Which HDDs are best for replacement in a PegasusR4?

  • 3.9K Views
  • Last Post 28 December 2016
Benjamin Markus posted this 26 October 2016

I own a Pegasus2 R4 8TB RAID5 made up of 4x physical 2TB HHDs with 6TB logical capacity.  I use this as a work drive and it's been great, but I have less than 1TB of space left on it and I'm looking to upgrade.

Meanwhile I've been doing a bunch of work on another 6TB software RAID0 made up of 3x 2TB Western Digital desktop drives, all USB3.  This RAID0 array was fast enough for what I needed it for at the time, but none of these drives were designed to be used in a RAID and two of them are showing signs of pre-failure and are most likely on their way out.  

I've backed up this RAID0 array using another concatenated RAID of 3x desktop drives, some USB2, some USB3, all of which are old, slow and will most likely need replacement soon as well.  I'm tired of dealing with these desktop drives and I would like to move my entire storage system over to the Pegasus2 system, but I'm unsure what the most cost effective way of doing this would be.

My initial idea was to remove all the 2TB HHDs from my R4, all of which are still functional, put them in a safe offsite for added backup insurance, and replace them with 4x 4TB HHDs or even 4x 6TB HHDs.  However, I checked the latest Pegasus2 Compatibility list and it looks like there are only two drive models that the R4 was tested with and ships with, a Toshiba 3TB and a Toshiba 2TB.  It says any of the drives listed there should work in all systems, but are untested in some models.  Does that mean it's risky to use drives larger than 3TB in the R4?  If Promise hasn't tested it, have any other customers tested a set of 4x 4TB or 4x 6TB HHDs in the R4?

I need, at the very least, 12TB logical capacity, but even more space would be ideal.  If I understand correctly, 4x 3TB HHDs will leave me with 9GB logical capacity, which is too small, and even 4x 4TB HHDs will leave me with exactly 12TB logical capacity, so ideally 4x 6TB drives would be the best as it would leave me with 18GB logical capacity and 4TB of free space once all data is transferred over.  Therefore, I'd love to know if it's even possible and/or recommended to put 4x 6TB drives into the R4.

The price of 4x 6TB Toshiba models in the compatibility list adds up to around $850.  If going through the trouble of replacing all 4 drives is going to be a hastle, perhaps it's better to simply jump to a higher price point and invest in an 18TB Pegasus2 R6.  The 15TB logical capacity would leave me with 9TB of free space once I transfer over my 6TB of data from the RAID0 array, and that combined with the added speed of the R6, could make it a worthwhile investment.  However, I'm also wondering if there will be any loss in speed from daisy-chaining the R6 to the R4 or vice versa?

Any input would be greatly appreciated.  Thanks.

  • Liked by
  • Yu Qin
Order By: Standard | Latest | Votes
Paul Harmer posted this 26 October 2016

Hi there, I'm in the same boat and am casting around for advice on the best way of swapping the drives out on my Pegagsus2 R4, although I'm content to keep the same capacity as it shipped with (8TB) and want to start afresh with an empty array.

I want to keep the original drives as backup and be able to install them easily to access old data.

As I see it I have three options: buy a whole new R4, buy four new drive modules from Apple or another reseller, or buy four naked drives and install them into the exisisting caddies.

What's the best solution?

Thanks,

Paul

  • Liked by
  • Yu Qin
Venkatachalam Settu posted this 27 October 2016

Hi Benjamin,

As per the compatibility list, Pegasus2 R4 can support 2 TB or 3 TB drives. It doesn't mean that larger capacity drive cannot be used if it is not in the compatibility list. We can see that there are many customers using large capacity drives in the R4 unit. But we will not be able to diagnose if any performance issue occurred on those drives. The compatibility sheet has the list of current qualified and supported compatible products. If it is on this list then it has been tested and approved for use. If it is not on this list then it is not officially supported i.e. it has not been tested, it may or may not work.

You can go ahead with Pegasus2 R6/R8 which will give you appropriate storage capacity. It is always recommended to connect Pegasus2(R8/R6/R4) then Pegasus first generation for daisy chaining to avoid the bottleneck.

Thank you.

  • Liked by
  • Yu Qin
Venkatachalam Settu posted this 27 October 2016

Hi Paul,

It should be based on your project requirement and cost. You can go ahead with the higher capacity drives which are listed in the compatibility list or buy a new Pegasus2 R6 with large capacity drives.

Please use the below link to download the Pegaus2 compatibility list.

http://promise.com/DownloadFile.aspx?DownloadFileUID=4279

Thank you.

 

 

 

 

 

john Smith posted this 21 December 2016

i'm looking for a new 4TB HDD,

can anyone help me to find the best one?

 

 

i found this article on google

http://www.deskdecode.com/top-best-4tb-hard-disk-drive-monthly-updated/

and they suggest me to buy Seagate Barracuda.

how about that?

 

 

 

Venkatachalam Settu posted this 28 December 2016

Hi John,

We have 4TB compatible different brands drives (Seagate,Toshiba & HGST) are available on the compatibility list. The compatibility sheet has the list of current qualified and supported compatible products. If it is on this list then it has been tested and approved for use. If it is not on this list then it is not officially supported i.e. it has not been tested, it may or may not work.

Here is the link to download the Pegaus2 compatibility list.

http://promise.com/DownloadFile.aspx?DownloadFileUID=4279

Thank you.

Yu Qin posted this 28 December 2016

As I see it I have three options: buy a whole new R4, buy four new drive modules from Apple or another reseller, or buy four naked drives and install them into the exisisting caddies.

What's the best solution?

Thanks,

Paul

Dear Paul,

 

Where are you based? Europe, US, Australia, or...? I'm just curious.

Close