Cable Forum - View Single Post - Preston UBR4

Chrysalis · 29-07-2010, 10:14

VM have a strange (but I guess not to accountants) upgrade policy where it seems a UBR needs to be flatlining for a upgrade to be approved.

When someone like tech support check the ubr load I think they are looking at a graph that plots 5 minute or 2 hour averages. The problem with these graphs they are averages and can hide full utilisation. on one of my servers where I also plot 5 minute averages I see peak average utilisation at about 70% which at first glance would seem ok. But when I check the live traffic utilisation it is bouncing of its throttle limit (10 mbit) every 10 seconds or so. If 80% it would obviously be more frequent, same at 90% and so on yet at those utilisations it would appear to have no congestion to the untrained eye. I dont know what VM's policy is but the consistent thing I read on the official VM forums is refused upgrades due to traffic levels not staying high for a consistent time so it appears they wait for very severe congestion. This is why I have said in the past once an area is congested it is probably doomed on VM as their own policies mean they would never get on top of it because I guess by the time an upgrade is done another one is already needed but wont be approved.

29-07-2010, 10:14	#3
Chrysalis VMNG300 FTW!!!! Join Date: Sep 2003 Location: Leics Age: 33 Services: M TV 30mbit BB (new uplifted bottom tier) - VMNG300 Basic Phone Posts: 10,376	Re: Preston UBR4 - Still oversubscribed VM have a strange (but I guess not to accountants) upgrade policy where it seems a UBR needs to be flatlining for a upgrade to be approved. When someone like tech support check the ubr load I think they are looking at a graph that plots 5 minute or 2 hour averages. The problem with these graphs they are averages and can hide full utilisation. on one of my servers where I also plot 5 minute averages I see peak average utilisation at about 70% which at first glance would seem ok. But when I check the live traffic utilisation it is bouncing of its throttle limit (10 mbit) every 10 seconds or so. If 80% it would obviously be more frequent, same at 90% and so on yet at those utilisations it would appear to have no congestion to the untrained eye. I dont know what VM's policy is but the consistent thing I read on the official VM forums is refused upgrades due to traffic levels not staying high for a consistent time so it appears they wait for very severe congestion. This is why I have said in the past once an area is congested it is probably doomed on VM as their own policies mean they would never get on top of it because I guess by the time an upgrade is done another one is already needed but wont be approved.