Showing results for 
Search instead for 
Did you mean: 
Sign up Log in

Next challenges

Recent achievements

  • Global
  • Personal


  • Give kudos
  • Received
  • Given


  • Global

Trophy case

Kudos (beta program)

Kudos logo

You've been invited into the Kudos (beta program) private group. Chat with others in the program, or give feedback to Atlassian.

View group

It's not the same without you

Join the community to find out what other Atlassian users are discussing, debating and creating.

Atlassian Community Hero Image Collage

how to calculate needed available disk space for Confluence Cloud Migration Assistant

Is there a way to calculate the required server available space for the Confluence Cloud Migration Assistant from Server to Cloud to run?

Will there be a warning if the available space is not enough?







1 answer

1 accepted

0 votes
Answer accepted
Daniel Eads Atlassian Team Sep 01, 2020

Hello @Mordechai Cikk ,

Currently the migration assistant doesn't do a check for free space before running. Its requirements are not large; it generates XML from the database similar to how a regular XML backup would function, then uploads the XML and your attachments to Confluence Cloud. The attachments are not duplicated on-disk before upload, so the space required to run the assistant is about what you'd need for a regular XML backup. Once the migration assistant has completed, the export it made locally is removed from disk.

Confluence does have a disk space healthcheck that runs on a regular schedule, so if you're not getting warnings from the healthcheck already, you are probably in good shape to run the migration assistant. If I had to throw out a random number for a Server instance that had maybe 30 fairly active spaces, I would guess that 5 GB of disk space would be the most I would expect the migration assistant to use. This is going to vary based on the number of spaces and how many pages / edits there are, but this is all text and doesn't consume a ton of disk space.

We do recommend that your heap for Confluence is at least 4GB to ensure the migration assistant doesn't encounter an out-of-memory error when generating the export however. If you need more information about checking and increasing the memory allocation, that's Step 12 in the pre-migration checklist.


Thanks Daniel for the clear and detailed  answer providing the information we need.



Suggest an answer

Log in or Sign up to answer
Community showcase
Published in Confluence Cloud

Get to know the Confluence team!

Go “behind the screen” to meet some of the Confluence Cloud team. In this video series, we tackle some of the hard-hitting questions you never knew you wanted the answer to!  Meet some of the ...

236 views 0 10
Read article

Community Events

Connect with like-minded Atlassian users at free events near you!

Find an event

Connect with like-minded Atlassian users at free events near you!

Unfortunately there are no Community Events near you at the moment.

Host an event

You're one step closer to meeting fellow Atlassian users at your local event. Learn more about Community Events

Events near you