Miscellaneous Aspects and Concluding Remarks

The single 120mm fan had no trouble keeping the temperatures of the SSDs inside the enclosure within acceptable limits during the course of benchmarking. Obviously, hard drives require more airflow. Thankfully, the ventilated front panel and the drive tray ensure this. That said, having two fans (one behind each set of four drives) could have resulted in a better thermal solution. The 2x 80mm fan approach adopted by Mediasonic may result in better airflow, but it does result in higher sound levels. There is a trade-off, and StarTech.com has gone for the quieter single fan solution.

The table below presents the power consumption of the unit recorded under different scenarios. Note that the eight disks mentioned in the table below are all 240GB Intel SSD DC S3150 drives.

StarTech.com S358BU33ERM 8-bay Removable Hard Drive Enclosure
Power Consumption
StarTech.com S358BU33ERM (diskless, powered on, connected via USB 3.0) 28.43 W
USB 3.0 128K Sequential @ QD4 - 8 Disks 38.23 W - 39.67 W
USB 3.0 4K Random @ QD32 - 8 Disks 39.23 W - 39.56 W
eSATA 128K Sequential @ QD4 - 8 Disks 38.02 W - 40.05 W
eSATA 4K Random @ QD32 - 8 Disks 37.05 W - 37.71 W

The StarTech.com 8-bay hard drive enclosure with hot-swap support lends itself to multiple use-cases:

  • A simple JBOD enclosure for users with large amounts of data that need to be accessed from a single machine
  • A safe storage place for old hard drives
  • Enable easy decommissioning and/or data recovery from most common COTS NAS units

Touching upon the last point further, I would like to point readers to our article that dealt with data recovery from a failed NAS. In that piece, I had spent considerable time attempting to free up the SATA ports on the motherboard. Since then, I have attempted data recovery from the disks of multiple NAS units. I soon found that things were greatly simplified by slotting in the disks in an enclosure like the Mediasonic Probox or the StarTech.com 8-bay DAS that we are talking about today. It enables data recovery even on machines like the Intel NUCs which don't have any spare SATA ports. This could be achieved by connecting the DAS via eSATA or USB 3.0 and reassembling the RAID volume from within the OS. In essence, a high bay-count DAS unit is an indispensable tool in the arsenal of any power user.

The product does have scope for improvement. Though visual inspection made the unit appear strong and robust, we found after a few days of use that the front panel had loosened up considerably and could almost be taken out of the chassis (only held back by the wires behind the bottom of the front panel). It would be nice to have better build quality and materials. The hard drive trays are very good for keeping the member disks ventilated. However, the drive tray opening mechanism is not exactly intuitive. The final improvement aspect that needs to be addressed is the power consumption. In particular, consuming upwards of 27W at idle with no disks attached appears way too high. The product page also doesn't make it clear that a SATA chipset with port multiplier support is needed for accessing multiple disks in the array over an eSATA connection.

Coming to the pricing segment, we find that the comparable Mediasonic Probox comes in at $270. The Probox was recently updated to support SATA III drives at 6 Gbps. The StarTech.com S358BU33ERM is priced at $392 on their website. However, Newegg and Amazon are selling the same unit for $311  and $309 respectively. For the premium over the Mediasonic Probox, the consumer gets a better designed chassis with easily accessible ports that also happens to operate quietly.

USB 3.0 Performance
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  • jardows2 - Tuesday, August 11, 2015 - link

    Interesting product. As I was reading though, I kept thinking "How would I be able to use something like this?" I couldn't find in my mind any real scenario where this would be better than a NAS, until the last page where it was mentioned you could use this to help rebuild a RAID array. I'd love to see a more in-depth article/HOWTO on this process!
  • dave_the_nerd - Thursday, August 13, 2015 - link

    In general, this would be quite a bit faster than a NAS. So if you have any kind of data that's big but only needs to be accessed by a single computer (say, you're doing video production) these sorts of DAS enclosures are a pretty common sight.

    They're also useful for expanding a homebuilt NAS or file server.
  • Visual - Friday, August 21, 2015 - link

    Um. Plug this in the USB port of most any home router made in the past decade, and you have a NAS.
  • dhotay - Tuesday, August 11, 2015 - link

    I don't see the value of testing this case with all SSDs instead of spinners. The thermal and power usage benchmarks are best-case scenarios, thanks to that decision.
  • basroil - Tuesday, August 11, 2015 - link

    Recently ran out of SATA ports on my tower and was seriously considering adding one of these devices to my collection. ~200MB/s write and ~100MB/s read is perfect for my photo/raw footage collection mid tier storage. Mind doing a few more of these on 5-10 drive switched enclosures? The cost savings compared to something like a drobo when all you want is direct attached storage is huge.
  • Navvie - Tuesday, August 11, 2015 - link

    I have a similar 4 bay JBOD e-SATA enclosure connected to my Gen8 microserver NAS. Adds more drive capacity without having to buy a new machine.

    I'd struggle to come up with any other use for them. Certainly my next NAS build will have more internal bays.
  • joex4444 - Tuesday, August 11, 2015 - link

    DAS devices have a couple other uses. They are similar to external drives, though they might logically be a RAID device, so they let you choose which volumes are on based on your current needs. This is good because it saves power and reduces noise. Further, if you can use DAS devices to have a single SSD in your build and all your hard drives in the DAS then you reduce the amount of heat in your PC. I'd much rather have 8 drives in a separate box with a separate PSU and fan than try to get my tower to also stay cool with 8 HDDs stuffed in it, which also impede airflow as they dump extra heat into the system.
  • karpodiem - Tuesday, August 11, 2015 - link

    Is it possible to do software RAID6 in Linux if all eight drives were empty?
  • digitalgriffin - Tuesday, August 11, 2015 - link

    With ZFS you could. However this eSATA enclosure chip only has hardware JBOD
  • fackamato - Tuesday, August 11, 2015 - link

    So software RAID6 in Linux would work great then?

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