Data Domain DD400 Series, User Manual

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DD400 Restorer Models
2 DD400 Series Restorer User Guide
Referring to Figure 1 on page 1, data flows to a restorer through an Ethernet connection.
Immediately, data verification processes begin that follow the data for as long as it is on the
restorer. In the file system, Data Domain OS Global Compression™ algorithms prepare the data for
storage. Data is then sent to the disk RAID subsystem. The algorithms constantly adjust the use of
storage as the restorer receives new data from backup servers. Restore operations flow back from
storage, through decompression algorithms and verification consistency checks, and then through
the Ethernet connection to the backup servers.
DD400 Restorer Models
The DD400 series of restorers includes four platforms. From a high-level viewpoint, the
differences between three platforms are the number of disks and the amount of data storage
capacity. The fourth platform, the DD400g Gateway, has no internal disks, instead storing data on
external disk arrays through a fiber channel connection.
The platforms and their differences are::
Applications that Send Data to a Restorer
The Data Domain OS (operating system) is designed specifically for storing relatively large
streams of sequential data from backup software and is optimized for high throughput, continuous
data verification, and high compression. A restorer makes optimum use of its disk space and
compression algorithms when it backs up file systems of at least 10 MB.
Restorer performance when storing data from applications that are not specifically backup software
is best when:
•
Data is sent to the restorer as sequential writes (no overwrites).
Table 1: DD400 series restorers
Platform DD460 DD430 DD410 DD400g
Disks 16 by 400 GB 8 by 400GB 8 by 160 GB Fiber channel
connection to
external disk arrays
CPU 2 by 3.2 GHz 1 by 3.2 GHz 1 by 3.0 GHz 2 by 3.2 GHz
Raw storage 6.4 TB 3.2 TB 1.3 TB (N.A.)
Space available
for data storage 3.9 TB 1.9 TB 0.7 TB 4.2 TB