Restore Operations
4
DD400 Series Restorer User Guide
Typical compression ratios are 20:1 over 20 weeks assuming weekly full and daily incremental
backups. A backup that includes many duplicate or similar files (files copied several times with
minor changes) benefits the most from compression.
Depending on backup volume, size, retention period, and rate of change, the amount of
compression can vary. The best compression happens with backup volume sizes of at least 10 MB.
See “Display File System Space Utilization” on page 81 for details on displaying the amount of
user data stored and the amount of space available.
Global Compression functions within a single restorer. To take full advantage of multiple restorers,
a site that has more than one restorer should consistently backup the same client system or set of
data to the same restorer. For example, if a full backup of all sales data goes to
restorerA
, the
incremental backups and future full backups for sales data should also go to
restorerA
.
Restore Operations
With disk backup through the restorer, incremental backups are always reliable and access time for
files is measured in milliseconds. Furthermore, with a restorer, you can perform full backups more
frequently without the penalty of storing redundant data. With tape backups, a restore operation
may rely on multiple tapes holding incremental backups. Unfortunately, the more incremental
backups a site has on multiple tapes, the more time-consuming and risky the restore process. One
bad tape can kill the restore.
From a restorer, file restores go quickly and create little contention with backup or other restore
operations. Unlike tape drives, multiple processes can access a restorer simultaneously. A restorer
allows your site to offer safe, user-driven, single-file restore operations.
Replicator
The Data Domain OS Replicator product sets up and manages the replication of backup data
between two restorers. After replication is started, the originator automatically sends any new
backup data to the replica.
A Replicator pair is an originator restorer that receives data from backup servers and a replica
restorer that receives data only from the originator. You can mount the replica as read-only for
restoring data through systems other than the originator. A replica can also take the place of a
non-functioning originator in a disaster recovery situation.
Restorer Hardware Interfaces
You can configure and administer a restorer using a directly-connected serial console, an Ethernet
connection from another system, or a monitor and keyboard. All hardware interfaces are on the
back panel of the restorer. See Figure 5 on page 12 and Figure 7 on page 14 for interface locations.
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Страница 194: ...Procedure Replace a Replica 156 DD400 Series Restorer User Guide ...
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