On Sun, 24 Jan 2010 19:25:23 -0800 (PST) anoneironaut84 <anoneironaut@xxxxxxxxxxx> wrote: > > Hey all, > > I'm just wondering if there is any way to recreate a linear array. For > example in a simple two disk linear RAID array if one disk fail if I replace > the old drive with a working drive can I stop the linear RAID array, format > the simple device nodes and recreate the array? I tried to do something > like this but failed: Yes, you could do that. But mode of the data would be missing, so I don't really see much point. > > bash# mdadm --manage /dev/md1 -f /dev/sda2 > mdadm: set /dev/sda2 faulty in /dev/md1 > bash# mdadm --manage /dev/md1 -f /dev/sdb2 > mdadm: set /dev/sdb2 faulty in /dev/md1 It doesn't really make sense to set a device in a linear array to faulty as there is no alternative strategy that can be used to read or write. So as you notice, the 'faulty' status is not recorded: > bash# cat /proc/mdstat > Personalities : [linear] [raid1] > md1 : active linear sdb2[1] sda2[0] > 957216768 blocks 64k rounding > > md0 : active raid1 sdb1[1] > 9775424 blocks [2/1] [_U] > > unused devices: <none> > bash# mdadm --manage /dev/md1 -r /dev/sdb2 > mdadm: hot remove failed for /dev/sdb2: Device or resource busy > bash# mdadm --manage /dev/md1 -r /dev/sda2 > mdadm: hot remove failed for /dev/sda2: Device or resource busy > bash# mdadm --manage /dev/md1 -fr /dev/sda2 > mdadm: hot remove failed for /dev/sda2: Device or resource busy Similarly you cannot remove individual devices from a linear array. You can only sort the whole array, then maybe restart it. > bash# mdadm --manage --stop /dev/md1 > mdadm: fail to stop array /dev/md1: Device or resource busy Presumably the device is mounted? > bash# fuser -m /dev/md1 > bash# fuser -m /dev/sda2 > bash# fuser -m /dev/sdb2 I guess no process is using the mounted filesystem? What does cat /proc/mounts show? > bash# mdadm --manage --stop /dev/md1 > mdadm: fail to stop array /dev/md1: Device or resource busy > bash-2.05b# lsof | grep md1 > bash-2.05b# > > Would appreciate some input. > > Thanks! > > -JD > > PS My system is RHEL-4 running on the 2.6.22 kernel. NeilBrown -- 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
