It is possible to attach a fully populated Hardware Port Multiplier onto another Hardware Port Multiplier. This allows a potentially unlimited amount of storage capacity by daisy chaining up to five HPM onto another HPM.
1. Connect Drives to first HPM
Connect 1-5 SATA hard drives onto the first HPM (Hardware Port Multiplier), and connect a floppy-type power connector onto the HPM.
2. Create RAID volume
Connect the Hardware Port Multiplier to a computer through a port multiplier compatible eSATA controller or the eSATA-USB 2.0 Adapter (AAU2ESA). Allow the SiI4726 Manager to recognize the Hardware Port Multiplier, then enter the Advanced area to create a RAID set. Any type of RAID set can be created, but only a single logical volume can be recognized using a drive connected to P1 of the HPM will be recognized. This means that if you were to create a RAID 0 set using the drives on P1 and P2, the three other drives connected to P3, P4, and P5 will not be seen when connected to the second HPM.
3. Connect first HPM to second HPM
Once configuration of the logical volume is complete, disconnect the eSATA cable from the HPM. Connect the eSATA end of the eSATA-SATA converter cable (AASA2SAP15C) onto the HOST eSATA connector on the first HPM. Connect one end of a standard SATA-SATA cable onto the converter cable, and connect the other end onto one of the SATA ports on the second HPM. Repeat steps 1-3 until you have all the Hardware Port Multipliers you would like connected onto the second HPM.
4. Creating RAID on the second HPM
With all of the HPM connected onto the second HPM, connect the HOST eSATA connection on the second HPM to the computer through a port multiplier compatible or through the eSATA-USB 2.0 Adapter. In the SiI4726 Manager, you will see the new logical volumes you created corresponding to each of the ports which have a HPM connected. To have all of the volumes seen individually by the operating system, configure all of the volumes as JBOD. It is also possible to create another RAID set using these logical volumes to have all of the hard drives connected seen as a single volume.
Q. What if one of the hard drives from one of the HPM fail? How can the redundant RAID 1 or RAID 10 set be rebuilt?
A. Through the SiI4726 Manager, you will see indication of which logical volume is reduced. Disconnect the HPM and attach it directly onto the computer's PM-compatible eSATA port or through the eSATA-USB 2.0 Adapter. Using the SiI4726 Manager, rebuild the RAID array making sure that the progress is fully complete. When the rebuild task has completed, reconnect the HOST eSATA connection back onto the second HPM and the logical volume will be rebuilt.