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Performance Monitoring Guide

OceanStor Dorado V3 Series V300R002

This document describes performance monitoring of storage systems, including the monitoring method, indicator planning, configuration monitoring, and problem diagnosis.
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Analyzing Cache Performance

Analyzing Cache Performance

A cache is the key module that improves performance and user experience. Cache configurations on the performance of write functions are important areas of focus.

If the cache write policy is write-back, a write success message is returned to the host as soon as each write I/O arrives at the cache. Then, the cache sorts and combines data before writing to disks.

If problems such as backup battery unit (BBU) fault, single-controller state, controller overheating, and excessive number of LUN fault pages occur during service running, the LUN health status may switch to write protection. In this situation, data cannot be written to disks but can be read. Write protection prevents data in disks from being modified.

You can query the properties of a LUN on DeviceManager or the CLI and obtain the current LUN health status and cache write policy.

  • To query the LUN properties on DeviceManager:


The cache write policy can be queried on the Advanced page.

  • To query the LUN properties on the CLI, run show lun general.
    admin:/>show lun general lun_id=0 
      ID                              : 0 
      Name                            : LUN001 
      Pool ID                         : 0 
      Capacity                        : 10.000GB 
      Subscribed Capacity             : 0.000B 
      Protection Capacity             : 0.000B 
      Sector Size                     : 512.000B 
      Health Status                   : Normal 
      Running Status                  : Online 
      Type                            : Thin 
      IO Priority                     : Low 
      WWN                             : 6e0979610048d172004d3dXXXXXXXXXX 
      Exposed To Initiator            : No 
      Data Distributing               : -- 
      Write Policy                    : Write Back 
      Running Write Policy            : Write Back 
      Prefetch Policy                 : None 
      Read Cache Policy               : -- 
      Write Cache Policy              : -- 
      Cache Partition ID              : -- 
      Prefetch Value                  : -- 
      Owner Controller                : 0A 
      Work Controller                 : 0A 
      Snapshot ID(s)                  : -- 
      LUN Copy ID(s)                  : -- 
      Remote Replication ID(s)        : -- 
      Split Clone ID(s)               : -- 
      Relocation Policy               : -- 
      Initial Distribute Policy       : -- 
      SmartQoS Policy ID              : -- 
      Protection Duration(days)       : -- 
      Has Protected For(h)            : -- 
      Estimated Data To Move To Tier0 : -- 
      Estimated Data To Move To Tier1 : -- 
      Estimated Data To Move To Tier2 : -- 
      Is Add To Lun Group             : No 
      Smart Cache Partition ID        : -- 
      DIF Switch                      : No 
      Remote LUN WWN                  : -- 
      Disk Location                   : Internal 
      LUN Migration                   : -- 
      Progress(%)                     : -- 
      Smart Cache Cached Size         : -- 
      Smart Cache Hit Rage(%)         : -- 
      Mirror Type                     : -- 
      Thresholds Percent(%)           : 90 
      Thresholds Switch               : Off 
      Usage Type                      : Internal 
      HyperMetro ID(s)                : 
      Dedup Enabled                   : Yes 
      Compression Enabled             : Yes
  • Health Status refers to the LUN health status.
  • Write Policy refers to the configured cache write policy.
  • Running Write Policy refers to the cache write policy currently in use.

If the LUN health status is write protection, check for the cause, for example, whether a BBU is faulty, the system is running in single-controller mode, a controller is overheated, or the number of LUN fault pages exceeds the threshold. For detailed handling methods, see Planning the LUN Policies in OceanStor Dorado V3 Series V300R002 Basic Storage Service Configuration Guide.

Updated: 2019-07-17

Document ID: EDOC1100049152

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