I have an RN316, a 428, and an Ultra4. On the 428 and the Ultra4, when I SSH in via Putty, I put i nmy username and then immediately, the password prompt appears. With the RN316, it takes up to 30 seconds for it to appear. Does anyone know what could cause the system to be slow like this?

Do you have disk spindown enabled on the RN316?

Nope... although that would have been awesome if it were the case :)

Once you do get in, perhaps run top and see if something is hogging the CPU. Maybe also check the disk health, and the fullness of the OS partition.

root@NAS:~# btrfs fi us /data | grep unall Device unallocated: 4.39TiB root@NAS:~# btrfs balance status -v /data Balance on '/data' is running 560 out of about 4334 chunks balanced (19676 considered), 87% left Dumping filters: flags 0x7, state 0x1, force is off DATA (flags 0x2): balancing, usage=78 METADATA (flags 0x2): balancing, usage=39 SYSTEM (flags 0x2): balancing, usage=39 root@NAS:~# df -h Filesystem Size Used Avail Use% Mounted on udev 10M 4.0K 10M 1% /dev /dev/md0 4.0G 3.1G 779M 81% / tmpfs 992M 0 992M 0% /dev/shm tmpfs 992M 5.3M 987M 1% /run tmpfs 496M 11M 485M 3% /run/lock tmpfs 992M 0 992M 0% /sys/fs/cgroup /dev/md127 37T 29T 7.4T 80% /data /dev/md127 37T 29T 7.4T 80% /home /dev/md127 37T 29T 7.4T 80% /apps After 13 days, it's at 87% left on the balance. Any ideas?

Did you start this balance from the web ui, or from ssh? If the latter, do you recall what parameters you used? Also, your OS partition is very full. What have you installed on it?

Slow login | NETGEAR Communities

11 Replies

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StephenB
Guru - Experienced User
Jun 02, 2018
Do you have disk spindown enabled on the RN316?
- joe_schmo
  Tutor
  Jun 03, 2018
  Nope... although that would have been awesome if it were the case :)
  - StephenB
    Guru - Experienced User
    Jun 03, 2018
    Once you do get in, perhaps run top and see if something is hogging the CPU. Maybe also check the disk health, and the fullness of the OS partition.
Danthelf
Star
Jul 19, 2018
Do you have the NAS joined to AD or did you ever have it joined to AD? I never really investigated it further but my NAS is doing the same and I seem to recall it started happening after I joined the NAS to AD, despite having now switched back to 'Local Users'.

Don't know if I'm just imagining things but at least I think that's when it started.
- Danthelf
  Star
  Jul 19, 2018
  For the sake of it I decided to look in to this further, so in order to find out what was going on I did a packet capture while logging in. The reason for the slowness is because the SSH server will attempt to do a reverse DNS lookup the hostname of the client you're connecting from before presenting you with the password prompt, so if your DNS settings are misconfigured it will have to wait for that to timeout before presenting you with the password prompt.
  
  The reason why I found this to be related to me joining the NAS to my AD domain is simply because at the time I modified my DNS settings to use:
  
  1) My DC's IP
  
  2) google DNS
  
  My DC is currently turned off (this is a home lab) so of course it will not respond to DNS queries. Removing it from the list of DNS servers resolved the issue and logins are now instant.
  
  You can also stop the ssh server from attempting lookups by adding "UseDNS no" to your sshd_config
  
  # echo "UseDNS no" >> /etc/ssh/sshd_config # systemctl restart ssh
  - StephenB
    Guru - Experienced User
    Jul 20, 2018
    Thx for posting the root cause and solution to your problem :smileyhappy: