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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Quickly change Active Directory Replication Schedule for all Sites & Sitelinks

My company has more than 80 sites, and my predecessor for reasons unknown to me put in a large chunk of time preventing replication between the HQ's DC and the branches' RODC. I need to reset their ...
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1answer
215 views

hosted failover(proxy?) service - does it exist?

We're in the planning phase to make our web application services redundant. Right now we've got our own physical servers at a colo, running a VMWare cluster connected to an EqualLogic SAN. It's a LAMP ...
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1answer
261 views

Replication with Veeam causes timeouts on large VM's

I have been trying to replicate two of my larger VM's one being Exchange 2003 and once the snapshot begins to commit the server begins to time out. I have updates my ESX hosts from 4.0.0 to 4.1 and ...
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3answers
2k views

MySQL per-database replication?

So, my problem is interesting: we want to migrate from one server to another. We made a master-slave replication, but my boss came with the idea to make migration one database at a time. So he asked ...
2
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1answer
4k views

How can I check that DFS is replicating correctly? [duplicate]

Possible Duplicate: compare the contents of two folders that are replicating by dfs We use DFS to replicate files to a Disaster Recovery server. We have a task where we check the DR ...
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1answer
98 views

Weird Active Directory behavior after ADMT migration

We have multiple sites with multiple DC's. Since performing the migrations we have been experiencing all sorts of problems with DFSR etc. We have multiple objects in the AD .. DCNAME ...
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2answers
686 views

Checksumming mysql replicas over ssl

After hours of struggling to understand the way percona toolkits (2.1) pt-table-checksum works, I try to try you. Situation Running MySQL replication (Master-active:Master:passive) Slave user is ...
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2answers
279 views

mysql replication 1x master, 1x slave

I have just setup one master and one slave server, but its not working.. On my website I connect to the slave server and I insert some rows, but they do not appear on the master and vice versa.. What ...
3
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1answer
299 views

What is and what is not replicated in a glassfish cluster with a mod_jk load balancer?

I have a Glassfish (3.1.2) cluster over 2 computers as nodes, with a mod_jk load balancer. Are servlet instance variables replicated perfectly? If not, how do I make sure it is? Are all actions, ...
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2answers
251 views

What's the cleanest way to reversibly break SQL Server replication?

I'm playing around with SQL Server Agent alerts, hoping that I can get some reliable error notifications sent out when our transactional replication breaks. To test it however, I need to break it. I ...
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0answers
398 views

Ways to speed up MogileFS rebalance?

I am in the process of upgrading storage for our MogileFS cluster and am using the rebalance and device drain features to migrate data from one set of devices to another. We have about 55 TB on one ...
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1answer
113 views

mongod: automatically initiate replica-set

Currently I manually execute the rs.initiate() in the shell after starting a mongo primary or secondary machine to join the replica-set "farm". Doesn't the /etc/mongodb.conf allow me to define the ...
2
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1answer
2k views

What the best way to achieve RPO of zero and lowest possible RTO (less than 15 minutes) with SQL 2008 R2?

We are running a payments (EFT transaction processing) application which is processing high volumes of transactions 24/7 and are currently investigating a better way of doing DB replication to our ...
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1answer
1k views

HAproxy with MySQL Master-Master Replication incredibly slow

I have two MySQL servers in multi-master mode, with an HAproxy machine for simple load balancing/redundancy. When I am connected to one of the servers directly and try to update about 100,000 entries, ...
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4answers
563 views

Data replication between two web nodes

I have Wordpress installation running on two web servers (Nginx). There is unidirectional synchronization from server A to server B and I'm using lsyncd for this purpose. with his configuration I ...
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2answers
181 views

Scaling web application with SQL Server 2008 database

I have a database which has 90% of read only tables. 10% of the tables has writable data. We need to scale the ASP.NET application.We need to add more users who will not be writing to the database. We ...
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2answers
16k views

Why is GPO Tool reporting a GPO version mismatch when the GPO version #'s do match?

Any ideas why the group policy diagnostic utility GPOTool would report a GPO version mismatch between two domain controllers if the version numbers are a match? Policy {GUID} Error: Version mismatch ...
2
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1answer
128 views

For a simple replication over 2 server computers, should I use glassfish replication or ubuntu replication, or something else?

I want to set up a simple replication or exact mirroring, using 2 server computers I just bought, for the following purpose: I want to set up some websites, which, by design, may eventually need to ...
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1answer
238 views

SQL Server 2008 Snapshot Replication Trigger Start

I have setup a production server and a staging server. Whenever we are at the point in our release cycle where we want to begin testing on staging I want to copy the production DB over to our staging ...
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1answer
558 views

OpenLDAP replication fails, “syncrepl_entry: rid=666 be_modify failed (20)”

I've configured a second host to replicate the main LDAP server via syncrepl in the slapd.conf: syncrepl rid=666 provider=ldaps://my-main-server.com type=refreshAndPersist ...
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3answers
100 views

How do I data warehouse a set of tables and delete the source?

I have a large table in MS SQL that I am having issues reading from while a third party application writes to it. My plan to resolve the problem is to move all of the data from one database and delete ...
3
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1answer
533 views

MongoDB -what's the safest and most efficient way to change from Master-Slave to ReplicaSet?

I now have two mongo servers with a Master-Slave configuration (all read-writes are done with the Master, the Slave is just a cold backup) serving a pretty demanding web app. I want to switch to ...
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2answers
8k views

Exchange 2010 don't see its PDC (same machine)

I have two 2008 R2 servers which should replicate AD. One si production server, second backup. On primary server is also Exchange 2010. There were plans about a year ago to install exchange to backup ...
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2answers
287 views

File synchronization between the web nodes

I'm looking for some bidirectional data synchronization between the web nodes. I've got two web servers with DNS load balancing. I'm using "lsyncd" at the moment however because of load balancing ...
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4answers
6k views

Is DRBD the only viable block replication solution for Linux?

I've found myself needing redundant storage at a block level. File-level replication (Gluster, GFS, etc) does not work for my use case. It looks like DRBD is the go-to solution for block ...
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1answer
134 views

Copy two remote folder into one local folder

I try to merge two folder (from remote Server) into one local directory. It is a deployment issue, on one Server there are two folders \server1\folder1 and \server1\folder2, now i try to merge both ...
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2answers
286 views

How many mongod instances should I run with a 2 server replicaset setup?

Currently I've got server A and server B running with the following mongod instances: Server A mongod server (usually PRIMARY) mongod arbiter Server B mongod server (usually SECONDARY) When ...
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5answers
3k views

How can I rebuilt MySQL replication without dumping the master?

Our MySQL database has grown fairly large, and I am running with master replication. Replication is broken. I am trying to rebuild the second master without freezing up the first master in doing a ...
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2answers
752 views

Possible to regularly export MS-SQL tables to another DB format on Linux without complete dumps?

We have a production server running SQL-Server, which holds our backend data, e.g., customer information, sales invoices etc. The nature of this data is that "old" data can change, e.g., a customer ...
5
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1answer
18k views

How to monitor DFSR backlog more efficiently than dfsrdiag

Is there a way to monitor the DFSR backlog in a manner more efficient than using dfsrdiag.exe backlog? I wrote a program that just slurps in the backlog count via dfsrdiag.exe backlog /smem:alpha ...
2
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1answer
130 views

raid with replication

We are planning to buy two servers which will going to host an SQL database(PostgreSQL). The second server will work as a live replication of the first database server (hot standby). The question I'm ...
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2answers
6k views

Active Directory Cross-Site Replication Speed - Should I select Preferred Bridgehead Servers?

I have 2 sites. Site1 with 2 DCs and Site2 with 1 DC. If I create a new user on Site1 the 2 DCs replicate the user instantly. The Site2 DC doesn't get the new user replicated to it until some time ...
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0answers
245 views

PostgreSQL 1 master, multiple slave replication over slow links

I have a current use case in which remote computers query a central PostgreSQL database over a internet connection (read-only). We would like to implement a "stand-alone" system for these terminals so ...
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4answers
508 views

Starting a branch office on the other side of the world

Going to cut right to the point on this question, as I'm after as diverse range of solutions as possible so don't want to effect any opinions with the question too much. Client is a UK based ...
3
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1answer
504 views

MySQL slave server restart

What's the secure/proper way of restarting the MySQl slave server. I need to reboot the machine in order to update the kernel and apply some configuration changes. I've tested it on my lab and ...
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0answers
196 views

DFSR: Break large replication group into multiple smaller replication groups?

Is there a way to break a very large replication group into smaller replication groups while avoiding a huge backlog while it re-syncs or verifies the files in each smaller replication group? I have ...
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2answers
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Windows DFSR - Changed replicated directory permissions and now have a 350,000 backlog for more than a week

Question: Is there a way to make this 350,000 file backlog complete faster? For nearly every file the only change was a change to the ACL for each affected file. Some files have changed content, ...
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1answer
1k views

dnslint and redadmin, why and when?

A pretty small query really - dnslint and repadmin - what really differentiates these tools in terms of troubleshooting replication? When and why would you use either one.
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3answers
194 views

Create a full replica of web server using different hosting company, is it logical?

Is it logical to create a full replica of our webserver, just on a less powerful machine, using other hosting provider ( just because its cheaper ). The idea is to have a plan B, in case main server ...
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1answer
218 views

Repadmin and DNScmd

A little query really in terms of the usage of Repadmin and DNScmd when forcing replication of DNS zones. I'm currently studying for my 70-640 (Active Directory Exam) and was wondering what the ...
0
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2answers
283 views

what is a good frequency for setting up snapshot replication in sql server 2008

My requirements: I have a publisher database from which I intend to replicate to a subscriber. Not all tables need to be replicated. Amount of data could be ~20-30GB. Given the above: is ...
0
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1answer
1k views

Mysql: What to do if a disc full happens on master OR slave and ther is no space left to binary logs

Recently I configured master-slave replication for my production with out considering all the user cases. I am started on all the possible use cases at hard ware level again to ensure we will be ...
0
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1answer
61 views

Is it possible that newer data is overwritten by old after MySQL replication slowdown?

I've set up master-master replication of 2 servers and in one of the tables I use REPLACE INTO to update the data in a table. Is it possible that a link between the 2 servers goes down, then server 1 ...
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1answer
226 views

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
967 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 ...
4
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2answers
262 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
1k views

MySQL to PostgreSQL replication

Is there way to replicate in near-realtime MySQL changes to equal PostgreSQL database?
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2answers
3k 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 ...
6
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2answers
860 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 ...
4
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3answers
245 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 ...