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???
02/14/09 10:18
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 		 #162399 - 1.5GB/minute reasonable for backup to USB2 disk
Responding to: ???'s previous message
A reasonable figure for writes to USB 2.0 disks (unless using very small block sizes) should be maybe 25MB/s, which corresponds to 1.5GB/minute or about 11 hours for 1TB. Individual USB chip will affect this a bit but getting more than 25% lower transfer rates should be a reason for a closer check. Significant fragmentation on one or both of the disks will lower the speed, but not make it grind to a halt.

The best alternative for larger backup to external disk is probably ESATA, with FW800 not far behind since the disk will be the limiting factor. The only Gbit NAS I have tried is the D-Link DNS-313 and in my setup it is way slower than all my USB 2.0 disks, and only meaningful as a remote backup destination in another building for geographical protection from fire or theft.

List of 32 messages in thread
TopicAuthorDate
How would you guys do it?            01/01/70 00:00      
   Not sure Windows can do it            01/01/70 00:00      
      High-speed USB and a buffer            01/01/70 00:00      
         USB for DOS?            01/01/70 00:00      
            once you remove all the potential source...            01/01/70 00:00      
               Latency is the problem - not the transfer rate            01/01/70 00:00      
                  You're right ... it's the latency            01/01/70 00:00      
                     Just one machine?            01/01/70 00:00      
                        Nope ... it seems that all Windows boxes are slow            01/01/70 00:00      
                           The hw shouldn't be hobbled            01/01/70 00:00      
               I'd love to use USB, but lack faith in the OS            01/01/70 00:00      
                  Try other PC or deactivate devices if you get lockups            01/01/70 00:00      
                     this all puzzles me            01/01/70 00:00      
                        1.5GB/minute reasonable for backup to USB2 disk            01/01/70 00:00      
   lantronix xport ??            01/01/70 00:00      
      How would that help?            01/01/70 00:00      
   with PCI or ISA with dma            01/01/70 00:00      
      gigabit ethernet?            01/01/70 00:00      
         Gbit normally overkill            01/01/70 00:00      
         I've considered that ... I don't like the overhead            01/01/70 00:00      
            economical ways            01/01/70 00:00      
               Do those work with DOS?            01/01/70 00:00      
                  any of OS will do...            01/01/70 00:00      
            100Mbit Ethernet on 8051            01/01/70 00:00      
   Firewire will do it            01/01/70 00:00      
      That's probably too much overhead!            01/01/70 00:00      
   LVDS to PCI card            01/01/70 00:00      
   re: how            01/01/70 00:00      
      It's not that simple            01/01/70 00:00      
         ESCC is the best option            01/01/70 00:00      
         do you REALLY think            01/01/70 00:00      
            Shouldn't be a problem            01/01/70 00:00      

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