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170 posts

Master Geek


  #2484708 15-May-2020 23:02
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fe31nz:

 

 

 

That used to be the case, but these days there are plenty of spinning rust drives that are faster than gigabit Ethernet.  1 Gbit/s = 125 Mbytes/s - actual speed will be less due to the protocol overheads.  Take a look at this for an example of a fast modern enterprise class drive:

 

https://www.pbtech.co.nz/product/HDDSE90160/Seagate-35-16TB-Enterprise-Capacity-Exos-SATA-6Gbs

 

Note the maximum sustained transfer rate of 269 Mbytes/s.  I have a slightly older ST14000NM0018 model and two ST12000NM0007's and yes, they really are that fast.  And in a speed oriented RAID setup with multiple drives, even older drives will work faster than 1 Gbit/s.  I would love to have a 10 Gbit/s network - it is a pain moving huge video files between these drives over just 1 Gbit/s.

 

125MB/s sounds reasonable.     269MB/s would be burst rate when reading from cache. It's not an accurate measure of HDD performance.

 

I take your point re: Mbps & MB/s. I forgot about that ;)

 

 

 

 

 

 

 

Jase2985:

 

yeah na, a standard sata 6gb drive will sit at 200-300MB/s sustained writes, which is faster than the 125MB/s that Gigabit Ethernet allows

 

Can you point me to a mechanical HDD which has a sustained read speed of 300MB/s?


565 posts

Ultimate Geek


  #2484722 16-May-2020 00:40
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K8Toledo:

 

fe31nz:

 

That used to be the case, but these days there are plenty of spinning rust drives that are faster than gigabit Ethernet.  1 Gbit/s = 125 Mbytes/s - actual speed will be less due to the protocol overheads.  Take a look at this for an example of a fast modern enterprise class drive:

 

https://www.pbtech.co.nz/product/HDDSE90160/Seagate-35-16TB-Enterprise-Capacity-Exos-SATA-6Gbs

 

Note the maximum sustained transfer rate of 269 Mbytes/s.  I have a slightly older ST14000NM0018 model and two ST12000NM0007's and yes, they really are that fast.  And in a speed oriented RAID setup with multiple drives, even older drives will work faster than 1 Gbit/s.  I would love to have a 10 Gbit/s network - it is a pain moving huge video files between these drives over just 1 Gbit/s.

 

125MB/s sounds reasonable.     269MB/s would be burst rate when reading from cache. It's not an accurate measure of HDD performance.

 

 

It really does seem to be that fast.  Take a look at this review (the first one that showed up on Google for me):

 

https://www.kitguru.net/components/hard-drives/simon-crisp/seagate-exos-x16-16tb-hdd-review/7/

 

I would not expect any sane drive manufacturer to advertise a drive as having a sustained transfer rate like that unless they could actually show the drive does it, and sustains it for long periods - that would be just asking to be sued or prosecuted depending on the jurisdiction.  Of course, they would do the testing under ideal conditions - likely with a minimal operating system, or using dd to copy directly to the disk bypassing the filesystem.  Real life on real systems would be a bit slower.

 

The burst rate into cache is much higher.  Some of the random write tests in that review were giving insane numbers - clearly their caching algorithm is excellent.

 

I can not really test it myself, as I do not have any spare SATA ports on the PC I have it on.  It is in a USB 3 external drive mount.  I am using it for its capacity, not its speed.  It is also quite noisy so I do not want it to be used 24/7 as it is in my bedroom, on my MythTV box.


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