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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Branch office replicated file system

I'm looking for something that can replicate file systems between multiple branch locations. Our file servers currently run CentOS 7. I feel like there has to be a better solution that what we're ...
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34 views

Postgresql streaming replication with restore_command for archived WAL files

I have a primary server that archives (and gzips) WAL files into /wal/archive/. At the moment, I'm attempting to set up a hot standby with streaming replication from a base backup. When starting up ...
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36 views

Connecting to a MariaDB server with master-master replication setup hangs randomly

I have a two server MariaDB master-master setup as documented on the DigitalOcean community page: https://www.digitalocean.com/community/tutorials/how-to-set-up-mysql-master-master-replication. The ...
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21 views

How to fix a messed up replication on MS SQL Server [migrated]

I restored a database from a backup. The database uses replication to publish to a different server. Assuming the database restore would break the replication, I tried to delete the replication and ...
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2answers
46 views

MS SQL Server 2 identical databases on different servers replication or mirroring to each other possible? [closed]

Hi: I have one free version of SQL Server 2012 express database running on Amazon AWS with 1 CPU and only 1 GB Ram . As you can see the CPU and RAM power are barely enough for my PHP scripts running ...
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1answer
51 views

How to deal with VHD for database storage in a multi VM setup in Azure

I've learned that to have the most available Windows Azure VM setup it's best to create availability sets. My setup would be to have an availability-set for 2 web-VM's and a set for 2-sql-VM's The ...
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1answer
40 views

Safe to demote & rebuild AD replica running exchange?

We have two Windows 2008 r2 servers. One is located in house which runs all domain logins, resources, file sharing etc. The second server is a AD replica which is remotely hosted at our Datacenter ...
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15 views

MariaDB replication- slave with high loadavg

We recently set a master-slave replication with MariaDB 10.1.12 on RedHat 6.7 fully patched. Master and slave are powerful Dell R730 with 2 RAID arrays- 1) 2 x 15k SAS drives for OS in RAID1 2) 4 x ...
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1answer
18 views

Hyper-V Replication & Large Machine Observations

I have Oracle Unbreakable Linux 6.5 which runs Oracle ERP application & Database it has three VHDs 80 GB , 600 GB and 120 GB on daily basis it creates RMAN backup approx 32 GB which stores on 120 ...
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1answer
20 views

MS SQL replication run only with system account

I'm trying to configure a new replication with SQL Server 2012 I configured the distribution While configuring the publication, it asked for a user to run the snapshot agent. I set a strong user ...
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1answer
24 views

vSphere / SRM replication not respecting priority groups

I'm in the process of demoing VMware's SRM. The install is good and I can easily run a restore for a single machine. I'm developing a recovery script for a single application is spread across ...
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1answer
44 views

How do i measure redis replication delay?

Which of these can be considered to monitor replication delay ? Redis_master_repl_offset, Redis_master_last_io_seconds_ago , Redis_slave_repl_offset
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27 views

Gluster for replication/propagation

Say I have a bunch of servers that access a gluster mount to serve files via http. Files are sourced internally, and are copied from an internal server to the gluster mount on one of the download ...
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2answers
110 views

How to replicate files between two separate apache machines in bidirectional

How to replicate /var/www/html/ between two separate machines which has separate hard disk storage running Apache web servers. I was planning to setup load balancing between these two Apache servers ...
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1answer
66 views

WSREP: Bad value for 'socket.ssl_key'

I am attempting to initialize a new MariaDB Galera cluster with SSL-encrypted replication. I have followed this guide to the letter, specified different details for CA, Server, and Client ...
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62 views

MySQL replication - invalidating query cache entries (table)

We lately mved to MySQL V5.5 on CentOS release 6.7 with master and 2 slaves. Since then the replication process lags a lot behind the master with the line in the process list of: invalidating query ...
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33 views

Adding network-fault tolerance to drbd or drbd alternatives

I've been working with drbd for about a year now, and at this point I'm tearing my hair out in frustration. Every time there is a network fault (something that is disappointingly common in the ...
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1answer
42 views

Sync two Non-Enterprise SQL Servers [closed]

We have a SQL Server 2005 in one of our company's locations. Since DB calls from other locations are very slow, we would like to set up another SQL Server on the other location and keep the server ...
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43 views

PG, Redis, and Elasticsearch replication for 2 distant metal servers

After years of running a web app on ~15 separate VPS, I'm switching to a single physical server*. App uses 3 DBs: Postgres, Redis, and Elasticsearch, and can update to latest version on all 3. ...
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1answer
37 views

Replication issue on all 3 domain controllers

We have 3 domain controllers in server 2012. Replication is failing miserably. Repadmin /replsummary dc1 rpc server not available dc 2 rpc server not available dc 3 "Insufficient attributes were ...
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64 views

Unable to create index on solr, when using Zookeeper

Evening, I've created a what I believe to be a simple SOLR cluster, with Zookeeper (external binaries instead of the embeded). For simplicity, this cluster is: Master: SOLR1 Slave: SOLR2 Both ...
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38 views

Unable to connect to MASTER: Resource temporarily unavailable : Connecting to MASTER no:0

I'm currently working on simle active stand/by Redis clustering for query caching with Keepalived. The problem I'm facing is when I shutdown&start(restart) the host1 server for testing, it ...
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1answer
353 views

Deleted Domain System Volume. How do I recreate it; I have no backups

As the title suggest I am basically screwed. Before all this happen; I had one problem: My group policies were not replicating from PDC to other DCs. I have three Dc's in production. As you can ...
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2answers
34 views

Moving mysql slave

I am trying to move MySQL slave from old pc to new. Original slave is MySQL version 5.6.12 same as new slave(MySQL is part of wamp 2.4). Replication works fine at old machine. But when I stop slave, ...
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1answer
22 views

mysql master to master replication with one slave

I have 3 servers Server A master to Server B Server B master to Server A and Server C Server C slave to Server B When I add table to Server A, it replicated on server B but not in Server C When I ...
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1answer
16 views

// , Can I change the MASTERAUTH value on a running Redis instance in a Redis Cluster?

// , According to http://redis.io/topics/security, I can set a requirepass value, for example, requirepass foobared, in the Redis configuration files. However, I don't want this in my configuration ...
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2answers
97 views

Active Directory replication target principal name incorrect

I have a small 2 DC domain using Win 2008 R2 machines. Recently, one had to be restored using backup exec system recovery. Now the two are failing replication. I have ran DCDIAG on both (see below) ...
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1answer
307 views

Kubernetes Update Pods in Replication Controller behind Service

We have a deployed API in Kubernetes. The API is deployed via replication controller to pods and a managing rc. I would like to update the configuration to the API pods using rolling-update. I can do ...
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1answer
345 views

Can not start PostgreSQL replication resource with Corosync/Pacemaker

I'm setting up a PostgreSQL replication on two servers (CentOS 6.5) with HA by Corosync/Pacemaker. My software info: postgresql91-9.1.19-1PGDG.rhel6.x86_64 ...
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17 views

Merge and transactional SQL replication…database empty (SQL 2005)

Firstly, let me just say that I'm a novice at SQL in general and this might be an easy fix for someone reading, but I've been unable to find anything that would explain or help my issue online. If ...
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1answer
140 views

elasticsearch not creating replica shards

I am banging my head for the past two days on this one. I have setup an elasticsearch cluster of two nodes. The configuration of each node is pretty simple: node.name: "server1" ...
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11 views

Planning For Growth with GlustreFS

I'm looking into GlusterFS and want to be able to add capacity one storage node at a time. I want to mirror data on two nodes at all times, and keep maintenance simple. I also want the cluster to keep ...
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49 views

both test lab Domain controllers need initial synchronisation

Im trying to setup a test lab for our 2008R2 AD environment but am having trouble getting the domain controllers to start. If I just start the PDC with all FSMO roles (DC01) it gives an error saying ...
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1answer
56 views

How to replicate domains from different forests

I have 2 domains each in a different forest with transitive trust... Now, I am asked to do replication between them. My question is.. is that possible? if so how can I do that? any clue? I've made ...
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1answer
71 views

Windows Active Directory backup to a file

How can i take a complete backup of windows Active Directory into a single file and is it possible to restore this AD backup to another server? I cannot use active directory replication now, because ...
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1answer
26 views

Server 2008 R2 Replication Issue

I am trying to figure out why my Server 2 which is a domain controller is getting an error saying "Access Denied" when I am trying to access group policy management. I have checked and it is giving ...
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1answer
60 views

What happens to read/write operations during automatic client failover in MongoDB Replication

We have setup a 3 node replication set configuration for MongoDB. I want to know what happens to read/write operations during primary switchover. To be more explicit, few read/write operations were ...
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1answer
73 views

DNS Active Directory Zone Replication Scope (Forest vs Domain)

When I create a new Domain Controller with dcpromo then the wizard will also add a DNS Role to the server because the first domain controller must be the global catalog server for the forest. After ...
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1answer
40 views

Two folders synchronization (1 way sync), one in intranet the other one in extranet [closed]

I have one server in intranet (joined to domain, accessible via domain account) and the other one in extranet (not joined to domain, accessible via hopping station using a local account). Shared ...
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1answer
27 views

Are there any two-bay hardware bit/block level replication devices (perhaps RAID-1)? [closed]

Here's what I'm hoping to do: Have two drives in a hardware bay that can be pulled from the front without dissassembly Read and write to it as a single (NTFS) disk Be able to pull either drive and ...
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2answers
91 views

MongoDB automatic failover between 2 data centers

If I deploy a MongoDb replica set across only 2 data centers, if one entire data center fails, can there be automatic failover to the other data center? Consider the situation where 1 data center has ...
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0answers
85 views

DFS-style Replication for Samba?

I've been snooping around here for a while, and it looks as if glusterfs might be the answer to my question. However, I am fairly new to this, so a sanity check would be much appreciated! My setup is ...
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13 views

Data is re-inserted when replication is done

I have a transactional publication done between two databases on different Virtual machines connected with a network. I noticed that for some reason Every time replication is happening (which is every ...
2
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1answer
167 views

SQL Server Replication only for Enterprise Edition? Does it require Enterprise on both sides? Other solution?

My situation: I've been looking for an option of data replication for my SQL Server (I'm not expert on it, I should say it - neither on English Language). I've seen a few options, like Log Shipping ...
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18 views

Testing VMware replication on the same storage

We have two sites setup with VMware Site Recovery Manager (SRM) using VMware Replication to synchronize VMs. I need to validate the procedure for the site switch-over but I can use only one site. My ...
0
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1answer
85 views

OpenLDAP: Why would you ever use refreshOnly for replication?

I'm reading about OpenLDAP replication and I don't understand why you would use refreshOnly mode vs. refreshAndPersist mode. I've tried to do some searching online, but wasn't able to find any ...
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200 views

Linux LVM replicated Volumes

I am migrating storage arrays, on two sites.The DR site has synchronous block replication from main site that will be cut during the migration, however once the volumes are migrated the replication ...
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29 views

Asynchronous database replication solution PostgreSQL [closed]

We have an application Client (Android) -> API (PHP) -> Database (PostgreSQL) that controls flow of people on big events (clubs, wedding parties, academic meetings etc...), that runs over the ...
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2answers
332 views

Why does MySQL Galera not replicate the user table?

I am running a 3 node MySQL 5.6 Galera Cluster. Everything is in sync and looks fine, but as I just found out the user table was not in sync. One particular user was not present on the other nodes ...
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164 views

Why is it not possible to mount a replicated gluster volume with one Gluster server?

I am running 2 glusterd on individual machines connected by private network. It apears that I can only mount the bricks if both deamons are up, otherwise it failes. As I am pretty new to glusterfs, ...