On Wed, September 16, 2009 9:35 am, Leslie Rhorer wrote: > > 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? It's best not to use --lazy if yo really want to stop the array. It makes it harder to find the problem. You seem to have covered everything that I can think of that would keep a filesystem active... > > 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: > Try adding --verbose to the "mdadm --assemble" line. If that doesn't give you any hints, post the output and it might give me some hints. NeilBrown > # 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 > -- 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
