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Druva Documentation

Troubleshooting the alert CloudCache unable to read write on Volume

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Problem description

The CloudCache cannot read or write data to the volume during backups, restores, or while running the synchronization schedule. Phoenix logs show the activity during which the alert occurs. The alert says CloudCache unable to read/write on Volume – <Drive:>\Phoenix\PhoenixCacheStore.


You can run into this issue due to one of the following reasons:

  • Drive detached
  • Server offline
  • Low virtual memory on the server


Log location:  C:\ProgramData\PhoenixCloudCache\Phoenixcloudcache.log 

[2020-01-31 06:25:08,348] [INFO] [wpid 943-3568-1580468901] CacheFlush activity disconnected. wid 1

[2020-01-31 06:25:08,348] [ERROR] Error <type 'exceptions.MemoryError'>:. Traceback -Traceback (most recent call last):

File "inSyncLib\inSyncRPCServer.pyc", line 97, in call_method

File "inSyncLib\inSyncRPCBase.pyc", line 1115, in call_method

File "roboCacheServerRPC.pyc", line 277, in cachemaster_update_data_config

File "roboLib\roboConfigParser.pyc", line 209, in save

File "roboLib\roboConfigParser.pyc", line 227, in saveLocked

File "roboLib\roboConfigParser.pyc", line 306, in _encode

File "roboLib\roboUtils.pyc", line 62, in encrypt



Event log

event id 2004. 

The Resource Exhaustion event.

Windows successfully diagnosed a low virtual memory condition. The following programs consumed the most virtual memory: <Application1>.exe (10204) consumed 480612352 bytes, <Application2>.exe (2372) consumed 164450304 bytes, and PhoenixCacheServer.exe (5796) consumed 96604160 bytes. 


  • Check the applications mentioned in the Windows event.  Example: <Application1>.exe and <Application2>.exe are consuming most of the memory. 
    Manage the applications which are consuming more memory.
  • Increase Virtual memory.
  • Increase Physical memory.
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