Have you read Redhat Satellite 6.3 installation guide?
I usually like to read installation guides because they are full of useful tips! In this case I learned new interesting things about I/O performance for Satellite:
1) foreman-maintain utility. It checks the disk speed for Satellite /var sub-filesystems, for example:
# foreman-maintain upgrade check --target-version 6.2.z
Check for recommended disk speed of pulp, mongodb, pgsql dir.:
Disk speed : 80 MB/sec [OK]
( Take care about planning /var filesystem for your Satellite/Capsule installation. It will be one of the most stressed filesystems due the requested I/O )
2) The fantastic fio command! The previous ‘foreman-maintain’ utility uses fio command for the benchmarks. At the beginning it’s not easy to understand but it’s very powerful.
I suggest you to read more about fio and Satellite benchmarks checking this Redhat solution.
Let me know about your thoughts! 🙂