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Vol. 2 No. 1 March 2003

How to do hybrid backup

Traditionally, backups have been usually targeted to tape drives, but more and more disk storage is being incorporated into the backup process. One common approach with disk-based backups is using disk as a staging area before copying data to tape, which is known as a two-stage backup architecture. Other strategies include using disk as a complete replacement for tape media. Data is archived to disk in the form of virtual copies (space-saving snapshots) or full volume, byte-for-byte copies. Often hosts will have their disk backups stored on one or two dedicated disk arrays exclusively used for backup storage. Another backup approach balances the mix of disk and tape for data protection. Instead of implementing a two-stage backup, disk and tape are both used as archival media and are incorporated into the tape rotation and retention schedule. For example, instead of using tape solely as the backup medium, disk is substituted to store and age incrementals, allocating tape exclusively for full backups. Disk backups have many ...

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Features in this issue

  • Tap the SAN for File Storage

    Used to be, if you wanted to give users a central place to store files, you had two options: put them on a generic file server, or on a NAS device.

  • Sony Joins Super Drive Game

    The market for super drives is alive and kicking, according to a recent report from Freeman Reports, with unit shipments more than doubling from 2001 to 2002.

  • Symmetrix DMX: Is it Hot or Not?

    The year is still young, but EMC's Symmetrix DMX announcement is arguably 2003's biggest storage story.

  • Surveillance Gradually Going Digital

    Security-conscious companies who started out using analog videotapes, are gradually making the switch to digital, offloading to digital tape and occasionally, cheap ATA disk.

  • Ease backup pain

    OK, maybe there's no cure, but a variety of bandages and pills can help. We look at the major backup packages and analyze what each does best.

  • Bring DBAs into the SAN era

    by  Jim Booth

    You may not want DBAs poking around inside your fabric, but the more they understand about SANs, the better they'll be.

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