Index cache Critical alert along with [Default Scratch]

Last post 12-11-2018, 11:56 AM by SG1. 2 replies.
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  • Index cache Critical alert along with [Default Scratch]
    Posted: 12-11-2018, 10:29 AM

    Hello all,

    Im new to using Commvault and need to pick a few brains if I may.....


    I keep receiving a few alerts:


      It is considered critically low. Backups will start failing if the cache runs out of space. Take one of the following actions:  1. Increase the index cache total disk space.  2. Reduce the retention setting on the index cache.

    ^---What approach is the wisest in resolving this, Pro\Con of either increasing the "index cache total disk space" or "reducing the retention setting on the index cache"


    Please advise on the effects of the jobs, reporting, performance, security if any etc...


    Number of media in the scratch pool [Default Scratch] inside the library [mydevicename-model of unit] is less than the minimum required number, [20]

    ^--Am I able to change +/- this numeric value to rid this error?

  • Re: Index cache Critical alert along with [Default Scratch]
    Posted: 12-11-2018, 11:02 AM

    Hello. Anser to  Part 2 of your question on Default Scratch. Yes you can change this value.

    Specify the Minimum Number of Media in a Scratch Pool

    You can establish a low watermark for each scratch pool. This parameter represents the minimum number of media that should be available inside the library for the scratch pool at all times. If the number of available media in the scratch pool falls below the low watermark, the system logs a message in the Event Viewer and generates the MediaAgents (Insufficient Storage) alert, if configured. You can view the status of media available in the scratch pools by generating the Scratch Pool Report.

    The low watermark for all user created scratch pools in the CommCell can be established in the Default low-water mark for newly created Scratch Pools option established in the Service Configuration tab of the Media Management Configuration dialog box in the Control Panel. If necessary, you can modify the low watermark for the individual scratch pools.

    When you establish a low watermark, consider the media requirements of all operations (e.g., data protection operations, auxiliary copies, synthetic full backups) that draw from the scratch pool. The low watermark should be high enough to ensure that you will be notified of the need for more media while there are still enough media available to allow running operations to complete. For example, if the operations that access a particular scratch pool regularly fill two media every week, you might set the low watermark at three. This way, you will be alerted every week to add more media to the scratch pool while it still contains sufficient media to handle its normal operational load.


    1. From the CommCell Browser, right-click the scratch pool for which you wish to specify the minimum number, and then click Properties.
    2. From the General tab use the option provided in Watermark for Spare Media in the pool area to establish a minimum number of media in the scratch pool.
    3. When you are satisfied with your changes, click OK.
  • Re: Index cache Critical alert along with [Default Scratch]
    Posted: 12-11-2018, 11:56 AM

    For Question 1. Index Cache, I would recommend you review these links.

    Index Directory Space

    These fields display the current state of index directory space usage. For more information about index space requirements, see Planning (Indexing Version 1) or Planning (Indexing Version 2).

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