Replication is the process of sharing information so as to ensure consistency between redundant resources, such as software or hardware components, to improve reliability, fault-tolerance, or accessibility.

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Remote to remote block level replication

I have to sync 2 iSCSI LUNs together at block-level (mandatory), asynchronous, only in the night, I found some tools to do it when Remote to Local or Local to Remote, but I cannot install anything on ...
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2answers
800 views

How to move the files of a replicated database (SQL Server 2008 R2) to a different drive

I would appreciate if someone could help me with the following problem: We use two SQL Server 2008 R2 databases under transactional replication: transactional publication with updatable ...
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260 views

Possible to make mysql server both master and slave?

I am getting ready to move a database from one server to another. In order to reduce downtime for the client, I am wondering if it would be possible for me to turn on replication and give it time to ...
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3answers
959 views

MySQL to PostgreSQL replication

Is there way to replicate in near-realtime MySQL changes to equal PostgreSQL database?
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2answers
2k views

--log-slave-updates is OFF but some updates are still logged to the slave binary log?

MySQL version 5.5.14 According to the document, by the default, slave does not log to its binary log any updates that are received from a master server. Here are my config. on the slave: # egrep ...
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2answers
796 views

How to scale out OpenStreetMap data efficiently

For over a year now, I'm running an in-house PostGIS server filled with OSM data, used for both Mapnik-based tile generation and Nominatim-based geocoding, updated with day replicates. This works ...
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3answers
240 views

Converting our budget-strapped dev environment to ESXi - how to maximize availability on the cheap

We've already run through the process of virtualizing our production servers and now we want to do the same with our dev environment. However, our provider took care of all of the ESX host and cluster ...
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507 views

Offline Address Book Not Replicating Between Exchange 2010 and Exchange 2003

I have recently installed Exchange 2010 in our Exchange 2003 (SP2) environment. So far everything has been great, until we noticed creating new users does not populate the OAB for people still logging ...
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568 views

ZFS replication between 2 ZFS file systems

I initially replicated tank/storage1 --> usb1/storage1-slave (depicted below), and then (deliberately) destroyed the snapshot I replicated from. By doing this, did I lose the ability to incrementally ...
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922 views

Apache replication

I don't know what I need to search for. I need information about how to "replicate" an Apache server, if one would go down another would take over. Also the Apache server holds a lot of data files. ...
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3answers
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Active Directory Replication across Sites slow or not working

I've just inherited (isn't it always the way!) a Windows Domain. The domain is spread across 2 sites. Site01 has 3 DCs & Site02 has 2 DCs. If I create a user in either site, the other DCs in ...
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43 views

database replication for new user signup

I have a database that stores the users of my application. When a new user signs up, a record is inserted into the database for that user. I have a replicated version (slave) of this database (using ...
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6k views

DRBD Not syncing between my nodes

Some version info: Operating system is Ubuntu 11.10, on EC2, kernel is 3.0.0-16-virtual and the application info is: Version: 8.3.11 (api:88) GIT-hash: 0de839cee13a4160eed6037c4bddd066645e23c5 build ...
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225 views

SQL-Server 2008 : Table Insert and Range Check ?

I'm using the Table Value constructor to insert a bunch of rows at a time. However if i'm using sql replication, I run into a range check constraint on the publisher on my id column managed ...
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3answers
226 views

What backup method should I choose to backup database on high-load server

I have a mysql (MyISAM) database with size around 30Gb. It has single large table (and some smaller ones but it makes no difference). It performs around 2000 selects (single row by primary ...
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2answers
318 views

Windows Server 2003: Replication between DC's takes place only after changes are made?

I just finished the 70-294 Kit, and I am left with a huge knownegde gap: The instructor says that replication taked place 15 seconds after a change is made, and 3 seconds addition for any additional ...
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2answers
3k views

DFS-R alternatives?

I was wondering what alternatives to DFS-R are out there on windows machines for real-time bidirectional file & folder replication? DFS-R requires active directory and a domain controller which I ...
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1answer
87 views

Strange issue with one CCR node exchange 2007

When I fail over to one of our exchange nodes, the store.exe has a very high CPU. It goes to about 50-60% even with no users connected. With users connected it stays up near 100%. On the other node ...
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2k views

Exchange 2003 to 2010 public folder replication

I've found several guides and tutorials on public folder replication from 2003 to 2010, but am still a little bit confused. What we have, is a 2003 exchange server obviously holding all of our public ...
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640 views

Very slow MongoDB replica set

I have set up two Mongo instances in EC2 having RAID10. I set up replica set using those two servers and found that this replica is very very slow over network. If I log in locally and issue query ...
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3k views

Ubuntu + ZFS: How to migrate entire system to new disks?

Here's my scenario: I have Ubuntu with native ZFS installed on a server with 2 x 500 GB SATA disks. I installed it following this guide: ...
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239 views

Fault tolerant DBMail with PostgreSQL Replication - what are my options here?

I'm currently planning a more fault tolerant setup for my organizations Mail setup. We currently have two machines available in different datacenters, that we're planning to use for this, one being a ...
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1answer
175 views

How hard is it to setup SQL Replication? Can it be done by a Semi SQL User? [closed]

I'm a semi SQL user, not a DBA, just a regular programmer. One of my upcoming jobs require a SQL replication configuration. I have never done such configuration before My colleagues have been ...
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1answer
289 views

Adding a new location through Active Directory. How should it be done?

Our entire Active Directory forest is currently on a single 10/8 private subnet. We're looking to migrate most of our servers to a cloud provider, but I'm not sure how to set up the first domain ...
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2answers
2k views

Amazon RDS to EC2 replication [duplicate]

Possible Duplicate: Is it possible to use an EC2 RDS MySQL instance as a slave to an external master? My read-intensive application needs to scale horizontally. It will be deployed by ...
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2answers
181 views

MSDE 2000 to MSSQL 2008 SQLExpress replication

I have an old database on MSDE which I need to replicate (one-time process) to a new MSSQL 2008 SQLExpress installation. What are my best options to replicate without involving messy sql scripting? ...
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1k views

Memcache Master and slaves

I'm using memcached-1.4.5-1.el5 & memcache-2.2.6 as php extension and memcached-1.2.8-repcached-2.2.1 for replication. The above packages are installed on 4 servers. How can I do the following? ...
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1k views

DRBD or similiar RAID over net on slow/limited networks

I am looking for ways to create some kind of file replication without losing too much performance on file operations. A real RAID is not an option due to non-technical constraints. As far as I ...
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1answer
359 views

MySQL init.d script with different configuration file

I have two instances of mysql running on a server. I need two different init.d scripts. The two instances have different configuration files /etc/my.cnf and /etc/my-slave.cnf. I copied the ...
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1answer
167 views

MySQL Replication: Move slave to be slave of another slave, without any (or least possible) downtime

I have the following setup: M1 = Master 1 S1 = Slave 1 S2 = Slave 2 S3 = Slave 3 Where all slaves are replicating directly from M1. I would like to move S2 and S3 to be slaves of S1. I'm not sure ...
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2answers
913 views

Safe initial sync for SQL Server OLEDB/ODBC Replication

I am trying to setup one-way, transactional replication from SQL Server 2008 R2 to PostgreSQL 9.1. I'm trying out the PGNP OLE DB provider. I can successfully create a subscription, and transactions ...
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1answer
5k views

Why does replication fail with error Duplicate entry for key?

We have been replicating for a year or two now with little problem. Sometimes we get an erroneous SQL query which stops replications, and we use the following commands to get it going again: STOP ...
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321 views

One Way Replication of Oracle 11g to MSSQL 2008R2

We're in the midst of a major LOB system change which will use Oracle 11g, but we need to maintain a LARGE number of existing reports in SSRS. What is a good method to automate a one-way, read-only ...
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1k views

Expected performance of e-SATA port multiplication?

For a certain read/write workload, I get 30 MiB/s from a 4-disk array using esata port multiplication. When I move the exact same array to four individual sata connections, I get 90 MiB/s for the same ...
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2answers
211 views

Is there a safe way to bypass a non-replicating DC?

We have a domain controller that was virtualized a while back; this caused issues with replication that we're now seeing fallout from. I've moved the PDC Emulator and other fsmo roles to a new DC and ...
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470 views

Distributing SQL Server on Internet regarding security issue

We are going to put our servers in two places to keep high level redundancy and to avoid bandwidth critics. The two servers are on different LANs but communicate over a WAN network (via Internet). One ...
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64 views

SQL server backups - backwards situation

Hi I'd like to know if it seems feasible to do things in this manner. We have several application servers (a web server for intranet applications, a couple of different app servers). Each server is ...
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1answer
1k views

How can I provide live replication of a Linux server?

I need to be able to do live replication of a running Ubuntu server, so if the main machine goes down I can automatically failover to the other machine. I found mklivecd, but that seems to only get ...
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1answer
78 views

Aggregating data from multiple MySQL servers

I have 10 MySQL servers and each one holds a database that needs to be replicated to a single, centralised MySQL server. The complexity is that each server must replicate its database to the same ...
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1answer
199 views

What are possible results/side effects if replication between DC's in a Windows domain is unable to occur?

There's plenty of administration literature out there how to properly manage Windows servers. But in dealing with real life, things don't always occur like you want them to. In Microsoft's Windows ...
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3k views

Way to avoid server downtime when creating Master - Slave relationship?

I am preparing for setting up a MySQL master-slave or master-master relationship. Right now I have a single MySQL production server, and of course I don't want a lot of downtime while I connect the ...
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1answer
1k views

Very poor optimization: Riverbed-Test-Appliance and NetApp SnapMirror replication

We are actually testing Riverbed Steelheads in order to accelerate replication using SnapMirror between two sites. The distance ist 100km between the sites. Connection: 150Mbit MPLS Network Systems: ...
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1answer
255 views

How to use AppScale

There are some wiki which explain how to install and setup AppScale. But I didn't find anything related to the extensive use of AppScale. I mean, what to do in case of major outage ? If the node ...
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1answer
315 views

DFS Replication, Losing folders

We lost a lot of folders in one part of our AD. I tracked down that we get a lot of errormessages about this in this form: How do we solve this? Why does this happen? (Some information edited) ...
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3answers
7k views

Run a MongoDB configuration server without 3GB of journal files

For a production sharded MongoDB installation we need 3 configuration servers. According to the documentation "the config server mongod process is fairly lightweight and can be ran on machines ...
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3answers
1k views

multi-master replicated dynamic dns subdomains

For lack of a better title. Our environment requires having subdomains where we allow dynamic updates using bind as the DNS server and its nsupdate utility authenticating via keyfiles. We're looking ...
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1answer
252 views

Secure Microsoft Active Directory DC to DC communications through firewall boundaries

We are currently looking to flatten our AD structure a bit to make things a bit more manageable, but we still want to keep our security posture as near as possible to where it is now. Currently, we ...
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25 views

2 databases locked, but only one can be successfully dumped (backed up do *.sql file) … fail

i have this situation 2 large databases on mysql server - srv1 I need to transfer both to new server - srv2 so I use sql command "FLUSH TABLES WITH READ LOCK;" to stop all modifications Then I ...
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318 views

Replacement for MySQL proxy

We have a standard MySQL Master/Slave replication for our database. In order to use the slave server we have set up MySQL Proxy. However we have been strongly discouraged to use it as it still alpha ...
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3k views

Server 2008 DC rejecting replication requests

Have a DC that has recently been part of a business continuity test. From what I understand the server (which is virtual) was snapshotted, test carried out while the link between the two sites was ...