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Grace Yin's avatar
Grace Yin
Iron Contributor
Feb 08, 2019

Run out of local disk space on on-premises Exchange server

Hi,   We have Office 365 hybrid configuration with Exchange 2016. I noticed the folder C:\Program Files\Microsoft\Exchange Server\V15\Mailbox\Mailbox Database 1872985310 is growing very big on the ...
office 365
Grace Yin's avatar
Grace Yin
Iron Contributor
Feb 14, 2019

Hi Nuno,

 

Thank you for your reply. I have made full backup of the server by Windows Backup, but the disk space is still low. The used disk size did not reduce.

 

Please advise!

 

Many thanks!

NunoAriasSilva's avatar
NunoAriasSilva
MVP
Feb 14, 2019

Hi Grace Yin , 

 

The Backup only clear your transaction logs files, you will need to know what files or folders are consuming more space to figure out the root cause.

 

For example, if your database is very big you need to see what mailboxes are inside and their size.

  • Grace Yin's avatar
    Grace Yin
    Iron Contributor
    Feb 15, 2019

    Just want to correct the wrong information. We do not have hybrid environment. We have directory sync. 

    • Lynn Towle's avatar
      Lynn Towle
      Iron Contributor
      Feb 15, 2019

      Oh, and the easiest way to see what is connected to that database is to log into the ecp, add a column to show you what is attached to which database in the recipients menu, and then sort. If any mailboxes are attached to it, you will see there.

      • Grace Yin's avatar
        Grace Yin
        Iron Contributor
        Feb 15, 2019

        Hi Lynn,

         

        Thank you for your reply. We didn't enable circular log.

         

        I figured out how to reduce the log size. I will need to select Custom Backup in Windows backup and select VSS full backup.

         

         

         

    • Lynn Towle's avatar
      Lynn Towle
      Iron Contributor
      Feb 15, 2019

      The logging folder doesn't surprise me, that folder can get fairly large.

       

      Do you have circular logging enabled on your database? Those logs are not being purged it seems.

       

      I don't have a link, but there is a way to manually purge the log files, but you have to take the database offline to do so.

       

      Here is the info for circular logging. It's for 2013, but I think it works the same or similar for 2016.

       

      https://docs.microsoft.com/en-us/exchange/configure-circular-logging-for-a-mailbox-database-exchange-2013-help

       

      Also, if you are using a backup program, you may want to check to see if it needs circular logging enabled or not.

  • Grace Yin's avatar
    Grace Yin
    Iron Contributor
    Feb 15, 2019

    Hi Nuno,

     

    I just checked the server. The biggest file is Mailbox Database 1872985310.edb (25 GB) in C:\Program Files\Microsoft\Exchange Server\V15\Mailbox\Mailbox Database 1872985310. Besides this file, there are almost 40K items of 1 MB text files. They all together is 40 GB. Please see the image below. 

     

     

    Also the logging folder is 10 GB. See the image below.

     

    Please advise how to reduce the size.

     

    Thanks in advance!

  • Grace Yin's avatar
    Grace Yin
    Iron Contributor
    Feb 14, 2019

    Hi Nuno,

     

    Folder "Mailbox Database 1872985310" in C:\Program Files\Microsoft\Exchange Server\V15\Mailbox\ is very big. What is this folder for? How to clean up to free space? Folder "log" is also big.

     

    Please advise!

     

    Thanks!