Hi,

In your setupDatabase.properties file which is present in the script folder, you can provide the value of

"user.temp.dir= " to give a custom temp directory which has enough space to run.

Regards,

Vikash

Thanks Karan for your prompt reply.

however my query was regarding Java I/O temp directory ie:  "java.io.tmpdir"  , not "user.temp.dir".

Could you kindly advise if this Java I/O temp directory can also be customized and how ? Because unlike "user.temp.dir", "java.io.tmpdir" parameter is not available in setupDatabase.properties file.

for all upgrades I did, all files where stored in user.temp.dir defined setupDatabase.properties
I also launched the upgrades from this user.temp.dir/scripts where the install.sh is.

my logs are never refering java.io.tmpdir and [pega:hasenoughspace] is well checking user.temp.dir
I think that your parameter user.temp.dir in setupDatabase.properties is not properly loaded leading 
install.temp.dir.root to point to java.io.tmpdir
in setupDatabase.xml there's
 <condition property="install.temp.dir.root"     value="${user.temp.dir.root}" else="${java.io.tmpdir}">

You should maybe recheck that install.sh is pointing to correct setupDatabase.properties
I found same info in my logs for 7.3.1 and 8.2.1 migrations

I also had to add some specific jvm arg in properties files so above suggestion will certainly work.
I added right after the pega.jdbc lines a line with jvm.args=........