On 9/21/20 8:50 PM, John Jason Jordan wrote:
On Mon, 21 Sep 2020 17:39:08 -0700
Tomas Kuchta <[email protected]> dijo:
My point was - Thunder bolt is maximum of 4 pcie3 lanes. It cannot
supply enough bandwidth to saturate more than single, not to mention
four 4x PCIe3
- striped 16GB array of NVMe is likely to cost multiple thousands $$.
There is even less point spending 2x of that on pcie4 NVMe solution.
The thing is, even if I have only 16 lanes, I'm not going to be using
all the drives in the array at the same time. And surely there is a
controller somewhere in the setup to shuffle I/O to the next available
route. Even if I can't get the maximum that the NVMes are capable of,
it's got to be worlds better than what I'm using now.
Setting up a 20-24TB RAID0 with NVMe drives is not easy to figure out.
Apparently I'm the first one ever to do it.
You are opening a can of worms looking at NVMe drives for this use case.
NVMe and PCIe storage in general is still in a state of flux and subject
to change. Hotplug support hasn't even been standardized yet so there
are things that just don't exist yet for end users. There's also a mess
of compliance issues with different drives. Many SSD's don't behave as
you expect from the advertising material.
Thunderbolt is also an issue in and of itself. Generally speaking,
Thunderbolt is considered a dead protocol and will probably end up in
the same place as firewire and eSATA. I recommend against it.
You probably just need a 2 or 4 bay SATA enclosure that implements RAID.
Either Direct Attached (DAS) or Network Attached (NAS) depending on how
you intend to use it. If you want I could make a recommendation but full
disclosure - I work for one of the companies that sells this type of
gear so I'm going to be biased ;-)
-Ben
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