Two SAP installation in one machine

Dear Experts
SAP ECC6 EHP4 READY
DB2
HP-UX
i have a requirment to install DEV and QAS server in single server. i already installed the DEV server. now i need to install the QAS server my query is what the prerequisite i need to fallow before starting the QAS server installation. and i there any file which need to be modifi. ITS my first time to work on this kind of landscape. kindly guide me.
i have the below file system.
/sapmnt/DEV
/db2/DEV/sapdata1
/db2/DEV/sapdata2
/db2/DEV/sapdata3
/db2/DEV/sapdata4
/db2/DEV/saptemp1
/db2/DEV/db2dump
/db2/DEV/log_dir
/db2/db2dev
/db2/DEV/db2dev
/db2/log_archive/
/db2/log_retrieve
/db2dev
/usr/sap/DEV/DVEBMGS00
/usr/sap/trans
/sapmnt/QAS
/db2/QAS/sapdata1
/db2/QAS/sapdata2
/db2/QAS/sapdata3
/db2/QAS/sapdata4
/db2/QAS/saptemp1
/db2/QAS/db2dump
/db2/QAS/log_dir
/db2/db2qas
/db2/QAS/db2qas
/db2qas
/usr/sap/QAS/DVEBMGS01
/sapdump
thanks/regards
sadiq

Dear Sadiq,
From DB point of view there is no problem to install two separate databases
of DB2 on one machine. The DB2 source files are installed into different directories and will not
impact each other.
After installing the software, the DB2 instance called "db2<SID>' is
created with the DB2 version you choose. The installation procedure
depends on the SAP release.
Whether of not your machine is able to handle both systems running on one server depends on
the hardware and settings.
Regards,
Paul

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