With respect to extracting data out of an optical storage library, the manner in which many jukebox management applications wrote data to media stored in the device (randomly vs. sequentially) often results in migration projects taking many months to complete, even for small migration jobs.
Mapping network drives to an optical library and new target device, and issuing “copy-and-paste” operations or writing a command-line script that executes a series of copy commands, will cause a behavior within the library known as “thrashing” which occurs when media are constantly swapped in and out of drives to retrieve only a small number of files during each swap interval.
As the number of files and physical pieces of media increase, thrashing will have a significant impact on the time to complete a migration effort, as well as place a severe strain on the library robotics and optical drives, thereby increasing the likelihood of a device failure at some point during the migration.
Migrating Data and Regulatory Compliance
In addition to reduced performance and device failure risks associated with the “copy from a mapped drive letter” method of migrating data, organizations may face legal risks when the data being migrated is subject to regulatory compliance, or is involved in legal discovery and litigation.
When dealing with regulatory compliance issues, simply moving data from a legacy storage device to a new storage device does not guarantee authenticity of the files, even if they were stored on WORM media and are being moved to WORM media.
ONEPASS Data Migration Software
ONEPASS Data Migration Software was specifically designed to aid with the extraction of data files from optical disk libraries in the most efficient manner, with the goal of maximizing performance, minimizing downtime due to device failure, and maintaining chain-of-custody for every file migrated to the new device.
To eliminate thrashing of optical library robotics, the intelligent, media-aware architecture of ONEPASS data migration software organizes file recalls such that an entire side of a media is read sequentially in one pass, thereby optimizing performance and reducing the migration effort by a factor of 50 times or greater.
To provide continuous access to data during a data migration job, ONEPASS allows the administrator to assign system resources between access and migration, ensuring that business and IT requirements can be continually met.
As part of a “data cleansing” process during a data migration job, ONEPASS provides the ability to selectively include or exclude files, folders, and sub-folders, and migrates only the required subset of data, thereby reducing migration times and required storage capacity on the new target device.
Regarding chain-of-custody to meet regulatory compliance, every step of the migration process is captured and logged, beginning with selecting the source data, and ending with post-migration verification of file content on the target system.
Using a 160-bit SHA1 cryptographic process, ONEPASS establishes a unique content ID for each file, and once the file is migrated, it is then recalled from the new storage device, and the content ID is recalculated and compared to the original content ID to ensure authenticity.
Upon conclusion of a data migration job, ONEPASS reports provide documentation detailing the chain-of-custody for each file, and reasons why a file was not migrated, such as filter exclusion rules, missing media, or corrupt data, thereby satisfying even the most demanding auditors.
ONEPASS Migration platforms include:
• EMC DiskXtender (formerly Legato and OTG)
• IBM 3995/3996 Optical Libraries (IBM OS/400)
• Plasmon Archive Appliance
• IBM FileNet OSAR
• PoINT Jukebox Manager
• QStar Archive Storage Manager
• Others upon request
Optical Media formats we migrate:
• Magneto-Optical (1.3GB, 2.6GB 5.2GB, 9.1GB)
• Ultra Density Optical (30GB, 60GB)
• 12″ Optical (12GB LM-6000, 30GB LM-8000)