ERROR: Change journal has wrapped, reindexing EZIP volumes

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  • Product:
    ExtremeZ-IP
  • Version:
    4.0-current
  • Document Type:
    Info
  • Revised:
    1/12/2007
  • Reviewed:
    2/28/2007

Summary:

The following error message may appear in the Windows Event Log:

“Change journal for volume <volume name> has wrapped, reindexing EZIP volumes”.

Description:

When the search indexing feature is enabled, ExtremeZ-IP devotes resources to watching and processing changes from the NTFS Change Journal, Windows’ internal log of all file system transactions. On servers with a very high rate of file system changes (particularly file creation and deletion), ExtremeZ-IP may not be able to process these changes rapidly enough. If ExtremeZ-IP falls far enough behind, this will trigger an automatic reindex of any volumes on a particular physical disk.

To increase the amount of resources ExtremeZ-IP devotes to processing the Change Journal, ExtremeZ-IP exposes a non-refreshable registry value: “ChangeJournalReaderThreads”. This value must be between the default of 2 and a maximum of 5. Increasing this value (and restarting the service) can alleviate this reindexing issue.

The registry value can be created or edited by following the directions below:

Go to Start>Run>regedit
Navigate through the following folders: \HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\ExtremeZ-IP\Parameters4\NonRefreshable
Edit> Create new> DWORD Value
Enter “ChangeJournalReaderThreads” (no quotes)
Doubleclick on the new key and enter the ValueData (from 2 to 5, inclusive)
Click OK

Since this is a non-refreshable value, the change will not take effect until the next time ExtremeZ-IP starts up.

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