NV+ V2 stalling when 80%+ full (20047616)

Skywarp wrote:
I'm looking into this issue, from the logs I see that you converted to ext3 yourself, and you're still running into the issue, right? I'm chasing down a few things, could you confirm, are you storing a large amount of small files on the device (checked volume stat, if my math is correct, average of 3.5MB per file)? Are you only using CIFS/SMB to copy files to the NAS?

I have same problems... converting volume to ext3 solve everything. This problem is related only to filesystem itself not to anything else.
This is propably kernel bug, somewhere at journaling code. I found it on Synology and QNAP forums and people are very angry because of this.
There's nothing in logs only IOWaits raises to 100% after any write is performed and system is not responsive for some seconds/speed drops to 10MB/s or lower.
Maybe disabling journaling in ext4 can help, but I don't trust this filesystem for now.

I saw this problem when volume is aprox. 85% full and I have a lot small files on it.

When you format ext3 volume you can switch to ext4 driver and in that situation everything goes wrong.
Journal must be recreated while you are going back to ext3 - if not, ext3 have same problems as ext4 (100% IOWaits).

Perfomace with nearly full volume on ext3 is ~50MB/s write ~80MB/s read - not bad for ARM platform.