| CLUSTERING |
Clusters allow for instantaneous automated failover from a primary to a secondary server, in only a few seconds without any loss of transactions written to disk. Our vendor provides a full suite of clustering solutions for the major database platforms (Oracle, MySQL and MS-SQL) as well as most filesystems. Depending on the application secondary cluster members may also be accessed in read-only mode for reporting, backups or replication. Clustering solutions either involve shared SAN storage or NAS- or DRBD-based solutions. Since both cluster members can be affected by a corrupt block device, we recommend that all cluster solutions include some form of replication.
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