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List:       opensuse
Subject:    Re: [opensuse] Spec'ing a 50 TB dedicated storage subsystem and room to grow?
From:       suse () a-domani ! nl
Date:       2019-02-22 16:29:54
Message-ID: 0a07dcd674ae7a456b3ac4c788f07ea0 () a-domani ! nl
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On 2018-02-23 18:01, Greg Freemyer wrote:
> All,
> 
> I bought a used iSCSI based Drobo in 2016 with 50TB in it.  It works
> great, but it isn't fast by today's standards.  (100 MB/sec absolute
> max). And I never got it to work from openSUSE (Windows and Mac did
> work).
> 
> I now need to buy something similar, but with fast I/O and Linux
> support: 10 Gbit Ethernet and fibre-channel may be my only options?
> Or are there point-to-point SAS external racks I should consider?
> 
> Also, I will likely want to put a SSD based cache in the mix at some
> point.  It could be integrated into the storage subsystem, or I could
> use something like bcache and have the SSD be in the server,.  It just
> needs to be reliable and fast.
> 
> Recommendations? (I'm thinking used and $10K at the high-end for the
> subsystem including PCIx cards and switches, if needed.)
> 
> == details
> 
> I need to buy a server with 50TB usable disk for a production
> environment.  A high speed disk subsystem is critical. And the project
> may scale up over time.
> 
> It doesn't need to be a fail-over cluster, just a single server.  I'm
> looking at used equipment most likely.
> 
> I was thinking one with 4 CPU sockets would let me start with 2 CPUs
> and then expand to 4 later on.  Lots of RAM capacity would also be
> great.
> 
> My first thought was to get a Dell R920 and throw a bunch of disks in 
> it.
> 
> https://goo.gl/images/x3Rfj2
> 
> 24 disk slots!
> 
> But then I looked at what size drives are available for those slots:
> 2.5 inch.   I only see 2TB drives max.
> 
> I'm hoping to use a Dell server because it's the preferred brand at my
> (new) job.  Unless I'm missing something a standalone rack mount Dell
> won't work.
> 
> So, now I'm looking at a used R820 most likely and some sort of disk
> subsystem to support it.  I picked it because it is only a 5-year old
> design and it has 4 CPU sockets I can expand into as the server demand
> increases over time.  Also 3TB max ram is way above what this will
> require, even long term.
> 
> https://media.adn.de/media/DE/DocLib/Poweredge_Easy_Matrix.pdf
> 
> A used, barebones R820 can be had for under $2K.  Just add CPUs and 
> ram.
> 
> Greg

Is single node a strict requrement?
Why not a small ceph-cluster, three OSD-nodes, each with four 
Barracuda-8TB drives?

Hans

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