[Cinder] 存储 Qos

目录

文章目录

• 目录
• 前言
• 操作步骤
• 参考文章

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。

参考文章

Capacity based quality of service

https://blog.csdn.net/LL_JCB/article/details/80412362