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

janforman wrote:

hauser wrote: janforman wrote: 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. i did a fresh format of the volume to ext3 so shoudn't have any left overs from the ext4 setup. i first had issues with ext4 at ~540gb left converting to ext3 started giving issues now at around 1.1tb free, so it has to be something more with a bad kernel/driver build from NETGEAR i would assume. never had any of these issues with any of my other linux systems approaching full disks ever! and i've used ext3/4 for all of them. edit: i also only get about 20-25mb/sec write to the device typically even for large files ~2gb. but that's good enough write speeds for me, if i wanted faster i would just use internal disks. Are you using ext3 driver? If you mount ext3 partition with ext4 driver problem still exist under ext3 driver (you must drop and recreate journal). I have 50MB/s write performance (my hardrive cannot do more - it's his limit) My system utilization is now: 10% CPU, 66% System, 3% IO Waits / 50MB/s constant writing (3GB data) - WD Green AV-GP HDD (when I put this drive to my PC I cannot get more than 50MB/s) RAIDiator 5.3.7 WriteCache ON pretty cool :-)

process i used to drop to ext3:
vi /etc/fstab -- changed: ext4 to ext3 for mountpoint /c
reboot
mkfs.ext3 -m 0 /dev/c/c
reboot

so i would assume that it's a fully fresh ext3 volume journal included as that's what mkfs does -m 0 just sets the root reserved blocks to 0% at time of creation so don't have to tune2fs it down to 0% from the default of 5%