Red Hat Bugzilla – Bug 178728
when usb raid on usb or firewire raidautorun fails
Last modified: 2014-03-16 22:57:50 EDT
From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.5) Gecko/20041215 Firefox/1.0 Red Hat/1.0-12.EL4 Description of problem: I built a usb raid5 device set under md0 which has LVM on top of it, and is NOT the root fielsystem. md0 is composed of 5 USB drives sd[a-e] On line 220 on rc.sysinit echo "raidautorun /dev/md0" | nash --quiet will fail as it tries to mount /dev/md0 it fails because the usb subsystem has not yet fully created all the udev nodes for the usb devices. This will cause a boot panic and dump you into single user mode. Version-Release number of selected component (if applicable): initscripts-7.93.11.EL-1 How reproducible: Always Steps to Reproduce: 1. you need 3 external usb hardrives 2. create 3 usb external HD parted as software raid and define md0 to be sd[a-c] 3. reboot Additional info:
echo "raidautorun /dev/md0" | nash --quiet This does not try to mount the device... that does not happen until later. Can you get the kernel messages when it drops you to single-user mode? Is it creating an incomplete array?
when the autorun executes it does try to start md0, sicne the devices arent all present, the raid fails to start resulting in a failed array with 0 devices single since udev hasnt added the node for the usb devices yet.
OK. mdadm -As later does not reassemble it once it fails, correct?
mdadm -As will assemble it later on, IF you stop the raidautorun from invoking so you can finish the boot process without dropping into single user mode.
The drop into single user mode should be after mdadm runs.... it shouldn't get fscked until the second invocation.
correct, but when it tries to assemble not all the drives are ready , marks drives as bad, you can force a clean re-assmbly later but once you exit single user as you know it reboots, doing it all over again
*** This bug has been marked as a duplicate of 198704 ***