IBM TotalStorage DS300, Best Practices Manual, Page: 83 / 680

Chapter 3. Components overview
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򐂰 Access Control Lists – ability to select which servers can access each storage
partition or target (LUN mapping/masking). Access Control Lists allow the
user to assign LUNs to servers and designate read/write or modify rights in
order to improve security of data.
򐂰
Online logical drive expansion
򐂰 Online RAID level migration
See 4.8.6, “Increase logical drive capacity” on page 152 for information about
how to increase logical drive capacity, and 4.8.7, “Expand or migrate arrays” on
page 155 for information about how to migrate arrays.
3.9.1 Boot from SAN
IBM TotalStorage DS400 and DS300 allow you to boot from the SAN rather than
from local disks on individual servers, that can enable you to maximize
consolidation of IT resources and minimize equipment cost. Boot from SAN is a
remote boot technology where the source of the boot disk is on the SAN. The
server communicates with the SAN through host bus adapters (HBA). The HBA
BIOS contains the instructions that enable the server to find the boot disk on the
SAN. Booting from the SAN provides you a rapid Disaster Recovery as all the
boot information and production data is stored on a local or remote SAN
environment.
The DS300 operates on iSCSi and it supports booting from SAN using iSCSI
interconnect to the SAN, provided iSCSI HBAs are used to enable the boot
process.
See 9.1, “Boot Microsoft Windows Server 2003 from DS400 with IBM SMB Host
Bus Adapter” on page 448 for a sample scenario.
Refer to the Microsoft Web site for more information and implementation on
booting from SAN:
Note: Single drives and RAID 50 arrays cannot be migrated. In addition,
migration to a RAID 50 array from any other RAID level is not supported.
Important: Boot from SAN is not supported using an iSCSI software initiator.
No sharing of boot images is allowed, as Windows servers cannot currently
share a boot image. Each server requires its own dedicated LUN to boot.
There is no path failover support for either the DS300 or the DS400 when
booting from SAN.