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Actual Speeds?

Discussion in 'Cisco/Linksys Network Storage Devices' started by jigsaw_tech, May 9, 2005.

  1. jigsaw_tech

    jigsaw_tech Network Guru Member

    Hello all,

    I was doing some testing and I have pretty much come to the conclusion that this device will consistently backup 1.2Gigabytes of data every 15 minutes. If my calculations are correcy that means that it backs up about 80Megs a minute, which is about 1.33333-----MB a second.

    Therefore jumping up to Gigabyte lan should increase the backup speed by 10 fold. Can anyone validate this?

    I am using HandyBackup to do backups. I think it is pretty sweet and simple. Does a nice job. http://www.handybackup.com

    Hope everyone gets involved in this. I would still like to see what other people are getting on their connections.
     
  2. Guyfromhe

    Guyfromhe Network Guru Member

    unless it's linked to a 10 mbit switch/hub the theoretical maximum speed for a 100 mbit link is 12.5 MBytes / sec (overhead will bring it to somewhere between 10-11 and depening on device, etc) if you're only getting 1.3 mbit on a 100 mbit link it's the device or the NIC that can't handle the speed also it probably doesn't have a gigabit nic in it so i won't work at 1000 mbit anyway.
     
  3. jigsaw_tech

    jigsaw_tech Network Guru Member

    Nice to see that there are others on here at the same time.

    Thanks for the reply.. let me tell you about the network.. both the machine and the server have 100MB Nics, they are set to 100 Full Duplex and normall when FTP'ing from the machine to the server over the local lan I get about 11 to 12.5 MBs as stated in your response.

    The Speed however to the enclosure on the other side of the NSLU2 only transfers at the previously noted speed. In my personal opinion I am not happy about it, but unless someone can say yeah.. I backed up my machine this was the start time and end time and the size transferred ( I believe that 1.2GB was Backup set summary: 506 directories, 5,160 files, 1,178,266,386 bytes. ) I am going to have to believe everyone gets that speed.

    Or... Something is wrong with my unit ;)

    Any suggestion or other test specs? Please let me know.. I would like to see what others are getting....
     
  4. Guyfromhe

    Guyfromhe Network Guru Member

    i don't have one of these but it could be the speed the unit can process data comming into it and write it at it could be (if it's using a laptop hdd) their slow at reading/writing data compared to a regular desktop hd, etc... not sure if theres much you can do about it though but gigabit isn't going to help this device.
     
  5. Guyfromhe

    Guyfromhe Network Guru Member

    just did a quick check I can't find any spects on the xfer speed of this device, it uses a regular hdd so the laptop hdd thing wouldn't apply and the drives should be able to transfer quicker than that... hopefully someone who has one of these can comment on the speed they get, have you tried asking linksys support about it yet?
     
  6. mapper

    mapper Network Guru Member

    The performance of my nslu is the same, I am using a 100mbps router and network card.

    The limitations of the nslu are determining the data transfer speed, as the lan is hardly being utilised at all.

    remember the nslu is runnng linux on a 200mhz arm processor.

    have a look at this

    http://www.nslu2-linux.org/wiki/Info/Performance

    This websate is a mine of information.
     
  7. Guyfromhe

    Guyfromhe Network Guru Member

    i kind of expected them to resuse that 200 mhz processor thats probably the bottleneck...
     
  8. jigsaw_tech

    jigsaw_tech Network Guru Member

    Hello again,

    Well, if you change the setting on the handybackup software to compress the data before backing it up it changes things dramatically, since it is one file.

    The same 1.2GB file as a compressed zip file backups as the following.

    Current timestamp directory is "May 09, 2005 (13.45)".
    STATUS:> Building listing...
    STATUS:> Loading an index file...
    STATUS:> Index file does not exist.
    STATUS:> Backing up file "D:\maintenance.zip"...
    STATUS:> Storing an index file...
    STATUS:> Updating remote index file...
    STATUS:> Summary:
    STATUS:> Status: SUCCEEDED
    STATUS:> Files backed up: 1
    STATUS:> Backup operation finished on Monday 09.05.2005 13:49:18


    That is about 5 minutes. Which compressed is about 900 megs, which means it is backing up at 180MB per minute or 3MBs pers sec. About 3 times faster then a file backup.

    I think I will have it zip prior to backup from now on. Thanks again for the replies.
     
  9. Guyfromhe

    Guyfromhe Network Guru Member

    if you were coping individual files seperately over the network that adds ALOT more drive write time and processor time to the operation, one file will give you significantly better preformance on any device...
     
  10. Panick

    Panick Guest

    I don't have a NSLU but I do use my modded XBox as a backup drive and I find that if I copy lot's of small files it consistently tops out at 1.2-1.5 MB per second. If I transfer larger files it tops out at the same 3 MB/s you are getting and the XBox has a 733Mhz CPU so I doubt that it's a cpu limitation. Seems that this may be some sort of disk limitation when copying over a network.
     
  11. Guyfromhe

    Guyfromhe Network Guru Member

    not only does the xbox have a crappy CPU it also has a crappy nic... theres not some new magic limit that shows up when your using a network on the harddrive itself
     
  12. BiffoTheBear

    BiffoTheBear Network Guru Member

    I did a trial copy on XP of 3.67gb 18 folders 142 files from my Maxtor C drive to WD USB 2.0 250gb on port 1 of the NSLU2 via a Netgear router. It took about 15 minutes, which I make about 4mb per second. These were quite large media files and so performance could be a lot slower with many smaller files.

    I then started the drive back up on the NSLU2 and this ran for about 20 minutes. I am surprised that this took so long? Is this due to contention on the USB 2 bus, NSLU2 CPU speed limitation, is the whole disk copied (even unused blocks) or does the backup include a verify pass?
     
  13. ajnodine

    ajnodine Network Guru Member

    DU Meter States: 1.97 mb's a second with a single user!! It goes down when there's more than 1 user accessing the NSLU2

    note: This is with the NSLU2 overclocked cpu
     
  14. d__l

    d__l Network Guru Member

    Biffo, your throughput transfer speeds are about 33 mbps (the "b" is bits) which is comparable to the maximum 30-40 mbps speeds I've seen reported elsewhere.

    My fastest speeds when I FTP a single large file to either the HD or flash drive on my NSLU2 from my 4200 rpm laptop drive are only about 20 mbps. I'm sure my laptop's drive is the limiting factor here.

    The NSLU2 is no speed demon and no one should buy it as such.
     
  15. BiffoTheBear

    BiffoTheBear Network Guru Member

    DL - sure 4MBps (or 32mbps) is fine with me.

    My C drive is 7200 rpm I think so your theory about your laptop disk speed seems about right.

    Any thoughts on how the drive backup works or why it appears to be somewhat slower than copying from my C drive?
     
  16. d__l

    d__l Network Guru Member

    I've no idea about the internal drive to drive back ups. I can't do my own testing because I only have one USB HD and several flash drives.

    If the back up speed is too slow, you might think about voiding your warranty and fully clocking your CPU by the removal of the R83 resister: http://www.nslu2-linux.org/wiki/HowTo/OverClockTheSlug No one has actually reported that this speeds up back ups though, only that it improves GUI page response and maybe increases some read/write throughput.

    I've not tried this mod yet, but I've already voided my warranty by attaching a remote switch to the circuit board so that my NSLU2 can be remotely powered up or down over the internet. LOL so I guess I can't kill my warranty any more than it already has been.
     
  17. BiffoTheBear

    BiffoTheBear Network Guru Member

    No I'm not that worried about NSLU2 drive backup speed as I will set it to run overnight anyway. I was just curious as to why it appeared to be slower to copy drive 1 to drive 2 than copying from a PC drive to drive 1.
     

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