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RAM-SAN
8 Gigabytes
System
Memory
Fibre Channel
ports
3 Gigabyte drive
1
3 Gigabyte drive
HBA 1 HBA 2 HBA 3
FC21 FC21
HBA 4
2 Gigabyte
drive
3 & 4 2
4.3.2 Resizing LUNs
The first step in changing the configuration is to resize the LUNs. Since our new configuration calls for three different
LUNs, we need to use the ‘r’ command to resize LUNs. This command allows us to keep or delete the previous LUN mask
and port assignments. This is useful if the only change is in the size of the LUNs. In this case, we want to delete any
previous port and LUN masks that had been made. The following show the procedure for creating the three LUNs for our
example.
Command (h for help): r
How many LUNs would you like to make? 3
Would you like to remove port assignments (Y/n)? <enter>
Would you like to remove LUN masks (Y/n)? <enter>
LUN 0 size (default 8192 Mb): 3072
LUN 1 size (default 5120 Mb): 3072
LUN 2 size (default 2048 Mb): <enter>
Command (h for help): p
Enter the LUN number (1-3, default is all): <enter>
LUN 1 -- 3072 Mb
ports:
access: Open access
LUN 2 -- 3072 Mb
ports:
access: Open access
LUN 3 -- 2048 Mb
ports:
access: Open access
Command (h for help):
At this point, we have divided the system memory into three LUNs. Next we need to assign ports to each LUN.
4.3.3 Attaching Fibre Channel Ports to the LUNs
Now that we have created our LUNs, we need to assign the Fibre Channel ports to them. This is accomplished with the
‘l’(ell) command. We simply link a particular LUN to a port number. The follow example shows how this is done.
Command (h for help): l
RAM-SAN User’s Guide Texas Memory Systems, Inc. (February 7, 2003) 4-3