Network Architecture Question for ya...

At home we have quite the network. 12 active wireless IP's and 4 ethernet.
So, here's the question, in two parts:
1) Is it true that, say you have 10 wireless devices connected to a wireless .11n router, 9 of them .11n and 1 of them .11g, and the whole network bogs down to the .11g speed? and;
2) Why is my danged network so slow reaching he internet??? Using Speakeasy I usually only get 7Mbs to my MBP from the internet.
Yes, there's a lot going on in my network, but I can isolate everything (by physically turning everything off) and I still only get 7Mbs wirelessly to my MBP. I can connect my MBP directly to my cable modem (without rebooting or resetting the modem) and always get my advertised 25Mbs using the same Speakeasy test. However, I run a Time Capsule, in .11n only (2.4Ghz), off that cable modem. On the other end of the house, I extend my network using an AE whose ethernet port is connected to the WAN input of a D-Link wireless router in the .11g only mode. Both g and n are supposed to operate well above 25Mbs, so what's the deal?
Any ideas??
~brent

Oh... and I have and Apple TV on the "N" network.

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Edited by: 905243 on Aug 23, 2012 1:27 PM

Hi,
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Bye,
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Message Edited by sunflower2772 on 02-05-2010 03:10 AM

I'm no expert on these matters but I'm fairly certain that for 1 to 4 you have concluded correctly.
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The modem itself will simply forward any incoming connection to your computer, independant of its dynamic internal IP address, provided your network rules in the modem are configured for that correctly.
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

Wireless and network printing transcript for Meet the Experts

On March 16th, HP hosted its first online chat event on wireless and network printing. Below is a transcript of that session.
I am in the process of planning the next chat event. I would love to hear what topics would interest you, what day of the week and time is best for you, and if you think an hour is too long.
So, if you get a minute, please let me know.
Here's the transcript:
SiobhanF-HP: Welcome! Cameron, Craig, David, and Jim are ready to tackle your questions.
SiobhanF-HP: Just to remind you if you want to ask a question, you must be a member of the HP Support Forums. If you want to join, go here https://passport2.hp.com/hppcf/createuser.do
nc256: Do I need a wireless router to hook up my wireless printer?
CameronL-HP: No, but most people will want to do it this way. You can use a feature called an ad hoc connection to avoid using a router, but it is only covered under an older standard that is slower and less secure. Also, without something to route traffic between the local network and the internet, you cannot get an internet connection. Using a wireless router makes setting up a wireless network easier, and it will generally make the network work better too.
jest1: I've seen some hardware in stores for a "print server" hardware device that attaches to a network. Is this something that I need in order to run a printer over a network?
CraigB--HP: Not if you have a printer that has a network connection built in. Many models of HP computers are ready to be connected directly to your wired or wireless network.
katiepage: How can I print when I am using a VPN?
DavidH-HP: VPN connections generally hide the rest of your home network to increase the security of the VPN connection. A printer on the network isn’t a security threat but the VPN doesn’t know that. It just hides everything just to be sure. That means that when a VPN is active you need some way to connect to the printer other than your home network. Bluetooth, USB, and even printing to a thumb drive and plugging that into the printer are all ways of getting your print job to the printer that don’t go through your home network.
SiobhanF-HP: If you have specific product questions, the more information you give us the better we will be able to help you. Getting your exact model number; any error messages; a description of your wireless network including what kind of security you have, what wireless-devices are connected to your network, and your IP address will go a long way to helping us answer your question.
MelissaP: Why would I want a wireless printer?
CraigB--HP: The main advantage of a wireless printer is the ability to place the printer somewhere in your home or office even if this is not near your router or computer.
Deltan: What is the maximum distance I can have between my router and my printer?
CameronL-HP: It does depend on your environment. Without interference about 25 feet. Walls and floors and other objects can reduce this. The types of walls are important. For example, mirrors and outdoor walls will greatly reduce the indoor range.
jest1: Is there a preferred wireless router type or brand for wireless printing compatibility? We are using a Linksys 802.11g router in my home.
JimB-HP: In general, any wireless-router from a name brand manufacturer that has been Wi-Fi certified is compatible with our printers (look for the Wi-Fi logo). We use Linksys in our lab with great success.
nc256: Are there any digital cameras that can send directly to an HP wireless printer for photo printing?
DavidH-HP: Many printers support a feature called Pictbridge. If the camera and printer both supports this feature, the camera can be plugged directly into the printer to print photos. Or are you asking about printing over a network connection?
KevinW: I keep hearing that you shouldn’t use default settings for a network. Why?
CraigB--HP: There are three reasons not use default settings: First, wireless-routers do not have any wireless security enabled by default. Second, you will be using a common network name in which case you may connect accidentally to your neighbor’s network. Third, your wireless-router is accessible by inadvertent guests who may change the configuration of your wireless-router without your knowledge or use your internet connection without your permission.
Bodie08: I have an HP Lan attached printer and Windows XP on my home network. Is there a known setting (Firewall/port/other) or patch to address the issue of hpqtra08.exe hanging on Windows XP Shutdown? A number of us in the forum have identified this issue. Thanks!
DavidH-HP: This problem has been seen in the past but there were attempts to address it. Have you checked to see if there is a later release of software available on the web? (hp.com)
ZhuLee3: How old is wireless printing technology? I noticed all the experts have around 20 years of experience with it, was there wireless 20 years ago?
JimB-HP: Wireless printing first appeared with the introduction of the 802.11 standard in late 1990's. HP has been making wireless printers since 2003.
lpeterson123: What makes wireless so flaky at times?
CameronL-HP: There are lots of reasons. Wireless signals are affected by distance, walls, metal objects, and other wireless devices like cordless phones. However, most of the problems seem to be from how the network or how security software is configured, and these can also cause things to fail only occasionally or in certain situations. Having a good wireless connection between a PC and printer involves several hardware devices and lots of software made by different companies that all have to work together; if something is not quite right in any of these things then the whole solution looks flaky.
Bowman16: I use a Mac, are there any features that would not work if I was to set it up for wireless use
DavidH-HP: All the features will work on a Mac if you install the full HP software solution.
jest1: Thanks for the answer on the router question. The next question, then, is to ask what would be a recommended consumer-grade wireless-enabled printer (or series) just so I can start my research.
JimB-HP: Any of our Photosmart or Officejet wireless printers will work with Wi-Fi certified wireless-routers. Our price points really have more to do with how much printing you do. In general, our more expensive printers cost less per page than our less expensive models.
Bodie08: Why would I choose "spooling" on my PC over "direct connect”?
CraigB--HP: In general, spooling allows you to use your program sooner than printing directly.
ZhuLee3: Jim: What is it like to be an "HP Printing Expert"? What kind of stuff do you get to work on, on a day to day basis?
JimB-HP: I really like my job -- I've always been a radio enthusiast so working on 802.11 technology is really a dream job for me. I'm also fortunate to work with a great team here in Vancouver, WA. More importantly, I like designing equipment that people use in their everyday lives.
TEACHER1: Recently I changed routers, now I am unable to print wirelessly, even though the SES and wireless network light are steady on my Deskjet 6980 printer. What is the solution? Thanks.
DavidH-HP: The wireless light indicates that the radio is on but does not indicate that the printer is connected to the network. First check that the printer is connected to the network by printing a network configuration page from the printer.
AgentRed: I get my internet with a Verizon wireless broadband card. Someone told me that wouldn't work with a wireless printer. Is that true?
CameronL-HP: Our wireless printers use the 802.11 b, g or n standard which is not compatible with the wireless cellular standard. It would be like trying to connect to a wireless network using Bluetooth. They are different wireless technologies.
DavidH-HP: Regarding the Verizon card, it is true that you cannot connect the printer over the Verizon connection, but as long as your laptop has Wife you can print to the printer over WiFi at the same time that the Verizon connection is active. This should not be a problem.
jest1: Is there a "minimum" internet connection that is recommended for wireless printing? We live a bit far from the DSL CO so our connection is sometimes flaky. I would guess that incoming speed shouldn't affect my local wireless LAN but I want to ask it anyway
CameronL-HP: There are 2 parts to your home network. 1 is your wireless router which manages your local network equipment, then your network connection to the world wide web which your DSL provider gives you. The connection speed of your local network is not affected by your internet connection speed.
Bowman16: Are any HP printers 802.11n? I do not want to add an 802.11b,g to my network and cause it to slow down.
JimB-HP: Currently, our printers comply with the 802.11g standard. We are investigation the emerging 802.11n standard.
ZhuLee3: Will there be a transcript of all the questions and answers from this chat available for viewing after the session? I think I missed some questions at the start.
SiobhanF-HP: The chat event begins when you joined. Sorry that you can't see what was said before you joined. I hope to have transcript posted tomorrow or on Wednesday at the latest.
nc256: Where is the future of printers headed? Does HP have any interesting plans with printing technology? And what’s your opinion on whether or not color laser printing will ever approachthe photo realism of ink jet color?
JimB-HP: The future of HP printing will be characterized by wireless connectivity to not only computers but to mobile internet devices. In fact, as mobile devices become smaller (think phone or netbooks), the need to print from your mobile device might become more relevant.
jest1: Am I able to print from my iphone to a wireless printer?
CraigB--HP: You can print photos from your iPhone to HP wireless printers and it works great in my experience. Go to http://www.hp.com/go/iprintphoto to get the details.
TEACHER1: Thank you. I printed a page. It shows that wireless is disconnected.
DavidH-HP: Then you just need to input the wireless settings from your new router into the printer. If your printer does not let you input the settings from the front panel, you can use the CD that came with the printer or downloaded from hp.com to configure the printer again ( look for the option to "add a device" ).
ZhuLee3: Question about security... if I get a wireless printer, what’s to prevent other people within range of my printer, from adding it and printing documents? How is this configured on the actual printer?
JimB-HP: The simplest way to secure your printer is to enable WPA-PSK security for your wireless network and to use a security pass-phrase that is at least 12 characters long. This configuration is very safe from intruders for the foreseeable future.
CameronL-HP: It' is also a good idea to use a unique network name, also called an SSID.
carolj: I have a photosmart C7180 and I have it hooked up to my laptop (windows vista) when the setup completed the printer was put in networking instead of printers and I cannot access it or move it out of there. What do you suggest?
CraigB--HP: You might need to uninstall and reinstall. Before doing this, make sure your get the latest driver from the HP support at: http://h10025.www1.hp.com/ewfrf/wc/softwareCategory?product=1153754&lc=en&cc=us&dlc=en&lang=en&cc=us This is also where you can get a copy of the instruction book.
wizll: Hi, I haven't done much research in wireless printing, but I'm interested as I currently have my printer set up the old fashioned way where it's connected to a networked PC, but if the PC is off I can no longer print, which is obviously inconvenient. Do hp wireless printers have a web gui you can connect to once it's on the home network, or is it simply all done from the printer's interface. I've seen some old wired network printers that only use the printer's ui and that seems like a clunky use.
DavidH-HP: Yes, the HP printers which have networking built-in have what we call an "embedded" web server which allow you to configure settings, check status, and have many other features; on some models you can even scan using the embedded web server.
nc256: Jim: Will color laser printing ever reach ink jet quality for photos?
JimB-HP: While never is a long time, inkjet printers will, for the near future, output higher quality photos.
katiepage: If I'm at home, connected to my office network via VPN, can I access my office networked printers?
CraigB--HP: Yes, when you are connected to the office VPN, you can print to your office printers. However, you will not be able to print to your home networked printers while you are connected to the VPN.
jest1: If a friend comes over to my house with their laptop and needs to print something, are they able to do this just by authenticating with my wireless LAN (assuming I have a wireless printer set up)?
CraigB--HP: In addition to authenticating to your network, you friend will also need to install the printer driver for your printer.
jpszambelan: Is there a wireless USB device of some kind I can connect to my printer if there is no network connection already built in?
JimB-HP: HP sells an accessory that adds Wi-Fi capability to your USB printer (see http://www.shopping.hp.com/product/printer/inkjet/wireless/4/accessories/Q6236A%2523A2L) Also, many higher-end wireless-routers allows USB printers to be connected to them to allow sharing of the printer from the network. Note that this solution often limits you to just printing and not scanning from the network.
rockwoodchev: It seems that my computer can find my printer, but my printer can't find the computer, so that "Scan to computer" won't work. What do I need to do in order to fix that?
DavidH-HP: This can be blocked by security software running on the PC (such as a personal firewall). Make sure that your firewall is configured to allow communication on your local network. You can also unblock specific ports, but the easiest way is often just to allow communication on the local home network. The specific setting varies from firewall to firewall.
SiobhanF-HP: We are nearing the end of our chat session. We only have time for 3 more questions. If we did not get to your question, please post it on the Networking and Wireless board in the Printers and All-in-Ones forum. http://h30434.www3.hp.com/psg/board?board.id=Networking
SSPatrick: Is it possible to print wirelessly to the same HP printer using both a PC and a Mac?
JimB-HP: Yes -- I do this in my home. I have both Macs and PCs on my network without any trouble.
Bowman16: Any plans to do this again?
SiobhanF-HP: Yes we are.
ZhuLee3: Do all of the experts hang out on the HP community? Will we see you posting there after this?
DavidH-HP: Oh yes, whenever time permits. In addition to trying to help people, I learn things too.
JimB-HP: I'm known as Wi-Fi-Guy on the support forums. I hang out there often helping where I can. It helps me be a better designer.
CraigB--HP: I monitor the forums looking for problems to take back to the development lab for investigation. To date, I have only posted one reply.
CameronL-HP: I haven't been involved in the past but expect to be more involved in the future.
SiobhanF-HP: We only have time for one more question. If we did not get to your question, please post it on the Networking and Wireless board in the Printers and All-in-Ones forum. http://h30434.www3.hp.com/psg/board?board.id=Networking
ZhuLee3: Thanks for setting this up!
SiobhanF-HP: The transcript will be posted on http://h30434.www3.hp.com/psg/board?board.id=Networking
TEACHER1: Thank you all for conducting this session !!!!
jest1: Is there an OS limitation to print wirelessly?
JimB-HP: All the OS versions supported by the printer as supported wirelessly. In general, we are compatible with Macs, Windows and Linux.
SiobhanF-HP: We are ending the chat event. Thank you for coming. We hope you found it worthwhile. I will be posting a transcript of the event in the Networking and Wireless board in the Printers and All-in-Ones forum. We will be hosting future Meet the Experts chat sessions on a variety of topics, so please tell us what you thought of the event and how it could be improved. http://h30434.www3.hp.com/psg/board/message?board.id=Feedback&thread.id=525
Live Forum Closed
Message Edited by timhsu on 03-18-2009 05:39 PM
Message Edited by timhsu on 03-18-2009 05:43 PM
I work for HP, supporting the HP Experts who volunteer their time and technical knowledge to help others.

I expected this to be released quite earlier. But now that it's in process, I'll wait patiently.
Make it easier for other people to find solutions, by marking my answer with \'Accept as Solution\' if it solves your problem.
Click on the BLUE KUDOS button on the left to say "Thanks"
I am an ex-HP Employee.

Please read my question carefully, this is, I think, a question for the experts. It's not the usual name change question. When I setup my new MacBook Pro, something slipped by me and my computer was named First-Lasts-MacBook-Pro (using my real first and

Please read my question carefully, this is, I think, a question for the experts. It's not the usual name change question.
When I setup my new MacBook Pro, something slipped by me and my computer was named First-Lasts-MacBook-Pro (using my real first and last name).
I changed the computer name in Preferences/Sharing to a new name and Preferences/Accounts to just be Mike. I can right click on my account name, choose advanced, and see that everything looks right.
However, If I do a scan of my network with my iPhone using the free version of IP Scanner, it lists my computer as First-Lasts-MacBook-Pro! And it lists the user as First-Last.
So even though another Mac just sees my new computer name, and my home folder is Mike, somewhere in the system the original setup with my full name is still stored. And it's available on a network scan. So my full name might show up at a coffee shop.
Can I fully change the name without doing a complete re-install of Lion and all my apps?

One thought... you said the iPhone displayed your computer's old name? I think that you must have used the iPhone with this computer before you changed the name. So no one else's iPhone should display your full name unless that iPhone had previously connected to your Mac. For example, I did this exact same change, and I use the Keynote Remote app to connect with my MacBook Pro. It would no longer link with my MacBook Pro under the old name, and I found that I had to unlink and then create a new link under the new name. So the answer to your question is, there is nothing you need to do on the Mac, but rather the phone, and no other phone will display your full name.

How can I add or change the Network I'D for the TouchPad?

Most devices on a network have names for the device for one reason or another. This helps to distinguish between connected devices and the legitimacy thereof.
So far I have been unable to add a Network ID to this TouchPad.
With the Amazon Kindle Fire had seen the network ID as "My Phone" which I really wanted to change, and fast. Did manage to change it with an Android app called Fing, which allowed me to use a rather unorthodox network identification name.
Would like to find another network utility that can do the same for the HP TouchPad. Any ideas as to a utility, or a more manual method? Fing via the Kindle Fire shows no network ID for my TouchPad.
Post relates to: HP TouchPad (WiFi)
This question was solved.
View Solution.

Hello Xelkos,
What you're talking about is actually a feature of DHCP. When asking for an IP address, a client can send a hostname to the server so that it can be easily identified in a human-readable way.
By default, this is disabled on the TouchPad. To enable it, you're going to need to edit a text file on the device. There's lots of different ways to do this, so pick your favorite and then follow these insturctions.
Find /etc/dhclient.conf and open it
Find the line that starts with:
# send-hostname
Delete the "#" sign in front of the line and change the text inside the quotes. This text should be whatever you want your hostname to be:
send-hostname "TouchPad"
Once you've done that, save and close the file
Next, turn Wi-Fi off and then back on. You should now see your hostname show up on your Access Point / Router.
NOTE: Remember that in order to make these changes permanent, you must set the file system as read-write:
mount -o remount,rw /
You must also set it back to read-only when you're done:
mount -o remount,ro /

Got a question for all you peeps dos anyone know about i phones i have a i phone 3gs which i got unlocked i did a master reset or summin and just had a pic of apple so i plugged it in i tunes downloaded and it now says no service at the top of phone and i

got a question for all you peeps
dos anyone know about i phones i have a i phone 3gs which i got unlocked i did a master reset or summin and just had a pic of apple so i plugged it in i tunes downloaded and it now says no service at the top of phone and i tunes says invalid sim i put the correct sim in it used to be locked too and still says same pls any one with ideas?

hi sorry what happoned is that ages ago i brought a i phone 3gs on 02 network i went to a sml phone shop and payed for them to unlock it. it has been fine till yesterday when i went to reset it from the phone it then turned off and came back on just just an image of a apple for about an hour so i connected to i tunes and it said downloading software after another hr it had finished but then i tunes said in had to insert a sim so i had to un plug the phone from laptop while i did this i put my orange sim in and the i phone said where do i live and had to connect to a internet connection but all the time saying no service where the signal bar is and then says activating i phone it took a few min and said couldnt finish it bec of the signal and to connect it to i tunes to do it so i connected it to itunes and i tunes just keeps saying invalid sim so i took my orange sim out and put a 02 sim in and is still saying invalid sim on itunes?

'Genius' related question for anyone with over 1.2TB of music?

Anyone out there with a iTunes library with over 1.2TB of music?
Reason I ask, is that I've not been able to solve a problem in updating Genuis - I'm getting the error - 'Genius results can't be updated right now. There is not enough memory available ~ Please try again later.' or the 'unknown 4002 error'. The steps I've taken to try and correct sometime back can be found in https://discussions.apple.com/message/12584815#12584815 and also shown here in sequence below.
I keep thinking this will be fixed with the next version iTunes but so far with the latest, things still the same. So looking to see if anyone with a similar size library is having similar problems and it just a limitation of the program or it's something specific on my end that I can fix.
Appreciate...
Up to this weekend I've had not issues with Genius. Worked beautifully and updated last Sunday as I have been doing every week since Apple added Genius. Yesterday I added a few albums and went to update and now getting the error of 'Genius results can't be updated right now. There is not enough memory available ~ Please try again later.' Now my library is well over >200,000 songs and only added 6 albums this time. Music sits on a external 2TB drive ~100GB free and my MacBook Pro has over 60GB open. Running latest Mac OSX and latest iTunes. Nothing new installed or changed since last Genius update.
To the points raised in this thread.
1. I've been updated weekly with a Library with over 200K songs till now with no problem. Majority is what I've ripped from my albums & CDs.
2. Deleted the albums recently added since last successful update - same result.
3. Connected directly to the network bypassing router as suggested here - same result.
4. Reinstalled iTunes program - same result.
5. Repaired permissions - same result.
Problem remains. Welcome any additional thoughts.
Question for anyone with a music library
https://discussions.apple.com/message/12584815#12584815
Ok, tried all the suggestions here yet the problem remains.
In addition what I posted above -
1) Dumped the cookies in user/library/cookies folder
2) Deleted the apple cookies found under Safari Preferences "Show Cookies"
3) Repaired disk permissions
4) Deleted iTunes Library Genius.itdb file
5) Reinstalled iTunes (with the new 10.1 version)
6) Restarted computer
7) Rebuilt iTunes Library folder http://support.apple.com/kb/ht1451
8) Deleted all iTunes dead tracks
http://dougscripts.com/itunes/scripts/ss.php?sp=removedeadsuper
9) Increased internet access speed
10) Removed all open "[" and '}' brackets from songs, albums & artists
10) Rebuilt my entire library from scratch!
Is there anyone out there with over 200K songs that can update their Genius? One thing I noted is the genuis.itdb file is just over 2GB. I'm wondering if there is a maximum size on this based on the error I'm getting. Any thought or know info on this?
Ok, think I may have found something here with this. I backed out all the music added prior to this problem occurring and ran the Genius update. All worked fine. I then started adding the music back little by little (running the update each time) until the problem returned. When the problem came back I ruled out the specific music added by backing that bit out, verified all was ok and added a different batch back in.
Bottom-line it appears that when my library exceeds exactly 1.208TB the problem appears. Interestingly enough it does not appear to be related to the number of songs, the size of the genius.itdb file (in fact when it was working the file was at 2.25GB - larger than what I reported before). It specifically seems to be related to the size of the overall library - when I have it for example at 1.2079 all is ok, 1.2081 it fails with this error.
I did try moving the library and related files to the external drive but same result. abavetta, I think your suggestion of this script may be a workaround for now - although from what I read, is this not the same that you can do anyway with iTunes by holding the alt/option key open start up? In fact I do have two libraries now - one with the 2TB drive which I use at home and another for 2x500GB disks I carry with me when i travel. I just reported the same back to Apple but doubt if any immediate solution will come for this. Too bad as one of the great things about having such a large library is the mixes you can generate via Genius. Anyway, such is life and will just live with this for now. I also just found this program called Tangerine! http://www.potionfactory.com/tangerine/ which creates playlists like Genius - although through a different technique I might also take a look at.

Just to let all know that may be having a similar problem, what I found by accident to fix this problem.
Reset all my Home Folder permissions using the resetpassword method from the startup utility in Lion. Then turned off/on to reset Genius and cleaned out the cache folder for good measure. Finally after more than a year without, have Genius up and running again.

Home Network (Naming) Question

Hopefully this is an easy question for someone. (I'm not that network savvy)
In my router software setup (Belkin 7230) when I do a DHCP Client List trying to see my computers on the network the computer name for one of the computers is listed as (null). There is the IP address and the MAC address, but no host name for this one mac (iBook G4).
What do I need to do? Where does it get this name from? Where do I fill this out?
Any help would be appreciated!
Tom

On the specific computer, open System Preferences, go to Sharing, and fill in a name for the computer in the Name field at the top. You may find that this fixes the issue.
Matt

Architecture question, global VDI deployment

I have an architecture question regarding the use of VDI in a global organization.
We have a pilot VDI Core w/remote mysql setup with 2 hypervisor hosts. We want to bring up 2 more Hypervisor hosts (and VDI Secondaries) in another geographic location, where the local employees would need to connect desktops hosted from their physical location. What we don't want is to need to manage multiple VDI Cores. Ideally we would manage the entire VDI implementation from one pane of glass, having multiple Desktop Provider groups to represent the geographical locations.
Is it possible to just setup VDI Additional Secondaries in the remote locations? What are the pros and cons of that?
Thanks

Yes, simply bind individual interfaces for each domain on your web server,
one for each.
Ensure the appropriate web servers are listening on the appropriate
interfaces and it will work fine.
"Paul S." <[email protected]> wrote in message
news:407c68a1$[email protected]..
>
Hi,
We want to host several applications which will be accessed as:
www.oursite.com/app1 www.oursite.com/app2 (all using port 80 or 443)
Is it possible to have a separate Weblogic domain for each application,all listening
to ports 80 and 443?
Thanks,
Paul

Running MII on a Wintel virtual environment + hybrid architecture questions

Hi, I have two MII Technical Architecture questions (MII 12.0.4).
Question1: Does anyone know of MII limitations around running production MII in a Wintel virtualized environment (under VMware)?
Question 2: We're currently running MII centrally on Wintel but considering to move it to Solaris. Our current plan is to run centrally but in the future we may want to install local instances local instances of MII in some of our plants which require more horsepower. While we have a preference for Solaris UNIX based technologies in our main data center where our central MII instance will run, in our plants the preference seems to be for Wintel technologies. Does anybody know of any caveats, watch outs or else around running MII in a hybrid architecture with a Solarix Unix based head of the hybrid architecture and the legs being run on Wintel?
Thanks for your help
Michel

This is a great source for the ins/outs of SAP Virtualization: https://www.sdn.sap.com/irj/sdn/virtualization

Replication Architecture Question

Hello,
I have a problem with identifying the architecture for my materialized view environment. Let me tell you what I want to achieve:
I have a production database that is the source (master site) of my data. Portions of that data gets replicated to materialized view sites on a daily basis. The materialized view sites get accessed through the internet. The problem is that after the refresh more or less extensive calculations have to be done. during that time the materialized view site is not ready to be accessed via internet, because some data tables are not yet filled (they get filled during the calculations). That means there is a downtime of the system.
In order to eliminate this downtime I want to have 2 instances of the materialized view site, which get replicated sequentially, e.g. mv1 gets updated every 48 hours as well as mv2, but there is a time shift of 24 hours between the refresh of each materialized view site.
The webapplication accesses either mv1 or mv2. (it accesses mv1 while mv2 is updated and vice versa).
This approach will eliminate the downtime of the system.
But now i have a little problem with understanding the materialized view concepts. If mv1 is refreshed do all the entries in the materialized view logs at the master site get emptied? If so then I have a problem when i want to refresh mv2, because then only the changes since refresh of mv1 are present in the materialized view logs at the master site. so i will loose all the changes made to the database that already got replicated to mv1.
Is there a way of achieving the scenario mentioned above? What I want to have are separate materialized view logs for each of the materialized view sites.
Does anyone know how can I do this or has an alternative approach that fits to the above requirements?
Any suggestions are welcomed.
best regards
Mirko

Hi Justin,
Thank you for your reply. If I understand you correctly, the oracle replication mechanism automatically handles the situation of various materialized view sites that refresh from one master site at different times. Easily spoken, that means that oracle automatically stores all changes on the master site in one materialized view log for each table, but keeps track, which entry was already sent to the individual materialized view site (just as if there were one materialized view log for each materialized view site). So I don't have to worry about anything, when i want to refresh more than one materialized view site from one master site? All Materialized view sites will get the correct data?
If so then it sounds good.
I have another short questions for clarification of the materialized view technique:
What happens when the materialized view site refreshs and queries are sent to the materialized view site at the same time? What data will be used to perform the query?
My assumption is that until the refresh group (all mvs are within one refresh group) completed the update, the user (that initiated the query) sees the old data. Is that correct? Does that user notice (performance related) that the materialized view site is currently refreshed?
Regarding the calculation after refresh: Yes I have to do it after the refresh was made, because i have to call java stored procedures, that do the calculation. so i can't do it while creating / refreshing the materialized views.
regards
mirko

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