qos create qos1 --consumer front-end --property total_iops_sec=200 +----------+--------------------------------------+ | Field | Value | +----------+--------------------------------------+ | consumer | front-end | | id | 05ab9096-3a0f-45d8-acb8-f0cac172ae8c | | name | qos1 | | specs | {u'total_iops_sec': u'200'} | +----------+--------------------------------------+ [stack@manager ~]$ openstack volume qos set --property total_bytes_sec=2048000 qos1 [stack@manager ~]$ openstack volume qos associate qos1 VolumeType1 指定 VolumeType 创建 Volume：
[stack@manager ~]$ openstack volume create --type VolumeType1 --size 1 volume1 +---------------------+--------------------------------------+ | Field | Value | +---------------------+--------------------------------------+ | attachments | [] | | availability_zone | nova | | bootable | false | | consistencygroup_id | None | | created_at | 2018-12-26T13:51:22.597699 | | description | None | | encrypted | False | | id | c24e2a9e-1792-4951-a040-434b87409558 | | migration_status | None | | multiattach | False | | name | volume1 | | properties | | | replication_status | disabled | | size | 1 | | snapshot_id | None | | source_volid | None | | status | creating | | type | VolumeType1 | | updated_at | None | | user_id | 11b816e454384d038472c7c89d2544f4 | +---------------------+--------------------------------------+ [stack@manager ~]$ openstack volume list +--------------------------------------+--------------+-----------+------+-------------+ | ID | Display Name | Status | Size | Attached to | +--------------------------------------+--------------+-----------+------+-------------+ | c24e2a9e-1792-4951-a040-434b87409558 | volume1 | available | 1 | | +--------------------------------------+--------------+-----------+------+-------------+
查看 Libvirt 虚拟机的 XML 文件内容，disk 标签具有 QoS 属性 <iotune>：
[root@overcloud-compute-0 ~]# virsh dumpxml 1 ... <disk type='block' device='disk'> <driver name='qemu' type='raw' cache='none' io='native'/> <source dev='/dev/sdd'/> <backingStore/> <target dev='vdb' bus='virtio'/> <iotune> <total_iops_sec>200</total_iops_sec> <total_bytes_sec>2048000</total_bytes_sec> </iotune> <serial>c24e2a9e-1792-4951-a040-434b87409558</serial> <alias name='virtio-disk1'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/> </disk>
通过 virsh 设定 Libvirt 虚拟机的 QoS 属性：
[root@overcloud-compute-0 ~]# virsh blkdeviotune 1 vdb --total_iops_sec 100 [root@overcloud-compute-0 ~]# virsh blkdeviotune 1 vdb --total-bytes-sec 1024000 [root@overcloud-compute-0 ~]# virsh dumpxml 1 ... <disk type='block' device='disk'> <driver name='qemu' type='raw' cache='none' io='native'/> <source dev='/dev/sdd'/> <backingStore/> <target dev='vdb' bus='virtio'/> <iotune> <total_bytes_sec>1024000</total_bytes_sec> <total_iops_sec>100</total_iops_sec> </iotune> <serial>c24e2a9e-1792-4951-a040-434b87409558</serial> <alias name='virtio-disk1'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/> </disk>
NOTE：Qos 一般来说都是在一个建议值上下浮动的，所以可以通过指定 --total-iops-sec-max 来固定上限。
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