stack and lag troubleshooting

Hello ,

 I have  3 m5300's stacked together.  One of the switches is normally off  as a cold spare. Code version = 10.0.0.53 for both switches.

We use lags to connect to  4 other netgear switches +  two proxmox clusters  [ 10 nodes] and a nfs system .

Yesterday I tested  rebooting the Management Unit [1]  in order to make sure fail over worked.    It did not.   in order to work properly every lagged switch and proxmox node had to be rebooted.   Prior to that there were limited / slow connections.

 the symptoms were :

1- very slow backups to nfs.   what should have taken 10 minutes took 2 hours.

2- network sluggishness

3- un able to connect to some systems.

and more.   we use zabbix and had 60 reports of service / connection issues.

Note this thread may take awhile to get to solved as tesitng can only be done off hours -   Saturday afternoon and Sunday morning.

Here is an example of a lag we use:

lag  9 goes to a  M4100-50-POE prosafe managed switch.     firmware version 10.0.2.26

Web page:

 hashmode [ for all lags ] = 3

 Stp mode Enable

Static mode disable

Link trap disable

(GSM7352Sv2) #show running-config interface lag 9

!Current Configuration:
!
interface lag 9
auto-voip protocol-based
description 'to mezz switch'
set igmp mrouter interface
dhcp l2relay
mtu 9216
vlan pvid 8
vlan participation auto 1
vlan participation include 8,20,25,40-41,70,80,90,199
vlan tagging 20,25,40-41,70,80,90,199
exit

On the m4100:

(M4100-50-POE) #show running-config interface lag 1

!Current Configuration:
!
interface lag 1
auto-voip protocol-based
mtu 9216
vlan participation include 8,20,25,40-41,70,80,90,199
vlan tagging 8,20,25,40-41,70,80,90,199
exit

If you have a suggestion to try to solve this, or would like to see more data please respond.

best regards.