On Wed, 2006-02-01 at 09:45 +0000, Terry Barnaby wrote: > Hi, > > I have just set up a Raid 5 disk array using 4 SATA disks on Fedora 4. > To test the setup I unplugged the SATA cable from one of the disk drives. > I was expected the system to carry on with messages from the Raid system > indicating that there was a disk drive down. > > However the Raid 5 partition became completely inaccessable after un-plugging > the drive. The kernel reported disk errors but there was no error messages > from the Raid system and "mdadm -Q --detail /dev/md2" reported that there > was no problems with the Raid array. > > When I rebooted the system (needed a reset) the Raid system reported that > one disk was down and the partition became readable again. > > It appears that the default configuration of the Raid 5 system does not > handle a complete drive failier during up-time. I presume it may respond to > disk errors from a disk drive that is connected but once disconnected the > Raid system appears to ignore errors. > > Is there a configuration option to allow the Raid system to respond to > a completely broken drive or cable ? > > Terry > A. Are you sure your machine/controller hot plug? SATA doesn't support it by default. (You'll need special drive enclosures and hot-plug-supporting controller. B. Can you post your complete machine configuration? Gilboa
