I am looking for advice on buying SSD disks for my server. I have two barely used Fujitsu RX300 S7 servers with A LOT of RAM, LSI SAS2108-based RAID 6G controller with 512MB cache and 8 disk cages.
Now, my plan is to use those two servers with VMWare 5.5 or 6.0 platform to host these virtual servers:
- 3 or 4 all-in-one web servers (Windows IIS + .NET + MSSQL and Linux equivalent)
- 3 mail servers
- 1 firewall
FIRST CONSIDERATION - SSD DISKS What I am considering now is which SSD disks would be best compromise on quality, performance and durability for reasonable price:
- Samsung 850 EVO
- Samsung 850 PRO
- Samsung SM863 Enterprise
- Samsung PM863 Enterprise
The RAID conntroller is a bit old and like many others does not support SSD Trim. Also I do not want to buy SSD disks, which RAID controller could not utilize to their potential.
SECOND CONSIDERATION - ONE SINGLE OR MULTIPLE RAID ARRAYS I know this has been debated many times, but many studies are based on IOPS prediction. I have no idea of my IOPS at the time, nor how to estimate them for the future. What I am thinking about is to configure:
- one larger RAID 10 array with 6 disks for SYSTEMS, DATA and WEB stores
- and one RAID 1 array with 2 disks for random IOPS, which I would dedicate as a partition to put MySQL and MSSQL logs onto (not the whole server, just SQL partition)
What do you think?