AMCC, Areca & LSI Serial RAID Controllers

AMCC 3Ware 9690SA-8I

The card has two multi-lane ports, each of which is capable of running four SAS or SATA drives directly, or up to 64 disk drives using multiple SAS expanders. The interface bandwidth of 2 GB/s upstream and downstream is high enough to support RAID arrays with lots of hard drives. Our test sample was the 9690SA-8I, which has eight ports for internal use. Model -8E has two external connectors with four ports each, and -4I4E offers an internal and one external multi-lane connector.

All 9690SA cards support RAID 0 and 1; RAID 10, RAID 5 and 6 and the nested RAID mode 60. There is an optional BBU (battery backup unit), which we strongly recommend, because it will retain the cache content in case of a power outage. A UPS unit (uninterruptible power supply) would, of course, be a more prudent purchase, though.

This controller provided high I/O performance across all benchmark patterns, and it was easily capable of moving more than 400 MB/s during out tests. The measurements with the Atto disk benchmark and h2benchw weren’t very reproducible - most likely because of the cache memory - which is why we did not include these results. While many controllers provide similar performance in RAID 0, 3Ware’s card is slightly faster than the others in most RAID 5 tests and especially in RAID 6.

The feature set is very comprehensive and includes handling of multiple arrays, write journaling, how-swap and hot spares, emergency flash recovery to prevent failed firmware updates, email notification, drive activity LED support, enclosure management via I2C or SES 2.0 and RAID features such as Online Capacity Expansion and RAID Level Migration.

Patrick Schmid
Editor-in-Chief (2005-2006)

Patrick Schmid was the editor-in-chief for Tom's Hardware from 2005 to 2006. He wrote numerous articles on a wide range of hardware topics, including storage, CPUs, and system builds.