It works. Boot log is attached. I ran mke2fs on all 4 drives simultaneously and all is . I did notice that DMA was disabled on the hardware? Do you need any info from my side for this? Should device node sdf on the 5th port exist even though no drive is installed on the 5th port? Thanks cat /proc/partitions major minor #blocks name 3 0 195360984 hda 3 1 19454683 hda1 3 2 175903717 hda2 3 64 160086528 hdb 3 65 160079661 hdb1 8 0 17921835 sda 8 1 56196 sda1 8 2 987997 sda2 8 3 16876282 sda3 8 16 293036184 sdb 8 17 293033601 sdb1 8 32 293036184 sdc 8 33 293033601 sdc1 8 48 293036184 sdd 8 49 293033601 sdd1 8 64 293036184 sde 8 65 293033601 sde1 8 80 320 sdf Tejun Heo wrote: > Please apply the attached patch on top of 2.6.24-rc7 and report the > result. Thanks. > >