RHEL 5 After kernel upgrade RAID B110i failed

Hello,

I have HP DL320 G6 (Smart Array B110i SATA) server with two 250GB HDD SATA disks. It runs RHEL 5.7 i386. I have upgraded RHEL to 5.10 and did forget to upgrade kernel module hpahcisr. After reboot, server boots with no RAID working and only one disk (/dev/sdb) works as LVM (root and /home) and /dev/sda as /boot. fdisk -l shows two disk drives.

How to restore RAID without loosing data? How to resynchronise disk newest to oldest?