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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Postgres: Replicating over ssh at specific time frames

Can someone help me with the most common stable replication mechanism for postgres that I can run at specific times of a day(know it sounds weird) postgres that can run over ssh? Over ssh is ...
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2k views

KVM Hosting: How to efficiently replicate guests

I have three KVM servers each with 1 guest VM, running directly on it's local storage, (so they are essentially getting a dedicated box worth of computing power each). In the event of a host failure I ...
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3answers
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New Domain controller is having trouble replicating from an existing DC, 13508 Event ID for FRS

This question is related to a previous one I asked regarding backing up Domain Controllers and RODC's. Basically I am making some changes in regards to the DC's in my network. I am looking to add a ...
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1answer
523 views

DFS trying to replicate back to source folder?

I'm not very familiar with how DFS works, and since someone else administers the servers in question I don't know what the DFS setup looks like. I'm just wondering if something is possible. ...
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3answers
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How do I configure active directory when Sql Server 2012 is using a Virtual Account?

I'm getting the following event log entry from Sql Server 2012: SQL Server Scheduled Job 'Replication agents checkup' - Status: Failed - Invoked on: 2012-08-04 10:00:00 - Message: The job failed. ...
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2answers
352 views

mysql master slave “table already exists” but table not exists

I have 1 master mysql process, and 2 slave. Today on both slaves i see : Error 'Table 'bgbilling.contract_status_balance_dump' already exists' on query. Default database: 'bgbilling'. Query: ...
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1answer
199 views

maakit: mk-table-sync issue with index

Trying to re-sync a slave, I run into troubles with some of my tables which do not have a auto-increment primary index, but a primary unique ID (not auto-increment). I run the re-sync with ...
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1answer
157 views

System Requirements of a write-heavy applications serving hundreds of requests per second

NOTE: I am a self-taught PHP developer who has little to none experience managing web and database servers. I am about to write a web-based attendance system for a very large userbase. I expect ...
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1answer
296 views

Is there an async FUSE filesystem for replication?

I have a low-power VIA x86 PC with one SATA port. I want to backup special files (ie: /var) from the SATA drive on this port onto a USB flash disk, but I don't want a RAID1 or fully-synchronous ...
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1answer
216 views

SQL Server Broker Service with Active - Active replication in place

We currently have two datacenters in Active - Active mode and using SQL replication between the two datacenters (with a small delay). I'm developing a new process that will use SQL Server Broker ...
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2answers
711 views

Best PostgreSQL replication solution that minimizes network costs

I'm looking into PostgreSQL replication solutions. I know two varieties of these solutions Low level - which involves streaming log-shipping, hot-standby features available in PostgreSQL 9.x High ...
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3answers
3k views

MySQL Replication Performance

I'm having a serious issue with MySQL 5.5 replication performance between two machines, mostly myISAM tables with statement based replication. The binary logs and mysql data directory are both located ...
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1answer
99 views

How does a replicated DC handles w32tm changes?

We have 2 replicated W2K8R2 DC's. I had updated one (DC1) with w32tm to get manual updates from asia NTP. Everything syncs correctly. My question: (In order to learn): How does this propagates to ...
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1answer
338 views

Queries Stuck on the 'Connect' Command

So, little back story. We have a master-slave set-up and multiple times per day, we see something like this on the slave database, trying to replicate whats come from the master Id User ...
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1answer
414 views

Monitoring MySQL replication through HAProxy Xinetd service

I have have set up MySQL multi-master replication with HAProxy as a load balancer following Alex Williams' tutorial found here; ...
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1answer
955 views

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 ...
0
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1answer
198 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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0answers
203 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
1k 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 ...
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1answer
3k 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
79 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
377 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
231 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 ...
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1answer
206 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
197 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
268 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
78 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
853 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
893 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
414 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
168 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
11k 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 ...
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1answer
118 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
151 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
350 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
98 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
436 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
4k 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
222 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
3k 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 ...
0
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1answer
111 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 ...
2
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2answers
232 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
2k 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
484 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 ...
4
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1answer
8k 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
121 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
4k 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
169 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 ...
16
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4answers
474 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
253 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 ...