yes, thanks, typo there. that was done hastily for the e-mail. i had tried the right thing previously and here it is again. still no luck: ch@snaggle:~$ sudo mdadm -E /dev/sd[defg]1 | egrep 'Events|^/dev/sd' /dev/sdd1: Events : 286024 /dev/sde1: Events : 286011 /dev/sdf1: Events : 286024 /dev/sdg1: Events : 286024 ch@snaggle:~$ sudo mdadm --assemble --force /dev/md0 /dev/sd[dfg]1 mdadm: ignoring /dev/sdf1 as it reports /dev/sdd1 as failed mdadm: /dev/md0 assembled from 0 drives and 2 spares - not enough to start the array. ch@snaggle:~$ On Sun, Dec 8, 2013 at 4:02 PM, Adam Goryachev <adam@xxxxxxxxxxxxxxxxxxxxxx> wrote: > On 09/12/13 10:32, Christopher Hoover wrote: >> >> hi folks, >> >> what's the safest way to get this array back into r/o mode? >> >> thanks, >> -ch >> ch@xxxxxxxxxxxxxx >> >> >> ch@snaggle:~$ sudo mdadm --examine /dev/sd[defg]1 | egrep 'Event|^/dev/sd' >> >> /dev/sdd1: >> >> Events : 286024 >> >> /dev/sde1: >> >> Events : 286011 >> >> /dev/sdf1: >> >> Events : 286024 >> >> /dev/sdg1: >> >> Events : 286024 >> >> ch@snaggle:~$ sudo mdadm --assemble --force /dev/md0 /dev/sdd1 >> /dev/sde1 /sdg1 >> >> mdadm: cannot open device /sdg1: No such file or directory >> >> mdadm: /sdg1 has no superblock - assembly aborted >> > > I'm no expert on this, but two questions: > Did you mean /dev/sdg1 ? > > Why not use sdd1, sdf1 and sdg1 since they have the correct event counts? > Then add sde1 and allow to resync? > > sudo mdadm --manage /dev/md0 --stop > sudo mdadm --assemble /dev/md0 /dev/sd[dfg]1 > sudo mdadm --manage /dev/md0 --run > > Try that, and provide any output > > > PS, it seems you would only need a minimum of 2 drives, and you have three > with matching event counts, so it should be fine. > > Regards, > Adam > > -- > Adam Goryachev > Website Managers > P: +61 2 8304 0000 adam@xxxxxxxxxxxxxxxxxxxxxx > F: +61 2 8304 0001 www.websitemanagers.com.au > -- 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