Network Throughput issue

Deektribe · 08-24-2009, 09:28 PM

Hi all,
I am new here, so I am not sure what level of support is offered...but I am a seasoned tech with 20 years experience...I can probably help with about any problem...But now I have a problem of my own that I am not sure where to start....but here goes

I have four class C subnets on 3 T-1's coming in to a Cisco 4500 router - the problem is backup throughput...I am running BUE 11d to "backup to disk" the enitire network. Backing up machine on subnet A (the same subnet as the backup server) I get about 3000mb/min....on subnets B,C, and D (different subnets to the backup server) I can only get 25mb/min, which is not fast at all and my backups on those subnets take FOREVER!

Any ideas? Starting point? Shot in the dark? I am stumped any resonable advice would be greatly appreciated!

Thanks in advance, Derek

Suncoast · 08-25-2009, 11:02 AM

Are Subnets B,C,D on the T's? Each T is 1.54mbps. (Some framing types will get you 2.04mbps.) So 1.54*60/8=11.55 Megabytes per minute per T. With overhead, closer to 10 Megabytes per minute per T. Three T's would have a throughput of about 30 Megabytes per minute.

Deektribe · 08-25-2009, 01:31 PM

Sorry, I should have been more clear...the four subnets are all local net @ 100mbps fd

I just listed the router because I suspect it has something to do with it??

Suncoast · 08-25-2009, 02:04 PM

Oh, that is an obsolete model. Yes, I would think that model, with a 100mhz processor might be having trouble keeping up. I could not find a lot of information on it. Looks like they only suggest a single fast ethernet npm. You should be able to look at your interface stats and see what it's loads are running. Reliability, txload, rxload stats., and see if your queues are maxing out.

08-24-2009, 09:28 PM	#1 (permalink)
Deektribe Registered User Join Date: Aug 2009 Posts: 2 OS: XP Pro SP3	Network Throughput issue Hi all, I am new here, so I am not sure what level of support is offered...but I am a seasoned tech with 20 years experience...I can probably help with about any problem...But now I have a problem of my own that I am not sure where to start....but here goes I have four class C subnets on 3 T-1's coming in to a Cisco 4500 router - the problem is backup throughput...I am running BUE 11d to "backup to disk" the enitire network. Backing up machine on subnet A (the same subnet as the backup server) I get about 3000mb/min....on subnets B,C, and D (different subnets to the backup server) I can only get 25mb/min, which is not fast at all and my backups on those subnets take FOREVER! Any ideas? Starting point? Shot in the dark? I am stumped any resonable advice would be greatly appreciated! Thanks in advance, Derek

08-25-2009, 11:02 AM	#2 (permalink)
Suncoast Registered User Join Date: Jul 2009 Location: Largo, FL, USA Posts: 389 OS: XPP, Linux, 2003, Cisco	Re: Network Throughput issue Are Subnets B,C,D on the T's? Each T is 1.54mbps. (Some framing types will get you 2.04mbps.) So 1.5460/8=11.55 Megabytes per minute per T. With overhead, closer to 10 Megabytes per minute per T. Three T's would have a throughput of about 30 Megabytes per minute. Last edited by Suncoast; 08-25-2009 at 11:06 AM.*

08-25-2009, 01:31 PM	#3 (permalink)
Deektribe Registered User Join Date: Aug 2009 Posts: 2 OS: XP Pro SP3	Re: Network Throughput issue Sorry, I should have been more clear...the four subnets are all local net @ 100mbps fd I just listed the router because I suspect it has something to do with it??

08-25-2009, 02:04 PM	#4 (permalink)
Suncoast Registered User Join Date: Jul 2009 Location: Largo, FL, USA Posts: 389 OS: XPP, Linux, 2003, Cisco	Re: Network Throughput issue Oh, that is an obsolete model. Yes, I would think that model, with a 100mhz processor might be having trouble keeping up. I could not find a lot of information on it. Looks like they only suggest a single fast ethernet npm. You should be able to look at your interface stats and see what it's loads are running. Reliability, txload, rxload stats., and see if your queues are maxing out.