I have a DELL PowerEdge 2300 (AIC 7890 + AIC 7860) server with a 6 slot hot-plug backplane, 4 ultra2-wide drives connected to the 7890. I'm running Linux kernel version 2.0.35 with aic7xxx 5.1.2 and raid0145-19981005 patches, with 3 of the drives configures as a RAID-5 device (md0 : active raid5 sdd2[2] sdc2[1] sdb2[0] 17510656 blocks level 5, 32k chunk, algorithm 2 [3/3] [UUU]). If I sync the filesystems and disconnect one of the RAID drives to simulate a drive breakdown, the entire SCSI chain hangs, and the only way to recover is to reboot the system. The RAID itself remains functional, as when I reconnect the drive, it will start to reconstruct itself in the background. However, I'd like to know that I could replace a broken drive without a system restart, as that's what the hot-plug backplane is there for.. :/ -- Murphy's Law only fails when you try to demonstrate it. Osma Ahvenlampi <[EMAIL PROTECTED]>