I'm still trying to wrap my mind around two items. One is stopping an array. From time to time I need to stop an array for some reason, but I am persistently having trouble doing so. It doesn't always happen, and sometimes when it does I can free it up by doing `exportfs -ua` and `umount -l /xxxxx`, but other times it simply cannot be done and my only recourse is to reboot the system. These are simple RAID5 or RAID6 arrays on raw drives with a single file system formatted on the unpartitioned array. None of the drives are used for booting or for swap, there is no loop device and lsof shows no open files, but mdadm -S still fails with a device busy error. Every time it has happened, a simple umount command without the -l switch fails, but a "lazy" umount appears to work, with the exception that sometimes I still cannot stop the array. Clearly, the NFS export is sometimes the culprit, but not always. What else can it be? The second item is assembling an array which was formerly stopped. By my reading, `mdadm --assemble --scan` should work, but it doesn't. It keeps telling me no devices are found for the array. Here is a sample from one of the /etc/mdadm/mdadm.conf files: # mdadm.conf # # Please refer to mdadm.conf(5) for information about this file. # # auto-create devices with Debian standard permissions CREATE owner=root group=disk mode=0660 auto=yes # automatically tag new arrays as belonging to the local system HOMEHOST <system> # instruct the monitoring daemon where to send mail alerts MAILADDR lrhorer@xxxxxxxxxxx # This file was auto-generated on Fri, 21 Nov 2008 22:35:30 -0600 # by mkconf $Id$ PROGRAM /usr/bin/mdadm_notify DEVICE /dev/sd[a-j] ARRAY /dev/md/0 level=raid6 metadata=1.2 num-devices=10 UUID=5ff10d73:a096195f:7a646bba:a68986ca name=RAID-Server:0 When I manually assemble the array, I wind up having to re-create the bitmap file, as well. -- 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
