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How IMS High Performance Image Copy works


IBM® IMS™ High Performance (HP) Image Copy for z/OS® creates image copies which are one of the key resources involved in recovering IMS databases. It supports several different types of image copying and both IBM® and non-IBM fast replication storage processing solutions. It interfaces with the IMS command processor to eliminate the need to stop and restart the IMS database. In addition to image copying the IMS database, IMS HP Image Copy allows copies to be made of the IMS database data sets.

IMS batch and concurrent image copies

IMS HP Image Copy can create “batch” image copies or “concurrent” image copies. A batch image copy is created when the IMS database is taken offline with a /DBR or /DBD command or stays online with the IMS DB QUIESCE command. A concurrent image copy is created while the IMS database is still available for updating. A concurrent image copy requires the IMS archived log data sets for recovery as updates may have occurred during the time when the image copy was created.

Fast replication support

IMS HP Image Copy supports fast replication storage processors from IBM, EMC and Hitachi. With IBM, the tool invokes IBM FlashCopy®. With EMC, the tools uses the EMC TimeFinder support. With Hitachi, the tool invokes the FlashCopy support provided by Hitachi Emulation software. These storage processors allow image copies to be taken quickly by managing the copying of the data at the storage processor level.

Statistical reports

IMS HP Image Copy generates process summary reports during image copying processing. These reports keep a record of image copies created and all reports are stored in the IMS Tool Knowledge Base (ITKB) repository for centralized viewing and historical analysis.