DSM-G600, DNS-3xx and NSA-220 Hack Forum

Many small files is always going to be slower than transfering large files.
You get a lot of overhead when it comes to many files.

kuya...,

your 15MB/s for large files matches perfectly what I see on my DNS323.
Smaller files bring down the rates a lot indeed - due to the overhead frodo mentioned.

There is a thread here where people are comparing their transferrates:

http://dns323.kood.org/forum/t738-Surve … Rates.html

200 MB/s is something that surely cannot be reached with any device in the DNS323 priceclass.

Cheers,

Emacs

kuyawsadabaw wrote:

But are these speeds (4 MB/s for many small files, and 15 MB/s for >1GB contiguous file) characteristic of what people usually get?

I'm just really confused because I've seen post that indicate speeds from what i've mentioned to hundreds (~200mbps, 200 MB/s).

Maybe it's just a misuse of mbps and MB/s. I don't know, but I'd like to know if my speeds are comparable to yours (MB/s, Megabytes per seconds)?

According to the box - up to 23MBps-Read and 15MBps-Write (183Mbps-Read and 120Mbps-Write) - I haven't paid particular attention to the read/write aspects, but the best numbers I have are 70~75Mbps on 100 Mbps ethernet and 140~150Mbps on gigabit.

Here are a couple of things to consider in your quest - this device is one end of a series of things in a chain.  The maximum throughput will only be as fast as the slowest device in the chain - whether or not your speeds are comparable to mine tells you very little, unless you know the rest of my chain.

Starting with the disks themselves.

Small files will require the drive heads to be jumping back & forth between the directory area and the actual file storage areas - are the seek times of our disks comparable?  Large files allow the head to hop from one sector to the next without thrashing - assuming that there is minimal fragmentation - but then actual transfer is limited by the interface - ATA66/ATA100/ATA133 - SATA - and the rotational speed of the disks 4200/5400/7200/10000/15000 rpm.

Network interfaces come next - are we using integrated NICs or are they in expansion slots - PCI33/PCI66 - PCI-X - PCI-E - and are the drivers optimal for the OS - I've seen cases where using Realtek drivers doubles the throughput over using Windows drivers.

Whilst it may be reassurring to know how our numbers compare - the stark reality is - the numbers don't mean much.

Same speed as I see. Large files over Cifs do 15000KB/s, lots of small files and the speed drops dramatically.
You might want to check the speed of your disk while doing random reads ands writes for these kand of files. It is not much better

From another test I have read somewhere there is hardly any speed difference while using Raid0 or Raid1. Guess that aspect is not the decisive factor in the speed of the box. I assume it is to be found somewhere in the cpu that controlls the networkinterface. 18000 KB/s over ftd and 15000KB/s over smb/cifs (larger protocol overhead) might translate in similar networkspeed.

Last edited by Speijk (2007-08-30 08:41:15)

Standard units: http://physics.nist.gov/cuu/Units/binary.html