Hey everyone. I am confused. When looking at RAIS adapters I notice that there is a difference between the number of ports and the number of drives supported. Such as the following off of eBay:
Adaptec 5405 RAID controller
4 internal port, low profile, PCI-Express (PCIe) Unified Serial RAID controller with Intelligent Power Management delivers exceptional performance, advanced data protection, and maximum scalability for enterprise-class, high-density server applications
RAID levels 0, 1, 1E, 5, 5EE, 6, 10, 50*, 60*, JBOD
Key RAID Features
• Supports 4 direct-attached or up to 256 SATA or SAS disk drives using SAS expanders
• RAID levels 0, 1, 1E, 5, 5EE, 6, 10, 50* and 60*
But when I look at RAID setups, it appears that there is one drive per port attached.
There are a number of 8 port adapters that say they support RAID 60 and more than 24 drives. I assume that I would use a breakout cable that plugs in 4-6 SATA drives into a single port on the adapter. If that is the case, why would you want to load up a server with 3-4 RAID adapters and plug one drive per port. I don't think fault tolerence is the issue as a bad card takes off line all the drives attached. Granted that may be only one RAID set but that isn't my question.
My goal is to build (2) 12 disk RAID 60 sets. If I want to load up a 24 disk storage server, do I need a 24 port adapter, one per dive, or an adapter that can support 24 drives, 4 drives per port? Maybe two 4 port adapters with breakout cables?
Adaptec 5405 RAID controller
4 internal port, low profile, PCI-Express (PCIe) Unified Serial RAID controller with Intelligent Power Management delivers exceptional performance, advanced data protection, and maximum scalability for enterprise-class, high-density server applications
RAID levels 0, 1, 1E, 5, 5EE, 6, 10, 50*, 60*, JBOD
Key RAID Features
• Supports 4 direct-attached or up to 256 SATA or SAS disk drives using SAS expanders
• RAID levels 0, 1, 1E, 5, 5EE, 6, 10, 50* and 60*
But when I look at RAID setups, it appears that there is one drive per port attached.
There are a number of 8 port adapters that say they support RAID 60 and more than 24 drives. I assume that I would use a breakout cable that plugs in 4-6 SATA drives into a single port on the adapter. If that is the case, why would you want to load up a server with 3-4 RAID adapters and plug one drive per port. I don't think fault tolerence is the issue as a bad card takes off line all the drives attached. Granted that may be only one RAID set but that isn't my question.
My goal is to build (2) 12 disk RAID 60 sets. If I want to load up a 24 disk storage server, do I need a 24 port adapter, one per dive, or an adapter that can support 24 drives, 4 drives per port? Maybe two 4 port adapters with breakout cables?