Hello dear ataraid-list subscribers ! Here is my story about rh7.3 and fasttrack tx2pro: I have installed my system with instructions taken form promise driver readme file. Installation went good - system was booting, everything was ok. I made test: switch off the first HD, message apeared in /var/log/messages and /dev/console that "first/master drive was discontected ... bla bla bla". I switeched HD and "first/Master HD is active, rebuilding of array in progress ... bla bla bla". In that score everything is good - background rebuilding is working. I made a decision to change my kernel from 2.4.18-3 (rh rpms) to 2.4.20 - security ... I have change my system to be suitable for ATARAID - options in kernel for fasttrack stuff, lilo, changes in /etc/fstab, /etc/lilo.conf ... My new configuration was working. Then again, i made test: exaclty the same like in the first time. And here my problems begins ... System is freezing, I can not make restart, only hard reset helps - nothing in logs. I have rebuilded the array from BIOS menu - ok, my system is working ... Why the background rebuilding is not working ? My conf: 2.4.20 kernel rh 7.3 with all erratas (without kernel rpms) new lilo intel motherboard fasttrack tx2 pro 2 x 80 MB seagate HD -- Best regards, gnu_is_not_unix