[kwlug-disc] Data transfer speeds SATA to SATA

[B.S.]

I don't expect it has so much to do with the CPU as the associated south bridge, the beastie handling the mass storage connectivity. 
https://en.wikipedia.org/wiki/Southbridge_(computing) The CPU association is common though ... can't exactly put an Intel Southbridge on an AMD CPU, I expect.

As for speed, make sure everything in the chain is SATA III, I suppose, and I expect being on different controllers will help. e.g. My motherboard has both the 'stock' sata connections that come with the intel cpu and another onboard controller. There are PCIe cards at Canada Computers for under $50 - assuming you're not loading up the bus otherwise at the time. Can't say how significant, if any, separate controllers would bring to the party, but I expect it would have to be some.

No doubt not interrupting the I/O will help, but as noted presumably peeking at things (remotely) is only a blip in the duration. iotop should show you the copy as being the only thing beating the i/o to death.

If this is one off, probably not worth a further investment. If it isn't, you're going to want the backup on different hardware, and at that point net i/o will be the bottleneck, not the local hardware itself. Even a PIII can probably keep up with SATA II over a gigabit network, writing even. Run overnight, whether it takes 5 minutes or 15 to finish a backup probably won't matter to you.

I thought SATA IV was coming, but looks like it's only up to 3.2 
https://en.wikipedia.org/wiki/Serial_ATA#SATA_revision_3.2_.2816_Gbit.2Fs.2C_1969_MB.2Fs.29 / SATA Express. If the motherboard, drives, cards, all support the latest and greatest.

I see 6TB drives are at Canada Computers ... for only $359. 8-) 
http://www.canadacomputers.com/product_info.php?cPath=15_1086_210_212&item_id=078864

No stock, of course.



----- Original Message -----
> From: William Park
> To: kwlug-disc at kwlug.org
> Cc: 
> Sent: Tuesday, September 22, 2015 5:06 AM
> Subject: Re: [kwlug-disc] Data transfer speeds SATA to SATA
> 
> On Mon, Sep 21, 2015 at 11:23:25PM -0400, Andrew Kohlsmith wrote:
>>  > On Sep 21, 2015, at 10:50 PM, William Park wrote:
>>  >> The motherboard is a bit older (Socket 775/Core 2 generation), not 
> sure if
>>  >> an upgrade would help (I'd probably buy an inexpensive Socket 
> FM2+), but if
>>  > 
>>  > Forget AMD.  Go with Intel.
>> 
>>  While I too prefer Intel over AMD, I don???t think the CPU is actually
>>  doing much to help or hinder the transfers. Everything will be DMA???d
>>  from one buffer to another, with the CPU just minding the transfers
>>  and waiting for them to complete. 
> 
> Yes, when I said "Intel", I meant Intel cpu, chipset, and motherboards
> are better.  I had AMD 8-core 125W system, and it would choke when doing
> any IO.  The cpu/memory bandwidth was ok, judging by kernel compile
> times.  I replaced it with i3, because I could no longer afford
> electricity.