Novell OPEN ENTERPRISE SERVER 2 SP2 - ADMINISTRATION, Руководство по внедрению, Страница: 127 / 288

Storage and File Systems 127
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client users and Samba/CIFS users who access the primary volume see the files and
subdirectories from both volumes as if they were all on one volume. All the actions they take—
renaming, deleting, moving, etc.—are synchronized by Dynamic Storage Technology across the two
volumes.
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 SP2: Dynamic Storage
Technology Administration Guide .
Direct-Attached Storage Options (NSS and Traditional)
As shown in Figure 13-1 on page 124 , 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 SP2: Storage and File
Services Overview .
Advanced Storage Options (NSS Only)
NSS volumes support the following advanced storage solutions, as documented in the OES 2 SP2:
Storage and File Services Overview .
Š
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.
Š 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.
Š
Novell iSCSI
You can create a SAN using Novell iSCSI, which uses Novell eDirectory
TM
to manage
iSCSI resources, including granting trustee rights and user file access. For information,
see
NW 6.5 SP8: iSCSI 1.1.3 Administration Guide .
Š
Fault-Tolerant and High-Availability Architectures