Symantec (Veritas)

Storage Migrator – UNIX, currently at version 6.5

Description:

Storage Migrator is a hierarchical storage management (HSM) product for distributed systems.  It can increase the amount of file space available to users by migrating files to secondary storage as space is needed in the local file system.  When a user accesses a migrated file, it is automatically retrieved from secondary storage and returned to the online file system.  Except for the delay to perform the retrieval, users and programs are unaware that file migration and retrieval are taking place.

Typical Use:

UNIX clients for Storage Migrator have their managed file systems NFS mounted to the UNIX server with Storage Migrator – UNIX on it.  As the user determines data is to be managed by Storage Migrator, they move the data (either manually or automatically through some process) to the managed file system.

The Storage Migrator – UNIX product resides on the UNIX server.  It is told which file systems to manage and based on configurable criteria such as size, age, and file system utilization; it marks the files for staging.  When the UNIX file system being managed reaches a particular setpoint, it will begin migrating (copying) files to tape (2 copies simultaneously – one for eventual offsite storage).  When the UNIX server reaches another particular setpoint, it stops.  When the UNIX file system being managed reaches a particular setpoint, it will begin deleting files leaving a small file stub on the UNIX server.  When the UNIX server reaches another particular setpoint, it stops.  There are Storage Migrator UNIX commands that can be run to determine if a file is migrated, staged or neither.

If or when the file is needed on the UNIX server, Storage Migrator will request the file to be transferred back to disk from tape.

At that point, the UNIX client (NFS mounted to the Storage Migrator server) would have instant access to it.  Since the file is still on tape, making space on the managed file system would simply involve making the stub again.

There are separate pools of tape for use by Storage Migrator.

The Production system is monitored via Patrol and logs and reports are checked during normal business days by the NetBackup Administrator in Storage Systems.

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