We are looking to buy a new server and I am wondering what kind of hardware we should buy and how to configure it.
We are either getting 8x 2.5" 15k rpm sas disks or 6x 3.5" 15k rpm sas disks. If we go with the 2.5" disks I think we should run 6 disks in raid 10 for the database and 2 disks in raid 1 for os/wal If we go with the 3.5" disks I think we should run 4 disks in raid 10 for the database and 2 disks in raid 1 for os/wal
The database has currently about 40gb data and 20gb indexes. The work consists mainly of small transactions, with the occasional report. Currently we have 10gb ram, which is enough to hold the working set in memory 99% of the time. The database server will only be running postgres, nothing else.
So, my question is: should I go for the 2.5" disk setup or 3.5" disk setup, and does the raid setup in either case look correct?