Can you cluster Coherence over data centers?

We're currently running two separate Coherence clusters in different data centers. One is prod, the other DR.
Would it be possible to cluster the nodes from each of these to create one cluster spanning both data centers? Then in a failover scenario the data would already be available.
I know Coherence nodes heartbeat to one another to retain cluster membership and that there is a TTL setting to determine packet life. Would have nodes in different data centers result in heartbeats being missed or TTLs killing packets?
Has anyone had any success with this?

Coherence performance is related to the latency between nodes. Having one cluster spread over 2 data centers could harm performance (some timeouts could have to be changed to prevent nodes from data center A to claim another node in datacenter B is out of reach/possibly dead).
When you lose network connectivity between the 2 data centers (note i'm not saying "if you lose connectivity". It WILL happen), you're welcome into the "split brain world", each half of the grid believing the other is dead and claiming to be the "master". And thus, if you have data replicated on N nodes, the master/backups are redispatched all over each datacenter, harming performance for a few minutes (the timing depending of course on many parameters...). And of course the data will no longer be synchronized between the 2 data centers. The quorum has to be thought of, and stuff like that...
I might be wrong, but AFAIK I'd rather have 2 separate clusters. I believe 12.1 has new features to replicate data the the master grid to the DR one, I have not been through all the new documentation.

Similar Messages

Can you Cluster MACs at home?

Can you cluster Mac computers at home so they all use the same account/user information, and share all locally mounted volumes using somthing like Mass Storage Control Protocol?
I have Tiger version 10.4.10
Power Mac Dual G5
iMac G5
Mac Mini G5
and soon to be added 24" core 2 duo iMac
I also have a Black Mac Book Core duo, but it would not be a member of the cluster.
If this is not possible, will it be possible in Leapord?
Thank you in advance.

Mac OS X support the Unix Network File System (NFS). However, it leaves out
the GUI.
NFS Manager is a small tool for easy access to the NFS features of Mac OS X. As an operating system with a Unix core, Mac OS X is able to support the Network File System (NFS) protocol. NFS is the accepted industry standard for sharing files between Unix systems.
http://www.bresink.com/osx/NFSManager.html
This page show you how to use NetInfo Manager:
http://mactechnotes.blogspot.com/2005/09/mac-os-x-as-nfs-server.html#c1168221713 40271068
Once you figure out how NFS Manager configures the NFS shares, you can
use Applications > Utilities > NetInfo Manager to create more shares.
You will either have to coordinate Unix Userid number and Unix Group Id number or use the mapall option on the share.
To find out your Mac OS X userid and group id do:
applications > utilities > terminal
ls -ln
ls -l
# lists the NFS share on your mac
showmount -e localhost
#list NFS shares on a remote host
showmount -e remote-ip-address
Once you see what NFS Manager does, you will be able to use NetInfo Manager to manage a connection. In Mac OS 10.4 you can configure the /etc/exports control file. See man exports for the details. Before that you had to have the data in NetInfo manager. When Mac OS X came out, many common Unix control files were not present. Instead the data had to be in NetInfo manager. Over time Apple has added more and more standard Unix control files.
===============================================================
It's best to have common uid's and gid's.
This is tricky stuff.
You need to change these things:
1) Your account information
2) All of your files & folders
One way to change what uid and gid are defined for your account is theNetInfo Manager application. This doesn't change the UID & GID on your files and folders.
Mac OS X ... harddrive -> Applications -> Utilities -> NetInfo Manager
In the middle column is the function. Pick users then select your user. Click on the lock at the bottom of the panel. Go into the property list and change UID and GID."
sudo find -x / -user 501 -exec chown 5464 {} \;
sudo find -x / -group 20 -exec chgrp 211 {} \;
There are two generally used schemes for assigning a group to a user:
1) Assign all users to a common group like staff.
2) Assign each user to their own group. A user like test would be in group test.
Mac OS uses method 1 in 10.2 and method 2 in 10.4.
You should not have multiple users assigned to the same uid. My worry is that if you are only change in the 50x range, you could run into a conflict.
Your best bet is to change to a high number like 5464 on all of your accounts.
On Mac OS, there are a few files that have the old uid as part of their names. The .Trashes file will be on your removal media and maybe everywhere.
/.Trashes/501
/Library/Caches/com.apple.IntlDataCache.501
/Library/Caches/com.apple.IntlDataCache.sbdl.501
/Library/Caches/com.apple.user501pictureCache.tiff
Here are some terminal commands:
Macintosh-HD -> Applications -> Utilities -> Terminal
cd /Applications
Your current user is:
echo $USER
Let's assume myuser
To find out your UID and GID do:
cd ~
ls -ln
ls -l
Or, you can use the id command.
id
compare the output and write down what you find.
You best use the numeric value for your userid. In this case it is 500. To list all the files owned by a userid do:
sudo find / -user 500 -exec ls {} \;
#And you need to do this from an administrator id.
/* adding a -x before the / limits the search to the current file system. *
# To stop the display press control-c
sudo find -x / -user 501 -exec chown 5464 {} \;
#And you need to do this from an administrator id.
Hope this helps a little.
Robert
PS. This is a lot, but I hope it helps.

?? Can you transfer iPhone 3GS data and apps to an iPhone 5S

?? Can you transfer iPhone 3GS data and apps to an iPhone 5S ??

Yep. Follow the directions here:
http://support.apple.com/kb/HT2109

HT2500 Can you categorize archives by date, from or to as you can in outlook?

Can you categorize archives by date, from or to as you can in outlook? My question actually pertains to Imac but is the same issue on all platforms.

First we need to sort out what platforum are you using?
mac, iPhone, ipad
What version of the OS are you using?
What app areyou running?
How about a screen image of the archive you are using?
How to show us a screen image. Avoid personal identification.
command + shift + 3 Will take entire screen. You hear a click.
command + shift + 4 Lets you decide what to take. Mouse pointer changes. Move mouse to upper left corner of desire image. Hold down left mouse key where to start image. Drag mouse to lower left of where you want to stop image. Release mouse.
You will get a picture n.png file on the desktop.
one the forum input panel you will see the camera icon.
click on camera icon.
another window will appear.
Make sure you have selected the from your computer tab.
click on Browse button
An open file panel appears. Select the file.
After selection a file, I have this screen showing.
You will have to click on Insert Image. You may have to scroll down to see Insert Image button.

Race conditions - can you actually lose the data in memory?

I've seen posts where a race condition can actually destroy the contents of a global memory. I understand about not getting the right information if your read just beats your write, but can it actually lose the data altogether? This would mean you have to semaphore every time you write to a global if you have something polling on it to guarantee the data doesn't get lost. I've never seen this in any example programs - its hard to believe!

I think the idea is merely that when you write to a global (or any)
variable the previous contents are overwritten. If you intended to read the
global before the write but the write ends up happening first then you lose.
"mikema111" wrote in message
news:[email protected]..
> I've seen posts where a race condition can actually destroy the
> contents of a global memory. I understand about not getting the right
> information if your read just beats your write, but can it actually
> lose the data altogether? This would mean you have to semaphore every
> time you write to a global if you have something polling on it to
> guarantee the data doesn't get lost. I've never seen this in any
> example programs - its hard to be
lieve!

Can you retrieve BB Protect data with another program?

Can you download your Blackberry Protect date (ie. Address book) to another program? I want to get my contact info but I no longer have a cell phone.

Hi Thomas,
Thanks for the info. Based on my experiments, that's the conclusion I had come to as well, but it's good to get confirmation.
My work around is to break every TX transaction into small pieces. The NI 8452 supports streaming sample sizes of up to 64 bits (8 bytes). I can make a transaction that is one sample long with "samples" of 4, 6, or 8 bytes, as needed. Continuing my original example, I can do this:
NumBytes = 8;
ni845xSpiStreamConfigurationSetNumBits(StreamHandle, 8 * NumBytes);
ni845xSpiStreamConfigurationSetNumSamples(StreamHandle, 1);
ni845xSpiStreamConfigurationWave1SetMosiData(StreamHandle, WriteData, NumBytes);
ni845xSpiStreamStart(DeviceHandle, StreamHandle);
And I see this transmitted:
0x0102030405060708
You can repeat the SetMosiData and StreamStart steps for each additional block of TX bytes.
I would like to use the ni845xSpiWriteRead() function (that would be much easier), but that doesn't work with the broken pre-production SPI slave I need to talk to. (We will fix it, but I need to work around the problems for today). I need to generate a very small delay at the end of the transaction between when the serial clock stops and when CS deasserts, or else my transaction is ignored. I measured the delay between SPC deassertion and CS deassertion produced by ni845xSpiWriteRead() at 1.19 us. In order to talk to my broken SPI slave, I need a much shorter delay, on the order of one SPI clock period.
So yes, I hope to upgrade to the basic SpiWriteRead function in the future, but I can't use it today.
Thanks for your help.
-jskroch

Exchange mailboxes, corporate AD, forest trust, arrays, Can you look this over?

This is my first script, it took a while to figure some things out, but it is working. I wanted to know if it is overkill, or if there is something that sticks out that would be an easier way of accomplishing something with this script.
Background info:
Company was bought out, forest trust set up between corp network and ours (years ago). So what we wanted was to compare exchange mailboxes with linked mailboxes array, to be compared to corporate AD array with user accounts that are disabled. a list is created
in another script which shows linked mailboxes and disabled corp AD accounts, helpdesk looks these through to make sure there are no exceptions. Exceptions are entered into PS cmdline, those are pulled out of the array. Then the left objects in the array are
PST backed up to network share, and then mailboxes removed. Admin trust across corp allows Exchange admin to search through Corp AD through search-AdAccount cmdlet. The script is run from a VM with exchange server tools installed and running 32-bit os of Windows
7 and 32-bit Office (Because that's how great... Exchange 2007 is for exporting mailboxes to PST).
Not sure of this, though it works:
<#Clear variables so they are not retaining any old values#>
Get-Variable -Exclude PWD,*Preference | Remove-Variable -EA 0
Wanted to clear variables before running script, data was being held over each run before adding this in
Here is the code "xxxxx" used in lieu of server names:
<#Import in modules, if statement for PSSnapin so that it doesn't throw an error if it is already loaded.#>
Import-Module ActiveDirectory
if ( (Get-PSSnapin -Name Microsoft.Exchange.Management.PowerShell.Admin -ErrorAction SilentlyContinue) -eq $null )
add-pssnapin Microsoft.Exchange.Management.PowerShell.Admin
<#Clear variables so they are not retaining any old values#>
Get-Variable -Exclude PWD,*Preference | Remove-Variable -EA 0
<#Variables needed to complete script. $testIteration shows the number of times nested for loop happens, $exUserCorpMatch=@() is an empty array that will have objects added to it
when linked mailboxes on Exchange are compared to disabled corp accounts, the $adminUser and $adPW are the login credentials so that anyone can enter admin login credentials to run script#>
$errorLogPath = "c:\scripts\logs\exchangeADerror.txt"
$testIteration=0
$exUserCorpMatch=@()
$adminUser = whoami
$exceptionUsers=@()
$exceptionArray=@()
<#Create an Array from Get-mailbox cmdlet that has the value "LinkedMailbox" tying it to a Corporate account, .count value used to check results against expected#>
$mailboxes = Get-Mailbox -resultSize unlimited -RecipientTypeDetails LinkedMailbox
$mailboxes.count
<#Create an array of objects from Corp server of user only dissabled accounts, .count value used to check results against expected#>
$corpAccDis = Search-ADAccount -ResultSetSize $null -Server xxxxx -AccountDisabled -UsersOnly
$corpAccDis.count
<#Read in a list of users whose mailboxes shouldn't be removed#>
while ($var -ne "q"){
$var = Read-Host "Enter user exception linked mailbox name, or press q to quit entering names:"
if ($var -ne "q"){
$exceptionUsers += $var
$exceptionUsers.count
<#Create an Array with the usernames that were supplied by the Read-Host Cmdlet#>
foreach ($name in $exceptionUsers){
$exceptionArray += Get-Mailbox -Identity $name
$exceptionArray
<#Compare the two arrays on the value of name from the "Linked Master Account" and the Corp server "Sam Account Name" and insert the matching objects into an Array#>
For ($a=0 ; $a -le $mailboxes.count -1 ; $a++){
For ($b=0 ; $b -le $corpAccDis.count -1 ; $b++){
$testIteration++
if ($mailboxes[$a].LinkedMasterAccount.Split("\")[-1] -eq $corpAccDis[$b].SamAccountName){
$exUserCorpMatch += $mailboxes[$a]
break
$testIteration #Test value checking nember of times the loop took place
$exUserCorpMatch.count
<#For loop to take exception users mailboxes out of the script#>
For ($d=0;$d -lt $exceptionArray.Count; $d++){
$exUserCorpMatch = $exUserCorpMatch| ? {$_.alias -ne $exceptionArray[$d].alias}
$exUserCorpMatch.count
$exUserCorpMatch | sort
<#Taking the newly created array from the comparison and running the bulk of decisions, gives full access rights to the before entered admin account, then exports the mailbox to a PST
file on the network share, and produces a txt file of the users properties, attributes, etc.. Then removes-mailbox, this is cmdlet is currently commented out until testing is done and
confirmed removal is ready to take place. #>
for ($c = 0 ; $c -le $exUserCorpMatch.count -1; $c++){
$fileCreationTime = Get-Date -UFormat "%Y%m%d%H%M%S"
$displayName = $exUserCorpMatch[$c].DisplayName
$pstFolderPath = Join-Path "\\xxxxx\exchangePST\" $fileCreationTime$displayName.PST
$txtFolderPath = Join-Path "\\xxxxx\exchangePST\" $fileCreationTime$displayName.txt
try {
$everythingIsOk = $true
Add-MailboxPermission -Identity $exUserCorpMatch[$c] -User $adminUser -AccessRights FullAccess -ErrorAction Stop -Verbose
} catch {
$everythingIsOk = $false
Write-Warning "Permission add problem, logging error to $errorLogPath!"
Write-Warning $error[0]
$error[0] | Out-File $errorLogPath -Append
if ($everythingIsOk){
try{
Export-Mailbox -Identity $exUserCorpMatch[$c] -PSTFolderPath $pstFolderPath -ErrorAction Stop -Verbose
}catch{
$everythingIsOk = $false
Write-Warning "Export problem!"
Write-Warning $error[0]
$error[0] | Out-File $errorLogPath -Append
if ($everythingIsOk){
try {
Get-Mailbox -Identity $exUserCorpMatch[$c] | FL | Out-File $txtFolderPath -ErrorAction Stop -Verbose
} catch {
$everythingIsOk = $false
Write-Warning "Problem writing to txt"
Write-Warning $error[0]
$error[0] | Out-File $errorLogPath -Append
if ($everythingIsOk){
try{
Write-Verbose "!!!!!!!!!!!!!!!!!!"
<#Remove-Mailbox -Identity $exUserCorpMatch[$c] -Permanent $true -ErrorAction Stop -Verbose#>
} catch {
Write-Warning $error[0]
$error[0] | Out-File $errorLogPath -Append

Half of you code appears to be doing nothing.
This does nothing:
if ($everythingIsOk){
try{
Write-Verbose "!!!!!!!!!!!!!!!!!!"
<#Remove-Mailbox -Identity $exUserCorpMatch[$c] -Permanent $true -ErrorAction Stop -Verbose#>
} catch {
Write-Warning $error[0]
$error[0] | Out-File $errorLogPath -Append
The way we do a limiting Try/Catch is to just use a single "try/catch".
$fileCreationTime = Get-Date -UFormat "%Y%m%d%H%M%S"
for ($c = 0 ; $c -lt $exUserCorpMatch.count; $c++){
$displayName = $exUserCorpMatch[$c].DisplayName
$pstFolderPath = Join-Path "\\xxxxx\exchangePST\" $fileCreationTime$displayName.PST
$txtFolderPath = Join-Path "\\xxxxx\exchangePST\" $fileCreationTime$displayName.txt
try {
Add-MailboxPermission -Identity $exUserCorpMatch[$c] -User $adminUser -AccessRights FullAccess -ErrorAction Stop -Verbose
Get-Mailbox -Identity $exUserCorpMatch[$c] | FL | Out-File $txtFolderPath -ErrorAction Stop -Verbose
<#Remove-Mailbox -Identity $exUserCorpMatch[$c] -Permanent $true -ErrorAction Stop -Verbose#>
}catch
Write-Warning $error[0]
$error[0] | Out-File $errorLogPath -Append
The following does the same thing your code did. It executes but aborts further execution on an exception.
¯\_(ツ)_/¯

Can you get file creation dates for Nomad II .NVF fil

Hi,
I have an old Nomad II MG that has several voice recordings of my daughter over the last 4 years, but I don't know the dates they were recorded.
Is there a way to get the actual date of the recording from the Nomad device? All I seem to end up with is the current date when I upload it into Windows.
Thanks...
lj

Hi,
Newbie to SharePoint, learn quite a lot from the links you provided.
“I found out that the original dates are only available in SharePoint if the explorerview has been used”, this would make sense because the original creation time is generated
by the file system in the local machine.
However, when a file is uploaded to SharePoint library, it will be stored as binary data in the database, as well as the newly created time. It means that it will be a “new” file
in the SharePoint site regardless of where it comes from.
Per my knowledge, the only way I can suggest is that you will need to create a client desktop application for the file uploading, which will be a more general way not only for
uploading a file, but also when we need to migrate files between different systems.
Thanks

Can you set a due date in Reminders on Mountain Lion?

It seems that there is no way to set a due date for a task in Reminders on Mountain Lion. In Lion in iCal you could set a Due Date that was different than the reminders you could set for a task. It seems obvious to me that reminders are different than due dates. Reminders can occur multiple times leading up to and on the due date (and perhaps even after a due date), but it is helpful to set a due date. Hopefully Apple will bring this functionality over to Reminders from the Lion version of iCal, as this is a downgrade in this one respect for me.

After having created a reminder, click on the little that appears when you hover over the right side of the list.
Or, when creating a reminder, add the time and date, like this:
"Say Hello 6:32 pm today"

Can you automatically embed Exif data in DNG files LR4

For years I have been using Bridge and ACR for my raw workflow. I use only DNG files and have the database turned off so the EXIF data is embedded right into the original DNG file. This means my files are 100% portable without and sidecar.
Can I work with lightroom 4 without having a database? OR can I assure that each DNG file has all it's setting automatically embedded as it does in Bridge?
Thanks,
Tom

In the catalog settings, metadata tab, there is an option to automatically write to XMP. That should do what you want. Since there is no sidecar file with the DNG file exif data will be written to the file.

Can you include an external data source in query condition?

Hi all,
I have a user that wants to run a report off a subset keys in an external data source. Is this possible in Disco Plus?
For example, he has an Excel file that is just a list of employee numbers. He then wants his Disco query to only bring back the employee records for the people listed in the Excel file. Right now, he uses Cognos and can do this. A visual representation of this would be a condiition that would accomplish something like this:
WHERE EMPLOYEE_NUMBER IN (Excel row 1, Excel row 2, Excel row 3, ...)
We do not want to have to load the data into a table each time to accomplish this, but no other way readily jumps out at me. Anyone have any ideas?
Thanks in advance,
Jewell

Jewell.
Given the situation you describe, I don't know of any 'reasonable' way to do this either the GUI in Desktop or the interface in Plus.
However - and just for the grins - there may be a possibility if done through the command line interface of Desktop. I truly doubt you'll want to do it - given the limitations - but ...
... in the command line interface you can put in the switch for /parameter such as: /parameter today trunc(SYSDATE), which means that your report is looking for a parameter called 'today' and you're putting in the data to put in the parameter 'trunc(SYSDATE)'.
So, you could either build the command line with a batchy-kinda-process in that via batch it reads a file as input and puts parameters, or hard code it manually (which no one would want to do). Problem is, if you have multiple values, I don't think it'd work as you're saying something like:
/parameter today (SYSDATE,SYSDATE-1,SYSDATE+!) - which I doubt would work as it probably only wants one value
or if you had:
/parameter today SYSDATE /parameter today SYSDATE-1 /parameter today SYSDATE+1
it also might choke.
Alternatively, you could investigate using Plus with the Java command line utility and see if it's possible to do a similar thing via Java.
... so long answer to a short question ... (my specialty) 8-)
Russ

HT201299 Can you set a cellular data limit on one specific phone

My phone always seems to make my family's cell plan go over. I have figured out many ways to help not use so much data. My brother has an HTC One M8 and he can set a limit that his phone will not let him go over. I really want that because I dont want to be blamed for it.

Not that I'm aware of. I would check with your cellular provider and see what cellular limiting options they offer.

Can you sync ATV over the internet?

Is it possible to sync ATV over the internet?
If so how do you accomplish this?

I would like to know what kind or brand or VPN you are using? IPSec, PPTP, L2TP. Regular IPSec does not support passing GRE and multicast datagram packets. This is how bonjour works. PPTP is a layer 2 protocol and should pass GRE just fine.
There is another method I am examining. Using an SSH tunnel. I've actually gotten iTunes sharing working over the net using Fugu and Network Beacon. The process is a little difficult to understand at first but it works perfectly. Essentially you create a tunnel to your local mac and "host" the tunnel on the remote mac that has iTunes. Then you create a mDNS beacon via network beacon that lists an iTunes share at the port specified (3689). Again, it's weird at first but one you get it it works perfectly.
I am investigating using the same method for the apple tv. The problem is the Apple TV uses 3 different bonjour beacons to work. One for pairing, one for recognition, and one for syncing. Pain in the butt. I am using bonjour browser to monitor the apple tv process. In theory, the SSH tunnel should work just fine. One would then need to hack the AppleTV to enable SSH on the device. The device would host the tunnel. Then create the needed mDNS beacons and sync from a distance. Easier said than done I suspect.
The free VPN client from LogMeIn.com is another potential as it specifically supports GRE and multicast data gram packets.
Cross our fingers.

Can you apply titles over Photos?

At the end of my video, I added the credits introducing the cast of the play...I created a clip of the name of the actor followed by a clip of a photo of same
But is there a way to apply the text directly on to the photo clip?
Thanks!

Hi Lizette - you can most certainly apply a title to a clip or still. First make sure that the 'over black' box in the Titles Pane is not ticked. Then drag the small blue 'T' to the beginning of the clip over which you want the title to appear.
Just make sure that the clip's duration is sufficiently long to accept the title's duration.
If you did not want the title to appear at the start of the clip, then split the clip before adding the title.
Hope this helps.

Can you cluster two nodes from subnet A with the cluster itself residing in subnet B?

We have a situation in a cloud deployment where the servers are automatically provisioned through a cloud portal with IP addressed from subnet A. Because we require static IP for clustering, the static IP can only be provisioned from subnet B for
use by the cluster. Is it possible to create a cluster from the two nodes in subnet A from a cluster IP in subnet B? I cannot find any mention of this particular network configuration for a Windows cluster. We are using the cluster to support
SQL Server 2012 AlwaysOn Availability Groups.

Hi Sir,
>>the servers are automatically provisioned through a cloud portal with IP addressed from subnet A.
Did you try to create a new VM then give it an static IP from subnet B then check if the VM can be accessed from outside ?
Best Regards,
Elton Ji
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] .

Can you cluster Coherence over data centers?

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