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JBOD storage expansion shelf. The JBOD has become a permanent fixture of the Storage Review lab, enabling us to directly connect SATA or SAS drives to a host compute system via LSI 9207-8e SAS expander. The iX-316J can be used in a variety of use cases, ranging from accepting up to 64TB of SATA drives, all the way up to the speedier 2.5" 10K and 15K drives, should the user choose to go that route. In this review we look at three different sets of hard drives, clearly illustrating the performance vs. capacity trade-offs that occur with modern enterprise hard drives.
The concept of a storage shelf, or JBOD, is one of the more basic in storage architecture. The chassis with battery such as Lenovo 92P1106 Ac Adapter, Lenovo 3000 C100 Ac Adapter, Lenovo FRU 92P1108 Ac Adapter, Lenovo 40Y7668 Ac Adapter, Lenovo 92P1160 Ac Adapter, Lenovo 3000 Ac Adapter, Lenovo ThinkPad R60 Ac Adapter, Lenovo ThinkPad T60 Ac Adapter, Lenovo 3000 V100 Ac Adapter, Lenovo 40Y7660 Ac Adapter, Lenovo 92P1157 Ac Adapter, Lenovo 92P1106 Ac Adapter essentially houses the drives, connecting to a host machine via SAS cable and HBA in the host. This type of arrangement continues to be popular where enterprise users want to keep the storage local to the host, but have perhaps grown out of available drive bays, or have other unique requirements and aren't in need of a full-on SAN with it's own storage controllers. In fact, looking forward, we'll be showing these same configurations of hard drives paired with caching solutions, to show how flash and software can benefit large arrays of hard drives in an enterprise environment. The use cases for JBOD continue to expand with new technology and powerful compute power on the host side.
The iXsystems Titan iX-316J is a 3U rack-mount enclosure with 16 front-accessible 3.5" drive bays. It offers an active-active HA SAS interface to connect to two hosts, as well as an expansion port to string together multiple JBOD units. It supports both 3.5" and 2.5" drives natively, through the use of universal drive caddies. While both SAS and SATA drives are supported, SATA drives must use an adapter to give them dual-ported capabilities. The front of the Titan 316J is equipped with a power switch, as well as interface lights that show when connections are active and the unit is online. This particular chassis was designed with both JBOD and storage server duties in mind, with some lights not being connected in our configuration.
The back of the iXsystems Titan iX-316J is very basic, since the unit doesn't contain any compute interface that you might find in a server. The only connections to this unit are two power supplies as well as four SAS connections. The main link to the internal expander is a 4-channel SFF-8088 connection, giving the unit a peak transfer speed of about 2,400MB/s. One port on each side is dedicated to a connection to the server that will be hosting it, while the other two are for connecting the 316J to another JBOD shelf.
Since the unit and backplane are geared towards HA environments, iXsystems supplied us with LSI SATA-to-SAS adapters that we used when testing the JBOD with SATA hard drives. The drive caddies were designed with these adapters in mind, so installation was a breeze.
For quick and easy rack installation, iXsystems includes a sliding rail kit with the Titan iX-316J JBOD. Installation took just a few minutes, as the rails snapped into position in our rack without the use of tools. Once installed, you extend the recieving rails, install the mounting rails on the side of the chassis, and slide the unit into place.