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  • SAN based Snapshots and Disaster Recovery

    - by Nasa
    I wanted to know if anyone has has any expirience of using SAN based snapshots and replication between SANs for disaster recovery. My main worries are around databases and applications like Exchange being recovered from a snapshot, has anyone tested this at all? I am looking at CDP products, but at looking at bare minimum requiresments based on snap shots.

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  • Does DFSR replicate shadow copies?

    - by Jeff Sacksteder
    There a a few questions related to using DFSR and Shadow Copies together, but none that indicates if Shadow Copies replicate or not. Meaning, if I have a a pair of DFS replicas with Shadow Copies on Server-A, can I revert that file to a previous version on Server-B? If so, will that reversion be replicated back to Server-A? I suspect not- that VSS is a local NTFS feature and outside the scope of replication, but I cannot verify that myself at the moment.

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  • Can a BIND server be a slave to a non-BIND master DNS server?

    - by Michael Neale
    If I have a master DNS that is not bind - can bind still slave to it? (ie does it use the DNS protocol or something else?). Kind of related - but do people still do this or do they use some other form of data replication to keep DNS records in sync to the slaves (ie file/database copying)? I would like to have the slaves refreshed as fast as possible so I am thinking normal slaving with is expiry/poll based might not be optimal?

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  • What Are Some Good Open Source Alternatives to Active Directory?

    - by Laz
    I'm looking for a good open-source alternative to active directory that can handle: Authorization/Authentication Group Policy Replication and Trust Monitoring In addition, are there any consolidated systems out there that handle these responsibilities? Edit: Since a lot have asked for more details, I am trying to offer a service setting up an infrastructure for organizations, hardware/software setups, right now I am looking at a Linux stack, both desktops and servers, however a hybrid stack is possible, and I am investigating alternatives.

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  • How to set up Heartbeat to run a service only at one node

    - by Jon Skarpeteig
    I have two Ubuntu 12.04 servers, which run mysql in a master-master setup, with mmm as manager. How can I set up heartbeat to make sure that mmm only runs at one node at the time? *Edit to explain more clearly My setup: ---------VIP (10.0.0.123)------ | | Node1 Node2 Where bot Node1 and Node2 run: Mysql Multi-Master Replication Manager for MySQL (mmm) Heartbeat I only want a single write enabled mysql node, and I can only have one mmm running at the time, else I'll get collision between the managers.

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  • DFS "clobering" files

    - by Badger
    We have DFS setup using the DFS Management Administrator Tool. I turned on replication in the Distributed File System Administrator Tool as well and this morning we lost tons of files from that share. Please explain to me why this was wrong and if there is anything that can be done to repair it. (No, we don't have backups. We have some shadow copies, but those were deleted as well. We have been using DFS as its own backup)

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  • Replicate From OpenDJ to OpenLDAP?

    - by Joel K
    I am considering retiring some of our older OpenDJ LDAP servers and replacing with OpenLDAP. (seems to be more widely supported) I am wondering if it's possible to replicate directly from OpenDJ to OpenLDAP as an interim solution to remove the OpenDJ slaves and then flip the master over later. Is LDAP replication implementation specific or more general? I guess I'll have to just go give it a try, but I was looking for advice from someone who's been down this road.

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  • Partial sync of Mysql databases on two remote computers

    - by Beck
    Does mysql replication supports delayed sync if remote slave server is OFF? For example I want to make my developing server have a fresh copy of databases each morning. It should be partial sync, not full copy of databases each morning. And synchronization should be only ONE way, not duplex, to avoid deleting something of master server. What utilities are out there or native functionality of mysql itself? Thanks!

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  • Need help with setting up MS-SQL on EC2.

    - by Hareem Haque
    I have a large MS-SQL database that i need to send to the aws cloud. The issue is how do i persist my sql data and how to setup MS-SQL cluster using windows AMI. The real issue is that for replication i need to use the private ip's of the instances. However, these ip's are always dynamic and will change on server launch. Any ideas on how i can get rid of this problem. I really appreciate your help Best Regards Hareem Haque

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  • Uneven Cassandra load

    - by David Keen
    Should a three node Cassandra cluster with a replication factor of 3 have the same load value for all three nodes? We are using a random partitioner and NetworkTopologyStrategy. Nodetool ring shows equal values for "Owns" but unequal values for "Load". Load Owns Token 113427455640312821154458202477256070484 16.53 GB 33.33% 0 14.8 GB 33.33% 56713727820156410577229101238628035242 15.65 GB 33.33% 113427455640312821154458202477256070484 Running nodetool repair and cleanup on each node brought the load a little closer but it still seems quite unbalanced. Is this considered normal?

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  • MySQL HA and Magento DB

    - by Raj
    Is it possible to use MySQL cluster for Magento DB? I have Web app developed in Magento E-commerce platform and I want to make DB highly available using the MySQL cluster. Magento supports only InnoDB database engine and MySQL HA uses it's own engine NDB. The Percona XtraDB Cluster, Does it change the InnoDB storage engine to XtraDB? Can I rollback to the MySQL native replication from Percona XtraDB Cluster?

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  • Shared storage setup for Windows

    - by KarmaVille
    This is a n00b question. I want to setup a SAN that will be used as shared storage between multiple Windows 2008 R2 servers. By shared storage, I mean the files can be seen by all servers. How do I do that? Is it possible to implement this without a dedicated Windows file server? (I don't want replication). I'm doing this so that I can setup: http://activemq.apache.org/shared-file-system-master-slave.html

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  • Issues related to storing photos in Active Directory?

    - by Joe_Jones_442Hemi
    Are their any known issues with storing employee photos in AD provided you store them in the compliant sizes and formats? Is there a critical mass that you break or could corrupt AD databases? I'm trying to understand some of the server teams deep concerns with our intent to store employee photos in AD... they fear it will corrupt the database or replication issues will occur globally, etc. We're about a 3,000 employee company.

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  • Is there a way to replicate a very large file shares in real-time?

    - by fsckin
    I have an hourly cron job that copies about 40GB of data from a source folder into a new folder with the hour appended on the end. When it's done, the job prunes anything older than 24 hours. This data changes very often during work hours and is on a samba file share. Here's how the folder structure looks: \server\Version.1 \server\Version.2 \server\Version.3 ... \server\Version.24 The contents of each new folder compared to the last one usually doesn't change very much, since this is a hourly job. Now you might be thinking that I'm an idiot for setting dreaming this up. Truth is, I just found out. It's actually been used for years and is so incredibly simple, anyone could delete the ENTIRE 40GB share (imagine that dialog spooling up... deleting thousands and thousands of files) and it would actually be faster to restore by moving the latest copy back to the source than it took to delete. Brilliant! Now to top this off, I need to efficiently replicate this 960GB of "mostly similar" data to a remote server over WAN link, with the replication happening as close to real-time as possible -- think hot spare, disaster recovery, etc. My first thought was rsync. Total failure. Rsync sees it sees a deletion of the folder that is 24 hours old and the addition of a new folder with 30GB of data to sync! I also looked at rdiff-backup and unison, they both appear to use similar algorithms and do not keep enough meta-data to do this intelligently. Best thing that I can find "out of the box" to do this is Windows Server "Distributed Filesystem Replication" which uses "Remote Differential Compression" -- After reading the background information on how this works, it actually looks like exactly what I need. Problem: Both servers are running Linux. D'oh! One approach to this I'm looking at is this, say it's 5AM and the cron job finishes: New Version.5 folder arrives at on local server SSH to remote server and copy Version.4 to Version.5 Run rsync on the local server pushing changes to the remote server. Rsync finally knows to do a differential copy between Version.4 and Version.5 Is there a smarter way to replicate Samba shares as close to real-time as possible? Anything out there that does "Remote Differential Compression" on Linux?

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  • ldap export and import

    - by Jure1873
    Is it possible to export all the data inside openldap for example using ldapsearch or some other tool to a (ldif?) file and then import everything on another server and put this in a script that would be run every day. So that I could use the other one as a backup when the first/master server is not available? I have full access to the first/master server, but I can't modify it's configuration so I think I can't set up replication.

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  • what are the difficulties of operating system multithreading?

    - by ghedas
    I am reading a book that compares two ways of implementing threads, Middleware Threads and OS Threads. I have a question about these sentences: "A difficulty of operating system multithreading, however, is performance overhead. Since it is the operating system that is involved in switching threads, this involves system calls. These are generally more expensive than thread operations executed at the user level, which is where the transactional middleware is operating."

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  • Best practices for sending automated daily emails from web service

    - by Tauren
    I am running a web service that currently sends confirmation emails out to new users via the gmail smtp servers. As I'm only getting a few new users each day, this hasn't been a problem. I've recently added new features to the webapp that will require a customized message to be sent out to each user every day. Think of this as similar to the regular messages LinkedIn sends out that give you a status report on the activity in your network. Every user's message will be different. With thousands of users, this means thousands of unique messages will be sent each day. Edit: I've since found that these types of email are called "transactional or relationship messages". Spamtacular has a good article on differentiating between marketing and transactional email. I don't think using gmail's smtp servers will cut it anymore, but I don't know that for sure. I don't know what gmail's maximum outgoing messages per account is (it might be 100/day), but they limit outgoing mail to 500 recipients per message. I'm not sending a single message to 500 recipients, but I'm going to be sending 1000's of customized messages with each recipient getting one per day. I'm interested to learn any best practices for doing this (especially for Java-based webapps). Here are some of my thoughts and concerns on it: Should I set up my own outgoing mail server? If I do this, it seems like I'll have all sorts of other issues to worry about, such as preventing mail server abuse, monitoring bounces, allowing ways to opt-out of emails, etc. Are there any tools or services to help with this? Maybe something like OpenEMM or a services like MailChimp? But those seem focused more toward email marketing campaigns. I don't think I should have the webapp itself handle sending emails as it currently is for new user signups. I'm thinking I should setup a separate messaging server that can access the same backend/datastore as the webapp. Thoughts on this? Should I consider setting up some sort of message queueing service to help with this, such as JMS, RabbitMQ, ActiveMQ, etc.? Do I need to provide users a way to opt-out? Do I need to flag these as bulk messages? I don't really consider these email marketing messages, but I'm unsure what is considered appropriate or proper netiquette. Any advice is appreciated. I'm also very interested in open source tools or web services that simplify things and could help me to ramp up as quickly as possible. Thanks!

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  • Spring transaction demarcation causes new Hibernate session despite use of OSIV

    - by Kelly Ellis
    I'm using Hibernate with OpenSessionInViewInterceptor so that a single Hibernate session will be used for the entire HTTP request (or so I wish). The problem is that Spring-configured transaction boundaries are causing a new session to be created, so I'm running into the following problem (pseudocode): Start in method marked @Transactional(propagation = Propagation.SUPPORTS, readOnly = false) Hibernate session #1 starts Call DAO method to update object foo; foo gets loaded into session cache for session #1 Call another method to update foo.bar, this one is marked @Transactional(propagation = Propagation.REQUIRED, readOnly = false) Transaction demarcation causes suspension of current transaction synchronization, which temporarily unbinds the current Hibernate session Hibernate session #2 starts since there's no currently-existing session Update field bar on foo (loading foo into session cache #2); persist to DB Transaction completes and method returns, session #1 resumes Call yet another method to update another field on foo Load foo from session cache #1, with old, incorrect value of bar Update field foo.baz, persist foo to DB foo.bar's old value overwrites the change we made in the previous step Configuration looks like: <bean name="openSessionInViewInterceptor" class="org.springframework.orm.hibernate3.support.OpenSessionInViewInterceptor" autowire="byName"> <property name="flushModeName"> <value>FLUSH_AUTO</value> </property> </bean> <bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="myDataSource" /> </bean> <bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean"> <property name="useTransactionAwareDataSource" value="true" /> <property name="mappingLocations"> <list> <value>/WEB-INF/xml/hibernate/content.hbm.xml</value> </list> </property> <property name="lobHandler"> <ref local="oracleLobHandler" /> </property> <!--property name="entityInterceptor" ref="auditLogInterceptor" /--> <property name="hibernateProperties" ref="HibernateProperties" /> <property name="dataSource" ref="myDataSource" /> </bean> I've done some debugging and figured out exactly where this is happening, here is the stack trace: Daemon Thread [http-8080-1] (Suspended (entry into method doUnbindResource in TransactionSynchronizationManager)) TransactionSynchronizationManager.doUnbindResource(Object) line: 222 TransactionSynchronizationManager.unbindResource(Object) line: 200 SpringSessionSynchronization.suspend() line: 115 DataSourceTransactionManager(AbstractPlatformTransactionManager).doSuspendSynchronization() line: 620 DataSourceTransactionManager(AbstractPlatformTransactionManager).suspend(Object) line: 549 DataSourceTransactionManager(AbstractPlatformTransactionManager).getTransaction(TransactionDefinition) line: 372 TransactionInterceptor(TransactionAspectSupport).createTransactionIfNecessary(TransactionAttribute, String) line: 263 TransactionInterceptor.invoke(MethodInvocation) line: 101 ReflectiveMethodInvocation.proceed() line: 171 JdkDynamicAopProxy.invoke(Object, Method, Object[]) line: 204 $Proxy14.changeVisibility(Long, ContentStatusVO, ContentAuditData) line: not available I can't figure out why transaction boundaries (even "nested" ones - though here we're just moving from SUPPORTS to REQUIRED) would cause the Hibernate session to be suspended, even though OpenSessionInViewInterceptor is in use. When the session is unbound, I see the following in my logs: [2010-02-16 18:20:59,150] DEBUG org.springframework.transaction.support.TransactionSynchronizationManager Removed value [org.springframework.orm.hibernate3.SessionHolder@7def534e] for key [org.hibernate.impl.SessionFactoryImpl@693f23a2] from thread [http-8080-1]

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  • transactions in MS Access

    - by arcticpenguin
    Let's say I have the following code in a form that is triggered on some click event. DoCmd.SetWarnings False DoCmd.OpenQuery "AddSomeStuff" DoCmd.OpenQuery "UpdateSomeOtherStuff" DoCmd.OpenQuery "DeleteABunchOfCrap" DoCmd.SetWarnings True Can I assume that the three update queries I executed (in SQL Server) are not transactional in that they are run is separate transactions?

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  • Good working habits to observe in project development?

    - by Will Marcouiller
    As my development experience grows, I see fit to stick to best practices from here and there to build somehow my own working practices while observing the conventions, etc. I'm currently working on a project which my goals is to graduate the security access model from an environment's Active Directory to another environment's automatically. I don't know for any of you, but as far as I'm concerned, I meet some real difficulties sticking to only one way, then develop. I mean, I learn something new everyday while visiting SO, and recently wanted to get acquainted with generics. On the other hand, I better know the Façade pattern which proved to be very practical in transactional programming in process systems. This seems to be less practical for desktop application as there are plenty of variables to consider in a desktop application that you don't have to care in transactional programming, as you're playing only with information data. As for my current project, I have: Groups; Organizational Units; Users. Which are all considered an entry in the Active Directory. This points out to be a good candidate for generics, as also approached this way by Bart de Smett's Linq to AD on CodePlex. He has a DirectorySource<T>, and to manage let's say groups, then he instantiate a source with the proper type: var groups = new DirectorySource<Group>(); This seems to be very a good way of doing. Despite, I seem to go from one pattern to another and I don't seem to be able to strictly stick to one. While I'm aware that one must not stay with only one way of doing, since each pattern statisfies certain advantages, while also illustrating disadvantages under some usage conditions, I seem to want to develop with both patterns having a singleton Façade class with the underlying factories which represent the sub systems: GroupsFactory; UsersFactory; OrganizationalUnitsFactory. Each of the factories offers the possible operations for their respective entity (group, user, OU). To make a very long story short, I often have plenty of ideas while developping and this causes me some trouble, as I go from an idea to another feeling completely lost after a while. Yet I understand the advantages and disavantages, I have no trouble choosing from one pattern to another depending on the situation. Nevertheless, when it comes to programming itself, if I'm not part of a team, I feel sometimes like I can't do anything good. That is, because I can't stand not doing something "perfect" the first time. The role I play within the project is both: the project manager and the programmer. I am more comfortable in the project manager role, architectural role, analytical role than the developer's. Has any of you some good habbits to observe in project development? Thanks to you all! =)

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  • Rolling back a transaction in a Grails Service

    - by UltraVi01
    I have been updating all my services to be transactional by using Grail's ability to rollback when a RuntimeException is thrown in the service. I have, in most cases, doing this: def domain = new Domain(field: field) if (!domain.save()) { throw new RuntimeException() } Anyways, I wanted to verify that this indeed will rollback the transaction... it got me thinking as to whether at this point it's already been committed.. Also, if not, would setting flush:true change that? I am not very familiar with how Spring/Hibernate does all of this :)

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