Enhanced Data Recovery

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Enhanced Data Recovery
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What is Enhanced Data Recovery?

• A backup and restore architecture that combines
  advanced software functionality with a disk based
  storage array to augment a traditional tape only
  solution.
• Enables the concept of Backup to disk, archive
  to tape.

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Definitions
Recovery Point amount of time that has elapsed
since the last known consistent copy of the
data Recovery Time amount of time required to
gain access to the data
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Business Drivers

• Growing storage capacities and rising downtime
  costs
• Pressure to reduce recovery time (RTO)
• Pressure to minimize data loss (RPO)
• Operations issues
• Shrinking backup windows
• Reliability issues in large environments
• Media costs media management getting out of
  control
• We are seeing a dramatic rise in the cost and
  complexity of backup operations.

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Whats wrong with traditional backups?

• Slow restore capabilities
• Reliability issues
• Shrinking backup windows
• Tape is a sequential access device
• Data written in a linear fashion
• Seek times to find data are very time consuming
• Cartridge load times are high
• Compression limited to linear algorithms

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Enhanced Data Recovery is the Solution

• Enabled by falling disk prices (ATA SATA)
• Also enabled by mature, advanced software
  functionality
• Leverages performance, reliability, and random
  access nature of RAID
• Augments tape capabilities

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Backup to Disk
Backup to disk Tape Backup
Backup to disk (individual file restore)
Tape Backup Backup to disk (full restore)
Recovery Point Similar to enterprise backup to
tape, however, improvement in reliability yields
lower average recovery point. Recovery Time
Full restore similar to tape, however,
significant improvement for single files
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Backup to Disk
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Backup to Disk Solution
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Tape Emulation
Tape Emulation Tape Backup
Tape Emulation (individual file restore)
Tape Backup Tape Emulation (full restore)
Recovery Point Similar to enterprise backup to
tape, however, improvement in reliability yields
lower average recover point. Recovery Time Full
restore similar to tape, however, significant
improvement for single files
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Tape Emulation
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Tape Emulation Solution
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Point-in-time Copy
Tape Backup
Tape Backup
Point-in-time Copy
Point-in-time Copy
Recovery Point reduced by splitting mirrors or
taking snapshots Recovery Time Significantly
reduced for full restore. Less convenient for
file level restores, however.
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Point-in-Time Copy
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Point-in-time Copy Solution
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Replication Based Backup
Tape Backup
Tape Backup
Replication Based BU
Replication Based BU
Recovery Point Minimized for asynchronous
replication, no lost data for synchronous
replication Recovery Time Short because of
on-line copy which can be used for single file
restore or used as the active file system
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Replication
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Replication Based Backup Solution
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Summary

• Enhanced data recovery incorporating disk
  technology is now cost effective and drives
  measurable business value
• There are distinct architectural approaches to
  using disk for data recovery and it is critical
  to understand the relative strengths and
  weaknesses of each
• Disk based architectures are currently used to
  augment, not replace, tape infrastructure