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Forum Discussion
Readynas NVX extremely slow writes but extremely fast reads!
Hi there! I've a Readynas NVX which is behaving a little oddly of late. This specifically started when trying to set the network to use jumbo frames (something the rest of the devices on the network ...
Did you test the network path MTU with ping?
Hi r00x,
You may also want to test it on your PC by directly connecting your NAS via LAN (ensure static IP address is set in order for you to access it). Also, which FW is running on your system?
Kind regards,
BrianL
NETGEAR Community TeamHi there! Yes, I tested the MTU. It seemed okay up to 9000 (8972) before packets started needing to split.. Not sure what the problem is really. I've since backed the NVX back down to an MTU of 1500, yet I still get read rates of over 100MB/s and writes are still vaguely 20-30MB/s... so now I have no idea what's going on! It does seem to get rid of the problem where the first file write attempt fails/locks up though.
Could it be that it's just not that fast at writing? The disks are arranged in X-RAID2, if I recall? There's only three of them as well, as opposed to four. Perhaps the old x86 chip in this NAS just can't cope with a higher write speed than that on this array?
EDIT: forgot to add, I have also tried updating from RAIDiator 4.2.27 to 4.2.28, but it seems pretty consistent between the two versions.
The best way to test the MTU is to use the "don't fragment" option in ping. For instance ping nasipaddress -f -l 8972 You find the largest size that works, and then add 28 - that gives you the MTU of the path. http://kb.netgear.com/app/answers/detail/a_id/19863/~/ping-test-to-determine-optimal-mtu-size-on-router
It sounds like you either did that or did something similar.
Writes should be slower, since the parity block also needs to be re-written. Based on this old review of the NVX, I'd say you should be getting about 50 MB/s write speeds. http://www.smallnetbuilder.com/nas/nas-reviews/30826-netgear-readynas-nvx-reviewed?showall=&start=4
Perhaps try a test with nastester (which should be a bit more controlled/repeatable). http://www.808.dk/?code-csharp-nas-performance
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