SCSI drivers for RAID

hi there.

I’m trying to build some RAID (mirror) under QNX4.25
I’successfully build some using ACCUSYS 9910 box on
an adaptec 2910 SCSI card drived using Fsys.aha8scsi.

but I got serious crash problems from time to time.

Does some of you use a reliable mirror solution on SCSI disks
on QNX 4.25.

best regards.