Novell OPEN ENTERPRISE SERVER - CONVERSION GUIDE 12-2010, Руководство по внедрению

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Storage and File Systems 125
Unlike the NCP client, backup tools see the volumes separately and can therefore apply one backup
policy to the primary and a different backup policy to the secondary volume.
You can use Dynamic Storage Technology to substantially reduce storage costs by placing your less
frequently accessed files on less expensive storage media. You can even employ a “move on
demand” migration strategy by defining new, more expensive SAN or RAID storage that is initially
empty as the primary volume, and then configuring Dynamic Storage Technology so that data is
migrated to this primary storage only when it is accessed.
In addition, Dynamic Storage Technology doesn’t suffer the performance penalty that HSM
solutions do.
For more information about Dynamic Storage Technology, see the OES 2 SP3: Dynamic Storage
Technology Administration Guide .
Direct-Attached Storage Options (NSS and Traditional)
As shown in Figure 13-1 on page 122 , you can install traditional volumes and Novell Storage
System (NSS) volumes on both OES platforms. These devices can be installed within the server or
attached directly to the server through an external SCSI bus.
For more information, see “ Direct Attached Storage Solutions ” in the OES 2 SP3: Storage and File
Services Overview .
Advanced Storage Options
NSS volumes support the following advanced storage solutions, as documented in the OES 2 SP3:
Storage and File Services Overview .

Network Attached Storage Solutions
A dedicated data server or appliance that provides centralized storage access for users and
application servers through the existing network infrastructure and by using traditional LAN
protocols such as Ethernet and TCP/IP. When Gigabit Ethernet is used, access speeds are
similar to direct attached storage device speeds.
The disadvantage is that data requests and data compete for network bandwidth.

Storage Area Network Solutions
A separate, dedicated data network consisting of servers and storage media that are connected
through high-speed interconnects, such as Fibre Channel.

iSCSI SAN
You can create a SAN using Linux iSCSI.

Fault-Tolerant and High-Availability Architectures
Use one or more of the following technologies:

Multiple Path I/O : The Linux Device Mapper Multipath I/O tool helps prevent failure in
the connection between the CPU and the storage device by automatically identifying
multiple paths between each Linux server and its storage devices.

Software RAIDs : NSS supports software RAIDS to improve storage availability and
performance by enhancing data fault tolerance and I/O performance.
For more information, see “ Managing NSS Software RAID Devices ” in the OES 2 SP3:
NSS File System Administration Guide for Linux .