I have two options on Dell H730 (LSI Megaraid) controller for my AE servers running on VMs:
- Create VD (virtual drive) for each SSD attached (set read/write/drive cache policy, ncq etc via RAID BIOS or MegaCLI) and attach them directly to VM
- Set each SSD as Non-RAID drive (control via hdparm/smartctl) (it also gives me +1GB more disk space than in VD-mode) and attach directly too
According to Raid vs directly attached ssds the use of VD-mode leads to performance degradation.
Any ideas what is the best?
P.S. There are VD-drive options (like no read cache, no write cache etc.) recommended for use with FastPath technology but it’s required to buy the license key.