From 844e0ce77744bd00601ae92f97a976e8af522bef Mon Sep 17 00:00:00 2001 From: Marcin Date: Wed, 6 May 2020 09:17:24 +0200 Subject: [PATCH] Saga continues, with some observations and tl;dr --- NAS_data_migration.md | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/NAS_data_migration.md b/NAS_data_migration.md index 6b44779..b4d7fd6 100644 --- a/NAS_data_migration.md +++ b/NAS_data_migration.md @@ -2,6 +2,20 @@ 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 | |-|-|-| | Device | WD MyCloud EX2 Ultra | WD MyCloud EX2 Ultra |