Promise Technology 48TB Pegasus2 R8 Thunderbolt 2 RAID Storage Array

Promise Technology 48TB Pegasus2 R8 Thunderbolt 2 RAID Storage Array

Promise Technology 48TB Pegasus2 R8 Thunderbolt 2 RAID Storage Array

Promise Technology 48TB Pegasus2 R8 Thunderbolt 2 RAID Storage Array

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Product Highlights

  • Includes 8 x 6TB SATA HDDs
  • 48TB Storage Capacity
  • 2 x Thunderbolt 2 Ports
  • 8 Hot-Swappable Drive Bays
  • Pre-Configured in RAID 5 Mode
  • Supports RAID 0, 1, 5, 6, 10, 50, 60
  • Compatible with Time Machine in OS X
  • Mac Compatible
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Capacity: 48TB


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Not available with current selections




Bays: 8


Not available with current selections


Promise Technology R8 overview

  • 1Description

The Promise Technology 48TB Pegasus2 R4 is a Thunderbolt 2 RAID storage array designed for simultaneous streaming, editing, and backup of high-resolution videos and large multimedia files. This storage array's Thunderbolt 2 interface offers high-speed connectivity. The Pegasus2 R8 stores up to 48TB of data spread across eight 4TB 7200 rpm SATA drives. Actual storage capacity will differ according to the RAID configuration. These drives are hot-swappable for easy access and come pre-configured in RAID 5 mode, which is optimized for data protection, capacity, and performance. RAID levels 0, 1, 5, 6, and 10 are also supported; each level offers configuration options for capacity, data protection, redundancy, and speed.

The Pegasus2 R8 storage array has dual Thunderbolt 2 ports, one port for direct system attachment and another port for daisy-chaining up to 6 Thunderbolt 2 devices. This storage is formatted in the HFS+ file system for Mac and is compatible with Time Machine in OS X, which automatically backs up your entire Mac system.

Thunderbolt 2
The Pegasus2's Thunderbolt 2 interface is sufficient for handling and accelerating 3D or 4K (UHD) workflows. Thunderbolt 2 uses the same cable as the previous generation but has double the available bandwidth for a maximum throughput of 20Gb/s.
4K Workflows
The bandwidth of Thunderbolt 2 and the Pegasus2 is designed to give professionals the ability to edit and view live 4K streams while backing up the same file to a single or daisy-chained Pegasus2 storage array system.
In the Box
Promise Technology 48TB Pegasus2 R8 Thunderbolt 2 RAID Storage Array
  • Thunderbolt Cable
  • Limited 2-Year Warranty
  • Table of Contents
    • 1Description

    Promise Technology R8 specs

    Number of Bays 8 x 3.5"
    Connections 2 x Mini DisplayPort (Thunderbolt 2)
    Form Factor Desktop
    RAID Modes RAID 0, 1, 5, 6, 10, 50, 60
    OS Compatibility macOS 10.8.5 or Later
    Total Raw Capacity 48 TB (8 x 6 TB)
    Type Hard Disk Drive
    Rotational Speed 7200 rpm
    Initial RAID Configuration None
    Pre-Format None
    Dimensions (W x H x D) 12.2 x 9.6 x 7.3" / 31.0 x 24.4 x 18.5 cm
    Weight 24.2 lb / 11.0 kg
    Packaging Info
    Package Weight 32.2 lb
    Box Dimensions (LxWxH) 17.5 x 16.6 x 12.1"

    Promise Technology R8 reviews

    48TB Pegasus2 R8 Thunderbolt 2 RAID Storage Array is rated 5.0 out of 5 by 1.
    Rated 5 out of 5 by from Fast, flexible, robust storage solution The 48TB Pegasus2 R8 unit I bought is my third R8 device. I bought an R8 populated with 3TB drives, then about a year later, another one populated with 4TB drives, and now this unit, another year later, populated with 6TB drives. (Which I believe is the maximum size drive the R8 can use.) So I have a fair bit of experience with the units by now. First a comment about the five star rating. I almost took a star off because of their documentation and an issue with initial setup. But in the end I've always figured out what the units can do and how to accomplish what I need to do, and I decided it's the units' ongoing performance and reliability that really matter here. And those aspects of the product deserve five stars, IMO. I use these units for fairly large video files. Mostly just playing and archiving, but occasionally a bit of editing. I used to do this sort of thing with Firewire-based drives, and they were fast enough for playback, but these Thunderbolt 2-based R8 units are MUCH, MUCH faster. You can find rigorous performance stats elsewhere, but let me just say that a typical 1080p hour long program comes in at around 1.5 GB, and copying it to and from a Firewire drive took a while -- about 20 seconds. But copying such a file to and from these Thunderbolt 2-based R8 units takes about 3 seconds. I've even seen such a copy take place without bringing up the Finder's copy window, because it finishes before the time the Finder uses to decide it's worth showing progress. This is with a RAID 6 configuration, which does NOT do striping, so it could be made even faster; possibly as much as twice as fast. About RAID configurations... I chose 6 because it provides what, for me, seemed the best balance of data safety and available capacity. The R8's documentation does a good job of describing the various RAID levels and you'll want to decide for yourself which to choose. (The manual is online.) With RAID 6 I can lose up to two drives and still recover all my data. In the just over two years I've owned an R8, I've had one drive fail. I pulled it out, swapped in a replacement, and it was rebuilt without problems. I love the idea that even a second drive could have failed while I was waiting for the replacement disk to show up and I would still not have lost any data. That's why RAID 6 is for me. RAID 60 would give the same level of safety plus the speed of striping, but you give up a lot of capacity to have both speed and safety, and the speed of RAID 6 in these units is sufficient for my needs. So, basically, everything operational about the units is terrific. The software you use to configure and get information about the drives is a little clunky, but it's perfectly functional. Once you get used to a few of its quirks, it's easy enough to use. So what were those problems I mentioned at the start? First, the documentation, IMO, misrepresents what is possible with what they call migration. Reading it and the promotional literature you might think you could migrate from one RAID setting to another without losing data. That would, for the most part, be wildly incorrect. You can go from almost any RAID setting to RAID 0 without losing data. But that's about it. To go from 1 to 5, 5 to 6, pretty much anything to anything, except to zero, you lose all data. So their migration, despite all the verbiage about it in the manual, is pretty much useless. It annoyed me at first, but I'm over it. Second, the documentation does not cover some very basic necessities of operation. Such as, right from the start, how to actually change the RAID setting. I'll append my hard won knowledge at the end of this review. It's perfectly reasonable, once you know it, but you have to do some things, like delete your disk array. That sounded way too scary for me to even consider until I got some feedback from their support staff. Yet unless you want to live with the RAID setting they ship with, everyone has to do this. The manual should obviously provide this information and doesn't. The next basic operation you'll eventually need is to replace a failed drive. Surely the documentation covers this, right? Nope. I'll append that hard won knowledge as well. Again, it's easy enough once you have the steps laid out for you, but with no useful info in the manual, I doubt anyone would do it right automatically, and certainly not without considerable trepidation. Finally, the dreaded synchronization. When you first hook up the drive, it has to synchronize its drives; i.e., write a bunch of blocks to the drives to identify the redundancies that allow it to suffer drive losses without losing data. The manual claims this should take about 10 hours. But it actually depends on the RAID level you've chosen and probably the size of your drives. For RAID 6 with 6TB drives, it took about 70 hours. You read that right. Seventy hours. I've since replaced the 3TB drives with 6TB drives in my original R8 and when it did its synchronization, it was again about 70 hours. That's just what it takes. I can live with it, but being told it should be 10 hours is disturbing and annoying. If you Google around you'll find lots of people saying it takes 70, 80 hours, instead of 10. Yet you'll also find the occasional report of it finishing in 10 hours. Clearly the RAID setting makes a *huge* difference. But their manual says nothing of this, and even their technical support staff seemed to have no knowledge of the issue at first. So, kvetching aside, it should be obvious that since I've bought three of these puppies, I like them. The speed is good. The reliability is good. The safety of the data is good. The documentation is lacking and the synchronization is a one-time pain. All else is good. Documentation they *should* have included follows. -------------------------------------------------------- To change the RAID level on the Promise Pegasus2: *** WARNING: THIS LOSES ALL DATA ON THE DRIVE! *** (You might want to start by deleting the logical volume before deleting the disk array, but that step doesn't appear in my notes, so I'm not certain if it's required. I am certain it doesn't hurt, as I just did it with this most recent unit.) * Delete the disk array using these instructions, from page 66 in the manual: To delete a disk array: 1. Do one of the following actions: From the Dashboard window, click the Disk Array link. From the Storage menu, choose Disk Array. 2. Mouse-over the disk array you want then click the Delete button. 3. In the Confirmation box, type the word confirm in the field provided and click the Confirm button. * Then still in Disk Array pane, click Create Disk Array. Select all the drives and continue. Defaults are fine, though you may want to name the array something recognizable. * Click Logical Drive in the toolbar. * Click Create Logical Drive. Again a recognizable name is probably good. Again defaults are good. Click Add. Click Submit. * Wait... It automatically begins a synchronization background activity, that you should allow to complete before using the drive. -------------------------------------------------------- To replace a failed drive in the Promise Pegasus2: * Unmount the volume from the mac. You can use the Finder or Disk Utility or whatever. * Turn off the unit. Supposedly you can do it with the power button on the front of the unit, but I had trouble with this and used their Promise Utility software. Instructions for powering down the unit are actually in the manual, amazingly enough. * Remove the faulty drive. * Turn the unit back on without connecting a new drive. Just press the power button on the front of the unit. * Once the unit is up and running hot plug the new drive. (There is no need to turn off the unit.) It will automatically start the rebuild if the array is configured with RAID 1, 5, 6 etc.. * There is no need to format the new drive before you place it in the unit. However, if the replaced drive is detected as a Passthru drive then you will need to change the drive settings (in the Promise Utility software) to Unconfigured, and manaully start a rebuild. (I was sent a separate document 20160323041242How To Rebuild The Replacement Drive into Pegasus Unit.pdf by their tech support staff on manually initiating the rebuild.) I don't think I had to do this.
    Date published: 2016-04-13
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