APC RAID Subsystem SCSI-SATA II - Manual (Page 81)

- 81 -
4.6 Disk roaming
Physical disks can be re-sequenced in the same system or move whole physical
disks from system-1 to system-2. This is called disk roaming. Disk roaming has
some constraints as described in the following:
1. Check the firmware of two systems first. It’s better that both have same
firmware version or newer.
2. Whole physical disks of related VG should be moved from system-1 to
system-2 together. The configuration of both VG and UDV will be kept
but LUN configuration will be cleared to avoid conflict with system-2.
4.7 Support Microsoft MPIO and MC/S
MPIO (Multi-Path Input/Output) and MC/S (Multiple Connections per Session)
both use multiple physical paths to create logical "paths" between the server and
the storage device. In the case which one or more of these components fails,
causing the path to fail, multi-path logic uses an alternate path for I/O so that
applications can still access their data.
Microsoft iSCSI initiator supports multi-path function. Please follow the
procedures to use MPIO feature.
1. A host with dual LAN ports connects cables to IS16GL.
2. Create a VG/UDV, attach this UDV to the host.
3. When installing “Microsoft iSCSI initiator”, please install MPIO driver
at the same time.
4. Logon to target separately on each port. When logon to target, check
“Enable multi-path”. Please refer to Appendix D, step 6.
5. MPIO mode can be selected on Targets à Details à Devices à
Advanced.
6. Rescan disk.
7. There will be one disk running MPIO.
For detailed setup steps, please refer to Appendix F: MPIO and MC/S setup
instructions. MC/S setup steps are very similar to MPIO, please also refer to
Appendix: F.