Hi, I created a RAID10 out of 2 RAID1 arrays on a SL4.2 system with SCSI disks: mdadm --create --force /dev/md11 --verbose --level=raid1 --raid-devices=2 /dev/sdb1 /dev/sdi1 mdadm --create --force /dev/md12 --verbose --level=raid1 --raid-devices=2 /dev/sdc1 /dev/sdj1 mdadm --create --force /dev/md10 --verbose --chunk=64 --level=raid0 --raid-devices=2 /dev/md11 /dev/md12 This RAID10 array is assembled and usable, but when I reboot the system, only the underlying RAID1 arrays are assembled, the RAID10 array is not. Can anybody help me? Best regards Peter Dr. Peter Stauffert Boehringer Ingelheim Pharma GmbH & Co. KG e-mail: [log in to unmask]