Hi, The configuration is: Perc H200 controler configured with no RAID (mpt2sas driver), 2 SATA disks (sda and sdb), Linux MD Sofware RAID1 (md0), stock Linux 2.6.35.7 kernel. I hotunplug the second (sdb) disk, and the result is: . as expected, I can read sda device, . as expected, any read to sdb device fails, . unexpectedly, and read to md0 never returns. No oops or thing like that in the kernel log. I did not try the same with other kernel releases. Regards, Hubert Tonneau -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html