HP P400

As secondary Controller for the HA Storage Cluster systems I’ve ordered two HP Smart Array P400 SAS RAID Controllers. Primary controller in each system will be a HP P800. The reason for the P400 was simple. This controller is used by many people outside of HP systems and has been tested very well. Another nice point is that the P400 is quite cheap and performance good. Many online management features are supported like: Online Capacity Expansion, Online RAID LEVEL Migration, Online Stripe Size Migration, Online Spares (Global) and User Selectable Expand and Rebuild Priority. Other features like NCQ.

Specification overview of the HP P400:

Dimensions (not including bracket)	Low Profile PCIe Form Factor 6.61 in x 2.75 in x 0.7 in (16.8 cm x 7.0 cm x 1.8 cm)
Disk Drive and Enclosure Interface	3Gb/s SAS (Serial Attached SCSI)
	3Gb/s SATA (Serial ATA)
SAS Connectors	2 internal (SFF8484) x4 wide port connectors
Cache Memory Speed	DDR2-533MHz with 40 or 72-bit wide bus provides up to 4.2 GB/s maximum bandwidth.
Server Interface	x8 2.5G PCIe provides 2GB/s maximum bandwidth
SAS Speed	x8 3G SAS provides 2.4GB/s maximum bandwidth
Cache Memory	40-bit 256MB ECC protected cache (72-bit 512MB module upgrades available); transportable with battery-backed upgrade
Logical Drives Supported	Up to 32 logical drives
Maximum Logical Drive Capacity	Greater than 2TB
Host Memory Addressing	64-bit, supporting greater than 4GB server memory space
RAID Support	RAID 6 with ADG (Advanced Data Guarding) requires Battery Backed Write Cache Upgrade
	RAID 5 (Distributed Data Guarding)
	RAID 1+0 (Striping & Mirroring)
	RAID 0 (Striping)
Upgradeable Firmware	Upgradeable Firmware with recovery ROM feature

 

The BBWC and 512MB Cache Modul form the HP P400:

The Cache Modul uses DDR2 memory with ECC.

The Smart Array BBWC Battery is a 0.3kg heavy lithium battery. It has a capacity of 500 miliamp hours.