7065DS3KIntro.fm Draft Document for Review August 30, 2007 12:59 am
24 IBM System Storage DS3000: Introduction and Implementation Guide
In-band management
In-band management method uses the I/O path between the host server and the DS3000 to
transfer management commands and information.
This method does not use the management Ethernet ports on DS3000 RAID controllers and
does not require a management TCP/IP network. However, it does require a special
access
logical drive
to manage the DS3000 controllers. This means you cannot configure the
maximum number of logical drives, since one of them is reserved for the access logical drive.
But this is usually not a problem, since virtually all customers will find the maximum number of
logical drives more than sufficient.
An example of in-band management is shown in Figure 2-12. Two host servers are attached
to the DS3400 subsystem with FC cables. They both run SMagent code. The management
workstation runs SMclient code. SMclient communicates with SMagent via Ethernet, and
SMagent communicates with the DS3000 across the FC I/O path.
Figure 2-12 In-band management
Access logical drive
The access logical drive exists in each storage partition by default - no manual configuration
is required. This is not actually a real logical drive, although it is presented to the operating
system as a drive on LUN 31. In order to allow for in-band management communication
across the I/O path, we need a target device for SCSI commands. The SCSI commands to
this target are used as a vehicle for Storage Management communication along the I/O path.
The access logical drive is that target device. The access logical drive is also sometimes
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