Retain existing data with HP 24 Bay 3Gb SAS Expander Card?

Hi.

We have an HP DL380 G7, an existing drive cage with 8 x SAS disks and a P410i embedded RAID controller (512MB).  We are installing a second drive cage with another 4 x SAS disks and using an HP 24 Bay 3Gb SAS Expander Card to facilitate this.

As both drive cages will now be cabled through the SAS Expander Card, I just wanted to be sure that the existing Server data held on the 8 x SAS disks will remain intact and the disk configurations won't get overwritten etc?

Thanks.

D