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Forum Discussion
NAS drops off network after a few mins/hours
Hi all,
I have a customer with a Netgear ReadyNAS Pro, with 6x WD 1TB drives. The drives are on the hardware compatibility list.
We have it connected to a HP 1810 switch, with NIC teaming enabled (round robin). There is 3 (physical) HP servers that then back up to it via Shadow Protect over the LAN. 2 of those 3 servers have a 4-cable NIC team also, allowing for 4GBit of bandwidth each.
This setup has been working fine for 6-9 months or so, but all of a sudden the NAS has started failing.
About 5-60 minutes into a Shadow Protect backup, the NAS will stop responding to ping, and essentially drop off the network. Network lights still stay active on the NAS.
The switch will also log errors such as: "Excessive CRC/Alignment Errors on port 14" or "Excessive broadcasts detected on port 14" or "Excessive jabbering detected on port 20". The NAS is plugged into port 14 and 20 on the switch, which are configured as a NIC team.
Things I have tried that did not help:
Configure the NAS as just a single ethernet connection, connected to an unteamed port
Upgraded firmware to 4.2.19
Downgraded firmware to 4.2.17
Disabled Jumbo frames
Different switch (HP 2810)
Different network cables
Switch firmware is up to date
If I unplug one of the teamed ethernet connections from the NAS (virtually via the switch), it comes online again for a while but will eventually drop back off again, requiring a reboot in order to see it again. The front panel works fine, and can shut down the NAS cleanly (ie no forced shutdown needed).
I took NAS back to our office and it didn't skip a beat with Shadowprotect backups. Ran the full disk and memory tests on the device, which took most of a day.
Logs on the NAS don't shed any useful information that I can see, please let me know if there is anything in particular I should look at.
I'm just about to enable Flow Control on the those 2 switch ports to see if it helps.
Thanks for your help :)
I have a customer with a Netgear ReadyNAS Pro, with 6x WD 1TB drives. The drives are on the hardware compatibility list.
We have it connected to a HP 1810 switch, with NIC teaming enabled (round robin). There is 3 (physical) HP servers that then back up to it via Shadow Protect over the LAN. 2 of those 3 servers have a 4-cable NIC team also, allowing for 4GBit of bandwidth each.
This setup has been working fine for 6-9 months or so, but all of a sudden the NAS has started failing.
About 5-60 minutes into a Shadow Protect backup, the NAS will stop responding to ping, and essentially drop off the network. Network lights still stay active on the NAS.
The switch will also log errors such as: "Excessive CRC/Alignment Errors on port 14" or "Excessive broadcasts detected on port 14" or "Excessive jabbering detected on port 20". The NAS is plugged into port 14 and 20 on the switch, which are configured as a NIC team.
Things I have tried that did not help:
Configure the NAS as just a single ethernet connection, connected to an unteamed port
Upgraded firmware to 4.2.19
Downgraded firmware to 4.2.17
Disabled Jumbo frames
Different switch (HP 2810)
Different network cables
Switch firmware is up to date
If I unplug one of the teamed ethernet connections from the NAS (virtually via the switch), it comes online again for a while but will eventually drop back off again, requiring a reboot in order to see it again. The front panel works fine, and can shut down the NAS cleanly (ie no forced shutdown needed).
I took NAS back to our office and it didn't skip a beat with Shadowprotect backups. Ran the full disk and memory tests on the device, which took most of a day.
Logs on the NAS don't shed any useful information that I can see, please let me know if there is anything in particular I should look at.
I'm just about to enable Flow Control on the those 2 switch ports to see if it helps.
Thanks for your help :)
6 Replies
Replies have been turned off for this discussion
- Shot in the dark but you may want to try enabling flow-control on the ports. I've seen a few cases with NASen plugged in to Cisco and HP switches with pretty much the same symptoms resolved with this.
Did this start happening after a certain firmware upgrade?
What type of switch was it plugged in to at your office? - Hi siigna,
Thanks for your reply :)
I've just enabled flow control on the ports, will see if that makes a difference. Unfortunately the switch and NAS don't support manually setting the duplex to 1000/FULL, so I have left it on auto.
Office is a HP 1810 also. - I'll be honest: if it works I have no clue why it does. ;)
- Still chugging along at the moment @ 50MB/sec :) 4 hours left on the backup.
Interesting article about flow control:
http://virtualthreads.blogspot.com/2006/02/beware-ethernet-flow-control.html - Looks like the flow control setting did the trick, backups have been running fine for a week now. Thanks for your help! :)
- Awesome, if you run into anything odd let me know. ;)
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