NAS200 - Process and CPU usage

Discussion in 'Cisco/Linksys Network Storage Devices' started by zenway, Aug 26, 2009.

  1. zenway

    zenway Guest

    Hi all,

    I've got a question about processes and CPU usage... When I do a ps -ef this is the process list I have :

    Is it normal to have 3 instances of "/usr/sbin/smbd -D" ?
    I stop UPNP support because with top command I saw many upnp instances (4?) with a huge memory consumption (36% for each processes), is it a normal running ?

    For information I use a Jac4 firmware and this is the situation after a fresh reboot...

    Another question is about transfer rate to NAS200, currently I can upload to 1MByte per second... I think is very low than usual.


    Do you have any reason of this very low rate ? My netword works fine and I do a hdparm on NAS200 with a 12MB result rate on each disk... I don't understand...

    Thanks a lot for your help :)
  2. jac_goudsmit

    jac_goudsmit Super Moderator Staff Member Member

    Yes, this is no cause for concern. I think Samba starts one instance for each session. By the way I think no matter what parameters you give the ps command on the NAS200 it will always output the same data.

    I think it's possible to stop UPnP support via the web interface if you don't need it. I'm not sure why so many instances would run or why they would take up as much space as you say.

    From your image, it looks like you're uploading two files at once, this might not be a good idea because both copying processes take up memory and the hard disk will be doing a lot of seeking (thrashing) between writes of buffers. Your performance will probably be better if you only do one file at a time.

    The hardware in the NAS200 is just very very slow. It runs as slow as a 100MHz 80486 PC. And probably some of the drivers could use some improvement.

    Expect no more than 4 megabytes per second upload speed (network->disk) in the best situations (non-journaled file system, no other processes running on the NAS, quiet network, sunny day, head wind etc). Download speed (disk->network) is slightly higher: up to 6MB/sec on non-journaled file system. Using a journaled file system or encryption or whatever, will decrease speed.

    If you want a faster NAS, the NAS200 is not a good choice. You should go to and look at some of their charts. The NAS200 is somewhere near the bottom on the speed axis, but also near the bottom on the price axis. In other words: you definitely get what you pay for...

  3. alejandro_liu

    alejandro_liu Addicted to LI Member

    I noticed also if you are doing a large file copy on one system, other systems trying to access your NAS200 at the same time would slow to a crawl...
  4. Treah

    Treah Addicted to LI Member

    I am also doing some looking around in the nas200 to figure out why the transfer rates are so low. I don't think this is a product of the processor speed because ive worked on some lower end machines in my day ( 133 75mhz systems) and I am pretty sure they had better rates. Then again the systems I used to work on had dedicated hardware for the Network interface which in my opinion has always given the best performance anyway.
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