Protection avec des données répliquées
Les données sont répliquées à aprtir du disque local d'un serveur actif vers un serveur de backup.
Les données étant disponibles sur les deux serveurs, SteelEye contrôle les ressources applicatives et système et engage une procédure de restauration si défaillance.
Dans ce cas SteelEye tente automatiquement de redémarrer les services sur le même serveur. S'il n'y parvient pas, il lance les services sur le serveur de secours.
Au moment du basculement, les données ainsi que l'application Exchange sont prêtes à démarrer.
Le temps habituel d'interruption de service est de l'ordre de quelques minutes, en majorité prises par le démarrage d'Exchange.
Protection avec des données partagées
SteelEye contrôle en permanence les ressources et services d'Exchange. Quand une défaillance est détectée, une séquence d'actions est enclenchée aboutissant au redémarrage d'Exchange sur le serveur de secours. Dans ce cas, la base exchange est partagée entre les deux serveurs.
Les utilisateurs ne perçoivent pas qu'ils utilisent le serveur de backup et, à nouveau le problème est corrigé en quelques minutes.
Protection au travers d'un WAN
SteelEye réplique les données sur le serveur distant, via le LAN, en mode asynchrone, tout en monitorant les ressources d'Exchange.
En cas de sinistre, il active la copie de backup et démarre le serveur Exchange du site distant.
Le fonctionnalisté de réplication de données et de haite disponibilité de SteelEye sont totalement intégrées aux apllications et offrent :
au niveau local la réplication des données et la haute disponibilité du stockage de données partagées
les solutions de plan de Reprise d'Activité en environnements géographiquement dispersés.
En cas de défaillance, SteelEye tentera automatiquement de redémarrer les services sur le même serveur, et, si cela s'avère impossible, redémarera les services sur un serveur désigné du cluster. On pourra paramétrer l'ordre d'intervention de plusieurs serveurs successifs, en cascade.
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LifeKeeper® for Microsoft SQL Server
Key Features:
High Availability Clustering, Data Replication
· Supports all versions of Windows Server
and Disaster Recovery for Microsoft SQL Server
2000/2003 and SQL Server 2000.
SQL Server downtime costs companies around the world millions of dollars a
· Does not require identical hardware for
year. Technically-savvy IT organizations work to eliminate or lessen the
cluster nodes.
impact of both planned and unplanned downtime through the implementation
of real-time data replication, high availability clustering and disaster recovery
· Can build multi-node Many-to-One and
solutions.
Cascading clusters across any combination
of LAN and WAN. Not limited to 4 nodes.
SteelEye LifeKeeper for SQL Server is the industry's most comprehensive and
scalable solution for eliminating SQL Server downtime from either planned or
· Supports Active / Standby as well as
unplanned outages. With integrated data replication, high availability
multiple-SQL instance Active / Active
clustering and disaster recovery capabilities, LifeKeeper for SQL Server
configurations.
addresses all levels of uptime requirements, from local SQL database
replication, to local application failover, to complete disaster recovery of SQL
· Supports shared and replicated storage:
Server at a remote site.
databases can reside on shared SCSI,
single or multi-path Fibre Channel SAN, iSCSI or replicated volumes across a LAN
LifeKeeper constantly monitors the health of all pieces in the SQL Server
or WAN.
environment including servers, network connections, data volumes and SQL
Server processes. On detection of any problem, LifeKeeper initiates a recovery
· Combine with LifeKeeper Data Replication
action. This configurable action can include attempting to restart SQL Server
for tightly integrated data replication and
on the same server (a local recovery), migrating the SQL Server instance to a
high availability clustering from a single
backup server (a failover), or sending an alert to the SQL Server administrator
vendor.
so that the problem can be investigated. Through LifeKeeper's intuitive GUI,
administrators can manually move SQL Server instances among nodes to
· LifeKeeper Data Replication provides
eliminate the need for planned downtime due to maintenance. No longer does
asynchronous volume replication with a
applying service packs mean that SQL Server has to be unavailable.
single source system going to multiple
targets to provide both local and remote
LifeKeeper for SQL Server does not require that you use high-end versions of
copies of the database.
either Windows or SQL Server. There is also no requirement that all servers in
· Provides health and responsiveness
the cluster be identically configured. LifeKeeper is flexible so that you can
monitoring and failover of key SQL
deploy the HA cluster topology that makes the most sense for your business.
services:
This flexibility extends to the use of storage as well. With LifeKeeper, you can
- MSSQLSERVER
build a shared-nothing cluster using LifeKeeper Data Replication, or you can
- SQLSERVERAGENT
- Distributed Transaction Coordinator
deploy a shared-storage cluster using direct attached SCSI or Fibre Channel
- Microsoft Search
devices.
· LifeKeeper Extender lets you easily
LifeKeeper for SQL Server can also be extended across a WAN connection for
incorporate protection for any custom
full disaster recovery protection.
application.
Whether you need real-time SQL Server data backup, high availability
protection within a LAN or disaster recovery across a WAN, SteelEye LifeKeeper
for SQL Server meets your business needs. Backed by SteelEye Consulting Services
SteelEye offers a full range of consulting and professional services to assist customers in achieving high availability business objectives and to support the
deployment of SteelEye products. Services include High Availability Assessment, Solution Design, Configuration/
Deployment and Training. We are the HA Experts.
LifeKeeper® for Microsoft SQL Server
Data Replication for SQL Databases
SteelEye LifeKeeper Data Replication (LKDR) is designed to ensure that data is
always available. In a SQL Server environment, databases are replicated in
real-time from a local disk located on the active SQL Server to a local disk located on a backup server. Because LKDR can operate in either synchronous
or asynchronous mode, the backup server can be across either a LAN or WAN.
The recovery process from a local system failure is virtually immediate because data is available on a hot disk where it can be easily accessed and restored.
With the ability to do One-to-Many replication, multiple real-time copies can be
made to different locations to provide the highest possible data protection. Used alone, LKDR provides an efficient disk-to-disk data backup mechanism.
When combined with LifeKeeper High Availability clustering, it becomes a powerful component in an overall SQL Server protection solution. SQL Server High Availability Clustering SteelEye LifeKeeper for SQL Server monitors all components of a SQL Server
2000/2003 system--including servers, storage, network connections and SQL
Server processes--and initiates a recovery action on detection of a failure; it also provides a simple interface for manual movement of applications to
eliminate outages from planned maintenance. With support for both data replication and shared storage environments and
the ability to build Many-to-One clusters, LifeKeeper provides maximum flexibility in configurations which can be deployed. With LifeKeeper Extender, you can easily add protection for any application
resident on top of SQL Server. LifeKeeper will monitor and recover the
application with all SQL Server database dependencies taken into account. With LifeKeeper, the entire end-to-end application stack is protected. Disaster Recovery
The Disaster Recovery capabilities within SteelEye LifeKeeper for SQL Server
provide a complete and unmatched automated disaster recovery environment for protection against catastrophic failures at your primary data center. By
combining asynchronous data replication across a WAN with the monitoring and
recovery capabilities of LifeKeeper for SQL Server, a disaster recovery configuration for ultimate protection can be put into place easily. With automated and integrated data replication and failover to a remote site,
you can reliably replicate data asynchronously and reliably monitor critical
resources over a WAN. LifeKeeper will migrate SQL Server to the remote site only in disastrous events with a choice of full automation or a manually-
activated "panic button" which lets administrators make the final decision on
SQL Server recovery. Access to SQL Server is restored in minutes, rather than hours or days typically associated with disaster recovery operations.
About SteelEye Technology SteelEye, a Microsoft Certified Partner, is the leading provider of data and application availability
management solutions for business continuity and disaster recovery for Linux and Windows. The SteelEye LifeKeeper family of application-focused data replication, high availability
clustering and disaster recovery solutions are easy to deploy and operate, enabling enterprises of all sizes to ensure continuous availability of business-critical applications, servers and data. To complement its software solutions, SteelEye also provides a full range of high availability
consulting and professional services to assist organizations with the assessment, design and
implementation of solutions for ensuring High Availability within their environments. To contact SteelEye, visit our website at www.steeleye.com, or call
Within the US/Canada: 1.877.319.0108
International:
1.650.843.0655
Terms and product names used may be trademarks of and copyrighted by their respective companies and owners.
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