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Saga continues, with some observations and tl;dr

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Marcin 2020-05-06 09:17:24 +02:00
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NAS_data_migration.md
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I was trying to migrate my data from one WD MyCloud EX 2 Ultra to another. This is my story of frustration, unanswered questions and a journey through bash + ssh. I was trying to migrate my data from one WD MyCloud EX 2 Ultra to another. This is my story of frustration, unanswered questions and a journey through bash + ssh.
## TL;DR
### Results
As of now, transfer speeds are consistently around 20-25 MB/s with the bottleneck being target drive write speed. Looking for possible causes.
### Takeaways
* To check for network performance, start with `iperf` for throughput, then `ethtool` for hardware layer and then proceed with tuning if necessary
* To check drive performance: `hdparm` and `dd` for read and write speeds, before checking transfer tools
* In this case, there is no performance difference between `scp` and `rsync`, athough if I wanted to resume broken copy process, rsync provides option to skip existing files (as a workaround in scp we can force this by removing write persmissions to already existing files)
## Initial conditions
| Parameter | Source | Target | | Parameter | Source | Target |
|-|-|-| |-|-|-|
| Device | WD MyCloud EX2 Ultra | WD MyCloud EX2 Ultra | | Device | WD MyCloud EX2 Ultra | WD MyCloud EX2 Ultra |