Data Reduction Chapter 5 - Automated Data Migration
In previous chapters, we’ve talked about the need to reduce your data storage footprint in order to help survive the tidal wave of data, and the first steps in doing so include eliminating unnecessary duplication of data, and then categorizing your data so you can make smarter decisions on where to store it, and for how long.
In this chapter, we take the next step by automating these data management policies through three distinct processes: migration, archival, and expiration. The net result of these processes is to remove unneeded data from your production storage systems, which will reduce or delay your need to acquire more expensive hardware and reduce administrative costs, all without impacting key operational processes.
In the old days of computing and storage management, the concept of transparently moving data from one tier of storage to another was called hierarchical storage management, or HSM. Given IBM’s heritage in mainframes, we still use that term today. More recently, this concept morphed into Information Lifecycle Management (ILM), but it’s the same basic principle – move older, less-frequently accessed data off your most expensive storage devices onto slower, less costly storage media.
HSM and ILM solutions work transparently in the background, automatically selecting and moving files from primary to secondary tiers of storage based on the policy criteria that you set, such as file size or length of time since a file has been opened. They leave a pointer, or stub file, where the data was originally stored so that users and applications don’t need to worry about where the data was moved; the software transparently reroutes the request for any moved files. These solutions automatically move data to the proper media based upon policies you set, freeing up valuable disk space for active files and providing automated access to the migrated files when needed.
Data migration solutions help customers get control of, and efficiently manage, data growth and its associated storage costs by providing automated space management. These solutions should provide the following key features:
• Storage pool “virtualization” helps maximize utilization of the managed storage resources.
• Restore management is optimized based on the location of the data in the hierarchy.
• Migration is transparent to the users and to applications.
• Migrations are scheduled to minimize network traffic during peak hours.
• Automatic migrations occur outside the backup window.
• By setting proper threshold limits, annoying ‘out of disk space’ messages can be eliminated.
The IBM Tivoli Storage Manager (TSM) family includes two solutions for automating the migration of data between multiple tiers of storage. TSM 6 for Space Management is for AIX, HP-UX, Solaris and Linux data, while TSM HSM for Windows is for Windows servers.
Tivoli Storage Manager data migration solutions not only help you clean up your primary storage systems to help them run more efficiently, they can also be used to easily move data to new storage technologies as they are deployed. Migrating files to Tivoli Storage Manager also helps expedite restores, because there is no need to restore migrated files in the event of a disaster.
The benefits of Hierarchical Storage Management or Information Lifecycle Management include:
• Improve response times of file servers by off-loading inactive data
• Slow or even stop the growth of your production storage environment
• Use existing storage assets more efficiently
• Reduce backup times and resource usage by focusing on active files only
• Eliminate manual file system clean-up activities
In the next chapter, we’ll look at HSM’s big brother – archiving.
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Data Reduction - Chapter 5
Richard Vining 2700019R2A firstname.lastname@example.org Tags:  storage-blog data-management archive data-reduction backup deduplication space-managment hsm 1,182 Visits