Strange network bandwidth management

Hi,
I've noticed some strange behaviour of Remote Desktop Services.
I have remote Windows Server 2012 R2 running in data center. There is 100 Mb/s download / 100 Mb/s upload internet link tested with speedtest.net. I have also two laptops with Windows 8.1 in my office running on 25 Mb/s donwload / 3 Mb/s upload link. One
of the laptops has 1280 x 800 screen resolution and the second one has 2880 x 1620 pixels.
I tested the connection speed by downloading 2 GB file from Windows Server to my laptop. File was downloaded with 25 Mb/s speed as expected. So the connection is perfectly OK.
I've configured our application as RemoteApp on Windows Server and have been testing this environment on my laptops. Some modules of our application are "rendering intensive" - they change some big portion of screen 10 times per second. And
here the problem starts.
When I test RemoteApp only on my low resolution laptop all work great. RDP protocol utilizes about 1 Mb/s of bandwidth.
When I test application on my high resolution laptop RDP protocol utilizes about 5 Mb/s of bandwidth and application presents very low frame rate (1 frame per second maybe). I don't know why this happens. I have 20 Mb/s link and only 5 Mb/s is being used
by RDP.
And magic happens...
When I start my RemoteApp on both laptops frame rate is perfect on both of them! Windows Server is uploading 14 Mb/s (1 Mb/s to low resolution laptop and 13 Mb/s to high resolution one). It streams 6 Mb/s more to high resolution laptop than in "single
laptop" scenario! When I close or even minimize (!) application on low resolution laptop the frame rate on second laptop degrades. When the application is resumed, frame rate goes up.
The same behaviour is observed when I run RemoteApp on high resolution laptop only but I connect through RDP to my Windows Server and turn on session shadowing. I observe my laptop's session through shadowing and frame rate magically goes up.
It's strange that streaming RDP sessions to two laptops produces better experience than doing it only for one client. I'm able to reproduce this behaviour every day, every time in two locations with different internet service providers.
I turned off all magic fair sharing (disk, CPU, network) on Windows Server but without any success. The same about turning off UDP connections or connecting with and without RD Gateway. I think that there is some magic algorithm for resources management
that is causing it. I've been searching internet and testing different scenarios for week but without any luck.
Have anybody seen something like this? I would be very grateful for your help.
Wojtek Małota

Hi Wojciech,
Bandwidth consumption when using RemoteApp programs could increase and decrease, depending on the application and its usage, when compared to using a remote desktop. There are lot of factors which can be taken into considerations when measuring performance
for RemoteApp\Desktop. You can go through below article for detail as also there is RDP performance whitepaper to understand clearly.
RDS: Choosing between Delivering RemoteApps versus Full Desktops
http://social.technet.microsoft.com/wiki/contents/articles/1366.rds-choosing-between-delivering-remoteapps-versus-full-desktops.aspx
Hope it helps!
Thanks.
Dharmesh Solanki
Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Support, contact [email protected]

Similar Messages

Bandwidth Management(Rate Limit) Using QoS Policies

Hello,
I need some advice. We have an ASA 5525 running version 8.6(1)2 and a 10 MG pipe. I have execs that want to limit bandwidth on users for stuff like youtube, stream media, and downloads. I found the article on ‘Bandwidth Management(Rate Limit) Using QoS Policies’ so it appears our firewall can do what we want. I’m not a cisco person. My knowledge is limited when it comes to configuration – that’s why we have SmartNet :). The advice I need is what to ask for, so to speak, when I put a case in. Can bandwidth be limited on end users and/or can they limit the ‘bandwidth rate limit’ to just youtube, steaming media, and downloads? If so, what should the limit be? and I’m assume this would be for ‘incoming’ traffic only? we’re running into some bandwidth hogs – usually youtube and/or streaming media. We have a Barracuda web filter which we’ve used to block and monitor activity but I simply do not have time to babysit this all day. I should also mention we do have critical data running up and down the pipe; such as credit card processing, DB replication between in house DB and hosted website, TPCx and EDI, FTP, and such that we don’t want restricted.
Need input please,
Thanks,
D

Hello,
That's a question that you as the network admin of that organization could answer.
How much traffic for business purposes must travel via HTTP/HTTPS?
How much bandwith are you willing to provide to this 2 protocols?
Those are the kind of answers you need to answer before setting the number
Regards
Remember to rate all of the helpful posts, Just click the 5 stars at the left of each post
Julio

Solaris Bandwidth Manager

Hi every one.
I just Installed the Solaris OS 5.10 10/08 on a new Dell Vostro 200. I downloaded the Solaris Bandwidth Manager Documentations but can't find the software itself in solaris.
Does the software come bundled in solaris 10 or does one get it separate?

I have moved this question to the Network Configuration Forum here [http://forums.sun.com/thread.jspa?threadID=5354258|http://forums.sun.com/thread.jspa?threadID=5354258]. Please follow the link.
Sorry for any inconveniences.
Regards
Nyantos.

LRT214 - Bandwidth Management Rate Control Rule

I have an LRT214 that is configured with 3 VLANs. VLAN 1 just for management, VLAN 10 for internal devices, VLAN 20 for guest devices. Everytime i try to add Bandwidth Management Rate Control Rules for my VLAN 20 IP Range, the router stops responding within 10 seconds to 5 minutes. If I remove the rules, I am able to keep the network up for days. I have even had someone from Linksys Support remotely login to my computer then the router and remove my rules, then add them just like I had. It stayed up for about 3 minutes and then I lost network connections to all devices and couldnt even login to the router. Once I power cycle the router, i am able to get into the router long enough to remove the rules and then everything functions normally. Is anyone else having issues with Rate Control Rules or are there other steps that need to be done as well?
Just as an FYI, I do have an open case with Linksys but havent heard back from them since Wednesday the 21st. I have tried configuring another LRT214 and even a LRT224, the same issue happens when I add the rules on both of those as well.

QOS does a calculation based on the up\down Maximum bandwidths. Then applies that against the rules you set. It's critical that the values be accurate.
Rate control is like pie slices. Leave enough for the rest of the network.
Please remember to Kudo those that help you.
Linksys
Communities Technical Support

Airport Extreme - Guest Network - Bandwidth Control

Hello Everyone,
I'm in need to deploy a solution to someone in a bar and I wanted to know if it's possible to do it with the Airport Extreme of Apple.
I already saw some study cases, and I not sure if it's possible to do what I pretend.
This is the cenario:
The user have in his office an ISP router with wireless that provides him with network connectivity for all his devices, in his office.
But where the clients are the signal doesn't get there, so we passed a cable to the bar, and we want to deploy there network guest access to the clients.
The thing is that we want to make the clients network to don't have access to the internal network devices, and then to controll at what velocity then can connect. Providing sometimes higher speeds, and other times lower speeds. (bandwidth management / limited).
Is it possible for me to use the Airport extreme for that? If not, do I have any other solution?
Thanks in advance.
Regards!

As stated this is not consumer level router functionality.
You either need a router that takes a third party firmware.. eg Gargoyle.. just google for it as I am not allowed to post details.
Or you need a pro wireless hotspot solution. These are expensive..$500-1000 but work without bothering the business owner.. you provide each person who buys a drink a printout ticket with username and password.. which allow both limited time and bandwidth. It is better than just making a free for all. There are also methods where people can login with credit card details.. but I think it is better to use the ticket type system.
For a cheap free for all.. as I said look at gargoyle.

Bandwidth management on 3650 configuration example

in the 3650 datasheet, he says
The 3650 switch has advanced wired plus wireless QoS capabilities. It uses the Cisco modular QoS command line interface (MQC). Theswitch manages wireless bandwidth using unprecedented hierarchical bandwidth management starting at the per-access-point level and drilling further down to per-radio, per-service set identification (SSID), and per-user levels. This helps manage and prioritize available bandwidth between various radios and various SSIDs (enterprise, guest, and so on) within each radio on a percentage basis. The switch is also capable of automatically allocating equal bandwidth among the connected users within a given SSID. This makes sure that all users within a given SSID get a fair share of the available bandwidth while being connected to the network. The UADP ASIC enables the hierarchical bandwidth management and fair sharing of bandwidth, thereby providing hardware-based QoS for optimized performance at line-rate traffic.
In addition to these capabilities, the switch is able to do class of service (CoS) or differentiated services code point (DSCP) based queuing, policing, shaping, and marking of wired plus wireless traffic. This enables users to create common policies that can be used across wired plus wireless traffic. The 3650 also supports downloadable policy names from the Cisco Identity Services Engine (ISE) when a user successfully authenticates to the network using the ISE.
We are having repeated issue of a single user taking up all the WAN bandwidth. We are trying to figure out a way to limit the user from taking up all the bandwidth My leadership see the datasheet and attended the webinar and they mention bandwidth management and think that the 3650 is the solution. From wireless, maybe, but from wired, ???
How could accomplish this goal from a wired side? or should I take a different approach?
I can discuss further if needed.

Hello,
That's a question that you as the network admin of that organization could answer.
How much traffic for business purposes must travel via HTTP/HTTPS?
How much bandwith are you willing to provide to this 2 protocols?
Those are the kind of answers you need to answer before setting the number
Regards
Remember to rate all of the helpful posts, Just click the 5 stars at the left of each post
Julio

Optimize network bandwidth usage in large multi-size corporate environments

SymptomsTo maintain a high protection level, you may notice an increase in bandwidth due to the increased number of updates released per day. Policy Manager Proxy (PMP) installations are especially affected as the additional strain on the likely slower network connection that exists between the remote site hosting the PMP installation(s) and the main corporate site with Policy Manager Server (PMS). The network bandwidth usage can be especially high when computers are turn on on Monday as the update packages accumulate over the weekend.
DiagnosisBy default, the Automatic Update Server (AUS) in PMS calculates byte-level differences for the last five update packages (per update channel). In the event where computers were turned off over the weekend, client machine has missed five updates, and PMS will then download a full update package (Aquarius Windows updates can be approximately 140MB in size). When this happens, network bandwidth usage can be excessively high.
SolutionWe recommend applying the suggested changes on all PMS and PMP systems and all of the F-Secure clients behind PMP installations. This may reduce the update size from 140MB to 10MB. The suggested solution consists of three different changes, outlined below:
1. Increase the number of byte-level difference files stored by the PMS
For Windows
To increase the number of byte-level differentials maintained by Automatic Update Server:
Open [F-Secure Installation Path]\FSAUS.PM\conf\server.cfg in Notepad.
Find the key num_old_versions_to_compare, change the value to 50, and save the file.
Restart Automatic Update Agent (AUA) and Automatic Update Server (AUS). In command prompt: net stop fsaua, net start fsaua, net stop fsms, net start fsms.
For Linux
To increase the number of byte-level differentials maintained by Automatic Update Server:
Open /etc/opt/f-secure/fsaus/conf/server.cfg.
Find the key num_old_versions_to_compare, change the value to 50, and save the file.
Restart Automatic Update Agent (AUA) and Automatic Update Server (AUS) daemons (root privileges required): #/etc/init.d/fspms restart
The overall disk space requirement for PMS increases. We estimate the disk consumption to increase by 10GB. Make sure the hard disk hosting the Policy Manager Server installation (Program files\F-Secure\Management Server 5\) has enough disk space.
2. Increase the cache size available on the PMP for storing files
For Windows
Note: Use the Advanced mode in Policy Manager Console (View >> Advanced mode) to edit the setting.
Go to F-Secure Policy Manager Proxy > Settings > Communication > Cache size.
The default setting is 500. Increase this to 5000 (5GB) and distribute new policies.
Verify the setting on all Policy Manager Proxy systems and adjust the settings, if needed. The setting specifies how much disk space is set aside for storing databases on the Policy Manager Proxy.
For Linux
As Policy Manager Proxy on Linux is not centrally managed, the change involves modifying a configuration file that exists on the Policy Manager Proxy system locally.
Open /etc/opt/f-secure/fspmp/conf/proxy.cfg.
Find the key max_cache_size, and change the value to 5000: max_cache_size=5000.
Restart the fspmp daemon (root privileges required): #/etc/init.d/fspmp restart
3. Adjust the F-Secure Anti-Virus client configuration using Policy Manager Console (PMC) to help prevent clients from immediately falling back to downloading updates directly from the PMS.
In case the client is unable to connect to the Policy Manager Proxy, for example due to high network traffic and multiple downloads taking place, the following setting dictates how soon the client attempts to connect directly to the Policy Manager Server to download updates.
In Policy Manager Console, go to F-secure Automatic Update Agent > Settings > Communications > Policy Manager Proxies > PMP Proxy fallback time.
Default value is zero which means fallback to PMS takes place immediately, in case where Policy Manager Proxy installation cannot be reached. To prevent this from happening, configure this setting to a higher value (suggest 7 hours).
These steps should ensure database updates are only downloaded via the PMP.

SymptomsTo maintain a high protection level, you may notice an increase in bandwidth due to the increased number of updates released per day. Policy Manager Proxy (PMP) installations are especially affected as the additional strain on the likely slower network connection that exists between the remote site hosting the PMP installation(s) and the main corporate site with Policy Manager Server (PMS). The network bandwidth usage can be especially high when computers are turn on on Monday as the update packages accumulate over the weekend.
DiagnosisBy default, the Automatic Update Server (AUS) in PMS calculates byte-level differences for the last five update packages (per update channel). In the event where computers were turned off over the weekend, client machine has missed five updates, and PMS will then download a full update package (Aquarius Windows updates can be approximately 140MB in size). When this happens, network bandwidth usage can be excessively high.
SolutionWe recommend applying the suggested changes on all PMS and PMP systems and all of the F-Secure clients behind PMP installations. This may reduce the update size from 140MB to 10MB. The suggested solution consists of three different changes, outlined below:
1. Increase the number of byte-level difference files stored by the PMS
For Windows
To increase the number of byte-level differentials maintained by Automatic Update Server:
Open [F-Secure Installation Path]\FSAUS.PM\conf\server.cfg in Notepad.
Find the key num_old_versions_to_compare, change the value to 50, and save the file.
Restart Automatic Update Agent (AUA) and Automatic Update Server (AUS). In command prompt: net stop fsaua, net start fsaua, net stop fsms, net start fsms.
For Linux
To increase the number of byte-level differentials maintained by Automatic Update Server:
Open /etc/opt/f-secure/fsaus/conf/server.cfg.
Find the key num_old_versions_to_compare, change the value to 50, and save the file.
Restart Automatic Update Agent (AUA) and Automatic Update Server (AUS) daemons (root privileges required): #/etc/init.d/fspms restart
The overall disk space requirement for PMS increases. We estimate the disk consumption to increase by 10GB. Make sure the hard disk hosting the Policy Manager Server installation (Program files\F-Secure\Management Server 5\) has enough disk space.
2. Increase the cache size available on the PMP for storing files
For Windows
Note: Use the Advanced mode in Policy Manager Console (View >> Advanced mode) to edit the setting.
Go to F-Secure Policy Manager Proxy > Settings > Communication > Cache size.
The default setting is 500. Increase this to 5000 (5GB) and distribute new policies.
Verify the setting on all Policy Manager Proxy systems and adjust the settings, if needed. The setting specifies how much disk space is set aside for storing databases on the Policy Manager Proxy.
For Linux
As Policy Manager Proxy on Linux is not centrally managed, the change involves modifying a configuration file that exists on the Policy Manager Proxy system locally.
Open /etc/opt/f-secure/fspmp/conf/proxy.cfg.
Find the key max_cache_size, and change the value to 5000: max_cache_size=5000.
Restart the fspmp daemon (root privileges required): #/etc/init.d/fspmp restart
3. Adjust the F-Secure Anti-Virus client configuration using Policy Manager Console (PMC) to help prevent clients from immediately falling back to downloading updates directly from the PMS.
In case the client is unable to connect to the Policy Manager Proxy, for example due to high network traffic and multiple downloads taking place, the following setting dictates how soon the client attempts to connect directly to the Policy Manager Server to download updates.
In Policy Manager Console, go to F-secure Automatic Update Agent > Settings > Communications > Policy Manager Proxies > PMP Proxy fallback time.
Default value is zero which means fallback to PMS takes place immediately, in case where Policy Manager Proxy installation cannot be reached. To prevent this from happening, configure this setting to a higher value (suggest 7 hours).
These steps should ensure database updates are only downloaded via the PMP.

ISA 550 Bandwidth Management.

I wanted to know an automated or manual method of bandwidth management for ISA 550 with 1.2.x.x firmware. I currently have 30 nodes on a 2mbps link and if one host starts downloading others are left with very little or no bandwidth at all. Is there a way I can regulate this automatically or manually?

Sounds like Ciscomax got you fixed up. Also wanted to mention, should the need arise, you can do bandwidth throttling. We do this in some circumstances on Guest Wireless networks to prevent guests from hogging to much bandwidth. So, for example, if you wanted to limit bandwidth on a GuestWiFi to 512K/128K, you would do the following.
From within the ISA500 Config Utility, select Networking on the left
Expand QoS and select General Settings
Select to Enable WAN QoS and select Save
Expand WAN QoS and select Traffic Selector (Classification)
Select Add
Class Name:                   G-WiFi (In)
Source Address:                        Any
Destination Address:      Guest_Network
Select OK
Select Add (again)
Class Name:                   G-WiFi (Out)
Source Address:                        Guest_Network
Destination Address:      Any
Select OK
Select Save
Select QoS Policy Profile under QoS, WAN QoS in the Networking section on the left
Select Add
Policy Name: G-WiFi (In)
Select the Inbound Traffic radio button
Select Add
Select G-WiFi (In) from the Class drop down menu
DSCP Marking: None
CoS Marking:     7
Rate-limiting:      512
Select OK
Select OK
Select Add (again)
Policy Name: G-WiFi (Out)
Select the Outbound Traffic radio button
Select Add
Select G-WiFi (Out) from the Class drop down menu
Queue:               Q1
DSCP Marking: None
Rate-limiting:      128
Select OK
Select OK
Select Save

Bandwidth managment

This is a pre-sales question I am running a small satellite internet network of 20 users. I would like to know if there is a bandwidth management feature on the TC. We have a daily usage allowance on our system and I would like to track usage by IP address. Also does the TC support static IP addresses by mac address? If so up to how many users? Our current router only allows eight.
Thanks,
Jerry

There is no "bandwidth management" feature built into the Time Capsule.
Time Capsule does support IP address reservation on the basis of client MAC address. I am not aware of any hard limit on the number of reservations that can be made.

Cry for help: a decent network profile manager

Am I the only one that finds the default arch linux network profile management a bit.. lacking? Maybe I just don't have it set up right, but it only works for my ethernet connection and connecting to non-encrypted wireless networks. Problem is, I run WPA2-AES networks at home and at work. I finally got wpa_supplicant properly set up (I'm on wireless right now), but I can't just select the network profile from the menu and be on my way.
Here is what I have to do to get connected right now:
[root@cdl-magnesium chris]# wpa_supplicant -dw -c/etc/wpa_supplicant.conf -Dmadwifi -iath0
[root@cdl-magnesium chris]# dhcpcd ath0
and I'm connected, everything working great. That's fairly simple, right? I'm thinking my network profile has a lot more in it than necessary.
# Network Profile
DESCRIPTION="57 May"
# Network Settings
INTERFACE=ath0
#HOSTNAME=myhost
# Interface Settings (use IFOPTS="dhcp" for DHCP)
IFOPTS="dhcp"
#GATEWAY=192.168.0.1
# DNS Settings (optional)
#DOMAIN=localdomain
#DNS1=192.168.0.1
#DNS2=
# Wireless Settings (optional)
ESSID="Galactica"
#KEY=
#IWOPTS="mode managed essid $ESSID channel 6 key restricted $KEY"
WIFI_INTERFACE=wifi0 # use this if you have a special wireless interface
# that is linked to the real $INTERFACE
WIFI_WAIT=5 # seconds to wait for the wireless card to
# associate before bringing the interface up
USEWPA="yes" # start wpa_supplicant with the profile
WPAOPTS="-D madwifi" # use "" for normal operation or specify additional
# options (eg, "-D ipw")
# see /etc/wpa_supplicant.conf for configuration
#AUTOWPA="yes" # automatically configure WPA
If I do a /etc/rc.d/network restart and select the profile from the menu, I get all sorts of errors about not being able to connect to wpa_supplicant (because for some reason it isn't running.. was I supposed to do something about that?).
I'm a bit tired right now so pardon any incomprehensible sentences or questions
ps: while we're on the subject, is there a way to re-sort the items in the network profile list? It always wants to connect to this broken wpa2 profile first, as I think it just goes in alphabetic order or somethin. I guess I should just turn off the timeout so it always waits for me to choose.

i'm working on one.
http://wiki.archlinux.org/index.php/Network_Scripts
James

Strange network prob setting up WRK54G

Hi,
I have spent an afternoon setting up a WRK54G (not WRT) router and have come across a very strange networking problem. I am using the router to setup a small network in the office off one of the LAN points. I connected the router up and set it up with a static IP address and gateway for the company LAN so setup looked like (Office LAN socket - WRK54G - PC). Once done the internet connectivity using a pc connected to the router via cable was very slow . I replaced the router with a switch (simple 4 port netgear switch) just to get through the day and set my PC back up to the static IP. Later that day I tried to set up the router again and forgot to remove the switch so the setup was (Office LAN socket - switch - WRK54G - PC). To my surprise the whole thing worked. When cleaning up the cables I noticed the switch was still in the chain so I removed it and the same problem of slow speed and packet loss came back.
Any ideas????
Can the WRK54G only take an internet connection from cable or DSL modem? Should there be a problem due to it connecting to a o a LAN?

I have similar settings as yours and it works fine for me.
I guess the dns or gateway is creating porblem for you. I have hardware firewall installed in our company so the lan ip of the firewall becomes geteway for me. so if I set up static ip for the router and give the gateway as the lan ip of the firewall plus the DNS of the ISP it works great.

Disable "Estimated network bandwidth on one of the connections" check

I have several Windows clients that hang at applying computer settings when starting up. All computers that show this behavior have 2 network adapters. One is the physical adapter another is a virtual adapter created by 3rd party software. Virtual Network
adapter always stays enabled (even if you disable it, it comes right back to the enabled state) and has an APIPA address assigned to it. The OS sees the adapter in connected state and attempts to estimate the network bandwidth on that connection,
but since no traffic is being passed through on this link it's forced to wait for the time out, which causes the delay. So the question is, how do you exclude a specific network adapter from being checked for bandwidth at the OS start
up?
Thanks

Hi,
>>One is the physical adapter another is a virtual adapter created by 3rd party software. Virtual Network adapter always stays enabled (even if you disable it, it comes right back to the enabled state
Based on the description, it's recommended that we contact the vendor support of the software to see if they can help disable the virtual adapter or provide some suggestions regarding the situation.
Best regards,
Frank Shen
Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Subscriber Support, contact [email protected]

Operation timed out (FSP network services manager)

Received this error from five different RMAN jobs, all submitted at approx 6am, all failing within a couple of minutes. Resubmit of all five jobs worked fine. Many other jobs submitted at approx the same time worked fine. Time out does not appear to be related to waiting on tape drive resources.
Any ideas as to cause? If this is a network thing, any way to extend the timeout or cause it to retry?
Regards,
Rich McClain
ORA-19506: failed to create sequential file, name="SBT_TAPE/RMAN_SCMP.707724115.arch.1.7372.1", parms=""
ORA-27028: skgfqcre: sbtbackup returned error
ORA-19511: Error received from media manager layer, error text:
sbt__rpc_cat_query: Query for piece SBT_TAPE/RMAN_SCMP.707724115.arch.1.7372.1 failed.
(Oracle Secure Backup error: 'operation timed out (FSP network services manager)').
Snippet from obroxyd.log
2010/01/08.06:02:57 [2543] failed to connect to admin scheduler - operation timed out (FSP network services manager)
2010/01/08.06:03:02 [2543] client disconnect from IPC connection 4 (closing)
2010/01/08.06:03:03 [2543] obproxyd is terminating now
2010/01/08.06:03:11 [9770] failed to connect to admin scheduler - operation timed out (FSP network services manager)
2010/01/08.06:03:16 [9770] client disconnect from IPC connection 4 (closing)
2010/01/08.06:03:16 [9770] obproxyd is terminating now

Either reconfigure CONNECT_TIMEOUT to be 0, which means wait indefinitely, or reconfigure CONNECT_TIMEOUT to be some higher value. Or, if the timeout is unacceptably long, turn on tracing for further information.
If you have oracle metalink, then read the following note;
Note:119706.1 - Troubleshooting Guide TNS-12535 & ORA-12535 Errors

How to calculate network bandwidth for dataguard 11.2

Hi all,
have a customer who needs to setup a new data guard environment in release 11.2.0.2. Primary site will be in Italy, standby site will be in New York.
He would like to know the network bandwidth between primary and standby site needed to obtain the maximum performance in redo transport with or without compression option.
I found a lot of threads and docs indicating some formulas but none of them explained how to:
- calculate network bandwidth on a rac system (having a single instance standby database)
- calculate network bandwidth in case of use redo transport compression
- calculate cpu consumption if using redo transport compression
Could you please give any advice?
A.M.

Hi,
customer made ma a lot of technical question just like the following:
- which are the main factors determining the 30% overhead indicated in the network bandwidth calculation
Required bandwidth = ((Redo rate bytes per sec. / 0.7) * 8) / 1,000,000 = bandwidth in Mbps
- how much bandwidth will I gain if I apply redo transport compression and why redo transport compression and why usually the gzip utility gives me 5X less and oracle compression gives me a maximum of 50-60% of compression even if it uses the same engine of zlib compression as indicated below?
Data Guard redo transport compression uses the same zlib compression engine at level 1 as gzip -1. To estimate the compression ratio you can achieve using Data Guard redo transport compression, first compress an archived redo log file with gzip:
$ gzip -1 <archive redo logfile>.arc
Then use the gzip --list option to explicitly display the compression ratio:
$ gzip --list <archive redo logfile.arc>.gz
Note: Use gzip version 1.3.3 or later. Refer to www.gzip.org for the latest information on gzip.
Could anyone give me any direction?
Thank you
AM

Bandwidth manager with Solaris

Hi all !
Is there a tool for bandwidth manager like pf-altq in BSDs or other in Linux ?
Thanks in advance.
roberto

Download and install:
ntop:
http://www.ntop.org/
iftop:
http://www.ex-parrot.com/~pdw/iftop/
Gary

Strange network bandwidth management

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