Description of problem - Provide a detailed description of the issue encountered, including logs/command-output snippets and screenshots if the issue is observed in the UI:

When upgrading from version 12 to 15, two scripts are executed.
The first is dumpdb.sh which requires no more than 33% of used disk space and this is ok.
Then this script dumps the db to the disk.
Then the real upgrade script is run, this requires the same max 33% of used disk space, but this is really not possible, because the dump is using some more disk space. This script should require less disk space, maybe 50%.
If we reserve 66% of free disk space at the beginning of the process, after the dump the free disk will be much less, and we always fail upgrading the db.

The OCP platform infrastructure and deployment type (AWS, Bare Metal, VMware, etc. Please clarify if it is platform agnostic deployment), (IPI/UPI):

vmware IPI

The ODF deployment type (Internal, External, Internal-Attached (LSO), Multicluster, DR, Provider, etc):

Internal-Attached (LSO

The version of all relevant components (OCP, ODF, RHCS, ACM whichever is applicable):

ocp  4.14.z 

Does this issue impact your ability to continue to work with the product?

Is there any workaround available to the best of your knowledge?

Can this issue be reproduced? If so, please provide the hit rate

Can this issue be reproduced from the UI?

If this is a regression, please provide more details to justify this:

Steps to Reproduce:

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The exact date and time when the issue was observed, including timezone details:

Actual results:

Expected results:

Logs collected and log location:

Additional info: