Data Migration


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Legacy PACS image data may be stored in online disk arrays (RAID / NAS / SAN), near-line sets of optical disks and tapes in robotic libraries, or offline shelf storage of tapes or disks. When any of the legacy data is in near-line or off-line storage, the data migration project contains an element of media handling services.

Legacy Hierarchical Storage Managers (HSMs)

For legacy PACS that use an HSM to manage the media, Laitek has automated scripts that invoke HSM functions to efficiently read data from storage volumes and transfer it to buffers in the migration server. Special care is taken with tape-based archives to read data in the order that it is written on the media, to avoid the severe performance impact and tape wear that results from random-access extraction of migration data. Migratek servers are configured with multi-terabyte disk buffers whenever near-line media are involved.

HSMs also manage backup of archived data on duplicate or triplicate media. Laitek handles the retrieval from secondary storage, interacting with data center personnel as necessary, when recovery from backup media is required.

Direct PACS-Controlled Robotic Libraries

Some legacy PACS do not use HSMs for media management, instead controlling robotic libraries directly from the PACS server software. In some such cases, Laitek can still use the robotic library to read the stored media. Otherwise, Laitek provides hardware to read shelf media, and the assistance of customer personnel is required to load the media into Laitek reader devices.

Shelf media

Some legacy systems, particularly cardiovascular and interventional systems, rely on large collections of CD or DVD shelf media for their archived data. Laitek provides a robotic reader device that inputs batches of 50 or 100 disks assembled and loaded by customer personnel.