Data Director
Real-time file system replication is traditionally implemented by distributing updates of a virtual block device to several physical hard disks. QStar’s Data Director™ provides solutions to protect archive data in this way by adding Disaster Prevention features to its HSM software with the integration of data replication thru real-time mirroring. By taking the security of a transaction logging cache, a system independent disk format and adding event-based mirroring, QStar Data Director provides the means to both manage and protect your corporate archives. Data Director supports synchronous mirroring within or between storage libraries with full load balancing, immediate failover and automatic re-synchronization when a failed device is brought back on-line.
All the Features of QStar HSM
By incorporating all of the standard features found in QStar HSM, Data Director’s proven algorithms ensure the accessibility and the security of the data. The most frequently used data and all directories for mounted volumes are held in a high performance magnetic disk cache to ensure unsurpassed on-line archival performance.
Mirroring
Multiple logical volumes may be combined to create a Mirror Set. With data mirrored continuously at a transaction level, both the primary and the secondary logical volumes are always exact duplicates. The logical volumes may be in different jukeboxes and in different locations on a LAN or even a worldwide WAN, and may even be of different archival media types.
Hot Standby
In a Mirror Set, one volume automatically becomes a Hot Standby for the other volume. QStar software will sense if a volume becomes unavailable and continue to service read and write requests to and from the remaining volume. The result is increased productivity through reduced storage down time.
Automatic Re-Synchronization of Data
In the unlikely event of a jukebox failure, data migration to the remaining volume is still available to ensure continued data security. When returned on-line, the previously unavailable volume is automatically re-synchronized ensuring both volumes continue to accurately mirror the data.
Load Balancing
In environments where user requests exceed the throughput capability of the jukebox, and where multiple jukeboxes are available, QStar software automatically services read requests from both mirrored devices. With Load Balancing, users maintain fast data access at peak periods.
|
Data Director
|
Qstar 
