DISKPREDICTION MODULE

磁盘预测模块支持两种模式：cloud mode和local mode。在cloud mode下，磁盘和Ceph操作状态信息是从Ceph群集中收集的，并通过Internet发送到基于云的DiskPrediction服务器。 DiskPrediction服务器分析数据，并提供Ceph群集的性能和磁盘运行状况的分析和预测结果。

local mode不需要任何外部服务器即可进行数据分析和输出结果。在local mode下，磁盘diskprediction module将内部predictor module用于磁盘预测服务，然后将磁盘预测结果返回给Ceph系统。

Local predictor: 70% 的准确性

Cloud predictor for free: 95% 的准确性

ENABLING

运行以下命令以在Ceph环境中启用磁盘预测模块：

1 2	ceph mgr module enable diskprediction_cloud ceph mgr module enable diskprediction_local

选择预测模式：

1	ceph config set global device_failure_prediction_mode local

或

1	ceph config set global device_failure_prediction_mode cloud

要禁用预测，请执行以下操作：

1	ceph config set global device_failure_prediction_mode none

CONNECTION SETTINGS

connection settings用于Ceph和DiskPrediction服务器之间的连接。

LOCAL MODE

diskprediction module利用Ceph设备运行状况检查来收集磁盘运行状况指标，并使用内部predictor module来生成磁盘故障预测并返回Ceph。因此，在local mode下不需要连接设置。 local predictor module至少需要六个设备健康状况数据集才能实施预测。

运行以下命令以使用本地预测变量预测设备的预期寿命。

ceph device predict-life-expectancy <device id>

[root@community-ceph-1 ~]# ceph device predict-life-expectancy 0d2a946c-413f-43f4-b
unknown

CLOUD MODE

在cloud mode下，需要用户注册。用户必须在https://www.diskprophet.com/#/上注册其帐户，以接收以下DiskPrediction服务器信息以进行连接设置。

Certificate file path: 确认用户注册后，系统将发送一封确认电子邮件，其中包括证书文件下载链接。下载证书文件并将其保存到Ceph系统。运行以下命令来验证文件。如果没有证书文件验证，则无法完成连接设置。

DiskPrediction server: DiskPrediction服务器名称。如果需要，它可以是IP地址。

Connection account: 用于在Ceph和DiskPrediction服务器之间建立连接的帐户名

Connection password: 用于在Ceph和DiskPrediction服务器之间建立连接的密码

运行以下命令以完成连接设置。

1	ceph device set-cloud-prediction-config <diskprediction_server> <connection_account> <connection_password> <certificate file path>

您可以使用以下命令显示连接设置：

1	ceph device show-prediction-config

其他可选配置设置如下：

diskprediction_upload_metrics_interval: 指示定期将Ceph性能指标发送到DiskPrediction服务器的频率。默认值为10分钟。

diskprediction_upload_smart_interval: 指示定期将Ceph物理设备信息发送到DiskPrediction服务器的频率。默认值为12小时。

diskprediction_retrieve_prediction_interval: 指示Ceph有时会定期从DiskPrediction服务器检索物理设备预测数据。默认值为12小时。

DISKPREDICTION DATA

diskprediction module主动向/从DiskPrediction服务器发送/检索以下数据。

METRICS DATA

Ceph cluster status

key	Description
cluster_health	Ceph health check status
num_mon	Number of monitor node
num_mon_quorum	Number of monitors in quorum
num_osd	Total number of OSD
num_osd_up	Number of OSDs that are up
num_osd_in	Number of OSDs that are in cluster
osd_epoch	Current epoch of OSD map
osd_bytes	Total capacity of cluster in bytes
osd_bytes_used	Number of used bytes on cluster
osd_bytes_avail	Number of available bytes on cluster
num_pool	Number of pools
num_pg	Total number of placement groups
num_pg_active_clean	Number of placement groups in active+clean state
num_pg_active	Number of placement groups in active state
num_pg_peering	Number of placement groups in peering state
num_object	Total number of objects on cluster
num_object_degraded	Number of degraded (missing replicas) objects
num_object_misplaced	Number of misplaced (wrong location in the cluster) objects
num_object_unfound	Number of unfound objects
num_bytes	Total number of bytes of all objects
num_mds_up	Number of MDSs that are up
num_mds_in	Number of MDS that are in cluster
num_mds_failed	Number of failed MDS
mds_epoch	Current epoch of MDS map

Ceph mon/osd performance counts

Mon:

key	Description
num_sessions	Current number of opened monitor sessions
session_add	Number of created monitor sessions
session_rm	Number of remove_session calls in monitor
session_trim	Number of trimed monitor sessions
num_elections	Number of elections monitor took part in
election_call	Number of elections started by monitor
election_win	Number of elections won by monitor
election_lose	Number of elections lost by monitor

Osd:

key	Description
op_wip	Replication operations currently being processed (primary)
op_in_bytes	Client operations total write size
op_r	Client read operations
op_out_bytes	Client operations total read size
op_w	Client write operations
op_latency	Latency of client operations (including queue time)
op_process_latency	Latency of client operations (excluding queue time)
op_r_latency	Latency of read operation (including queue time)
op_r_process_latency	Latency of read operation (excluding queue time)
op_w_in_bytes	Client data written
op_w_latency	Latency of write operation (including queue time)
op_w_process_latency	Latency of write operation (excluding queue time)
op_rw	Client read-modify-write operations
op_rw_in_bytes	Client read-modify-write operations write in
op_rw_out_bytes	Client read-modify-write operations read out
op_rw_latency	Latency of read-modify-write operation (including queue time)
op_rw_process_latency	Latency of read-modify-write operation (excluding queue time)

Ceph pool statistics

key	Description
bytes_used	Per pool bytes used
max_avail	Max available number of bytes in the pool
objects	Number of objects in the pool
wr_bytes	Number of bytes written in the pool
dirty	Number of bytes dirty in the pool
rd_bytes	Number of bytes read in the pool
stored_raw	Bytes used in pool including copies made

Ceph physical device metadata

key	Description
disk_domain_id	Physical device identify id
disk_name	Device attachment name
disk_wwn	Device wwn
model	Device model name
serial_number	Device serial number
size	Device size
vendor	Device vendor name

Ceph each objects correlation information
The module agent information
The module agent cluster information
The module agent host information

SMART DATA

Ceph physical device SMART data (provided by Ceph devicehealth module)

PREDICTION DATA

Ceph physical device prediction data

RECEIVING PREDICTED HEALTH STATUS FROM A CEPH OSD DISK DRIVE（从CEPH OSD磁盘驱动器中接收预期的健康状况）

您可以使用以下命令从Ceph OSD磁盘驱动器接收预测的健康状态。

1	ceph device get-predicted-status <device id>

get-predicted-status命令返回：

{
    "near_failure": "Good",
    "disk_wwn": "5000011111111111",
    "serial_number": "111111111",
    "predicted": "2018-05-30 18:33:12",
    "attachment": "sdb"
}

Attribute	Description
near_failure	The disk failure prediction state: Good/Warning/Bad/Unknown
disk_wwn	Disk WWN number
serial_number	Disk serial number
predicted	Predicted date
attachment	device name on the local system

磁盘故障预测状态的near_failure属性在下表中指示磁盘预期寿命。

near_failure	Life expectancy (weeks)
Good	> 6 weeks
Warning	2 weeks ~ 6 weeks
Bad	< 2 weeks

DEBUGGING

如果要调试DiskPrediction module映射到Ceph日志记录级别，请使用以下命令。

1
2
3

[mgr]

    debug mgr = 20

将日志记录设置为管理器调试时，模块将打印出带有前缀mgr [diskprediction]的日志记录消息，以便于过滤。

Hexo

Ceph DISKPREDICTION MODULE