IBM TotalStorage DS300, Руководство по лучшим практикам, Страница: 49 / 680

Chapter 3. Components overview
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iSCSI adapters in the servers are used to communicate over an IP network to the
DS300 disc subsystem. An alternative to iSCSI hardware adapters in the servers
is to use iSCSI software initiators instead. These have the advantage of reduced
costs in the server. However, they have the disadvantage of less security and
increased server CPU utilization.
The IBM TotalStorage DS300 is available in 3 models as shown in Table 3-2.
Table 3-2 DS300 models
1701-1RL 1701-1RS 1701-2RD
iSCSI RAID controller 1 1 2
Controller upgrade No Yes N/A
Controller system memory 512MB max 512MB, 1GB max 512MB, 1GB max
RAID cache (per controller) none 256MB 256MB
Battery backup for cache No Yes Yes
Flashcopy copy services 4 volumes 256 Flashcopy target
logical drives with
1GB system memory
256 Flashcopy target
logical drives with
1GB system memory
Gbps Ethernet ports/controller 1 3 3
Power supply w/fan unit 1 2 2
Disk bays 7, 14 max
a
a. More than 7 hard disk drives require an optional power supply.
14 14
LED indicators 8 12 12