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Forum Discussion
Slow USB backup speed - ReadyNAS Pro 6
Hi all,
I am trying to backup my ReadyNAS Pro to an external USB drive connected to a back USB port, however, the backup speed is incredibly slow. There is approximatly 2 TB of data on the NAS...
Thanks for the suggestions. I checked and the cluster size is set to 4 KB. The SMR idea is a possibility, I think it is an SMR drive. Unfortunately I don't have a standard drive around to test with right now.
I feel like the speeds I'm getting are still low for writing to a previously empty SMR drive, since it would not have to overwrite previous tracks, but I don't really know the details of how this operates.
I guess I'll have to find a different drive to test with if I want to narrow down the issue further.
David_H wrote:
I feel like the speeds I'm getting are still low for writing to a previously empty SMR drive, since it would not have to overwrite previous tracks, but I don't really know the details of how this operates.
I don't think the disk knows that it doesn't have to overwrite, since it isn't file-system aware. The only mechanism would be if it is aware of never-written tracks. That seems unlikely, though I guess it is possible.
Back when these drives were first introduced, there were driver modifications made in linux to improve their performance. But the pro-6 was already near end-of-life when that happened, and they weren't back-ported to it. That's why I am thinking that you might get better speed if you back up over the network (connecting the drive to a PC).
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