STORAGE VENDOR Adaptec has released what it claims is the first hardware 6Gb/s SATA/SAS controller allowing users to mix hard drives and SSDs in an array.
Adaptec, known for its SCSI cards from years gone by, released its Series 6E controllers that is aimed at workstations and low-cost servers. The four-port 6405E and eight-port 6805E offer what Juergen Frick, senior product marketing manager at Adaptec claims is “the industry’s first hardware SATA3 controller”.The debate over hardware and software RAID controllers has been ongoing for many years, but while pseudo hardware RAID controllers found on high-end consumer motherboards do a perfectly good job, as Frick admits, heavy disk utilisation being able to offload hardware I/O to a controller saves significant CPU cycles, according to Frick. Another feature where Frick claims Adaptec’s latest entry-level boards increase performance is the 128MB cache that is on the controller, with Frick claiming, “caching still outperforms SSDs”.
As Adaptec’s four-port 6405E and eight-port 6805E are intended for workstations there are RAID 0, 1 and 10 modes, with both boards having the aforementioned 128MB DDR2-800 cache. The four-port card has only a PCI-Express 1x interface with bandwidth capped at 400MB/s. Asked why this was the case when SATA3 SSDs are already pushing upwards of 500MB/s, Frick said that ultimate performance was dependant on workload and that Adaptec’s customers asked for a PCI-Express 1x card to provide connectivity and the chance to access high I/Os per second data rates. Frick admitted that the eight-port 6805E, which has a PCI-Express 4x interface and a throughput of 1600MB/s, is the card you want if you want high streaming performance.
Perhaps the most interesting feature of Adaptec’s 6-series boards is the ability to mix hard drives and SSDs, with Frick saying, “Customers still have doubts over fully relying on SSDs”. Frick was referring to the ongoing concerns about SSD controller firmware. Adaptec’s Hybrid RAID software allows users to set an SSD as the boot drive, mirror the SSD on a hard drive and use the rest of the hard drive as a different partition.
As to this mix and match RAID capability, Adaptec has said that it now tests “desktop-grade” hard drives to see how they operate in 24×7 environments. Frick explained that these drives are the standard drives that are not offered with a ‘RAID edition’ sticker. Frick went on to say that Adaptec has tested over 350 drives to ensure compatibility with the controller.
Although motherboard chipset vendors have done a lot to improve the performance of their pseudo-RAID devices, there’s little doubt that for commercial environments controller boards from firms like Adaptec, Areca and LSI are still extremely popular, and for good reason. Not only do they offer higher performance and better customer support, but driver support is considerably better, with Adaptec having open source drivers for both FreeBSD and Linux.
Adaptec said that customers will be able to order the 6405E and 6805E from today with prices ranging from £120 to £175.