I understand it's likely NOT an OMV issue, but I will try seeking help here nevertheless.
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I am experiencing some very slow write speeds (about 12-15 MB/s, sometimes even less than that - over a gigabit network) under Xubuntu 16.04 lately.
At first I thought it was due to the recent 3.x OMV upgrade but since it runs off a USB pendrive I immediately reverted to the old 2.x distribution and the issue is still there.
Some details about the tests I made:
- client PC is a Core i3 6100, 16GB RAM, main drive is a Samsung SSD, test data being copied to the NAS is on a separate WD Green 500GB hard disk
- network is gigabit (ethtool confirms gigabit full duplex)
- client PC has dualboot with Windows7 64bit, and NAS is working flawlessly there (100+ MB/s), as it did under Xubuntu until recently
- iperf benchmarks on both Xubuntu *and* the NAS shows about 950 Mb/s
- the network share is accessed via cifs/smb
- sometimes write speed (data used for the test is usually huge files ranging from 500 MB to 2-3 GB) goes back to normal, then horribly crawls at 1 MB/s or even less
Considering the huge performance differences between Xubuntu/Linux and Windows7 on the very same hardware I have to guess the issue isn't on the server side (i.e. the NAS) but on the client instead.
But I really have no idea what to look for, so any suggestion is surely appreciated.