Re: RAID array is gone, please help

2017-03-23 Thread Stephen Mueller
First I'm getting the data off the RAID... then I'm going to delete the whole thing again... create a new RAID using partitions... follow every step carefully... then once the new RAID array is there, I'll throw a bit of data on it, and then reboot and see if it's still there... if so, I'll repo

Re: RAID array is gone, please help

2017-03-23 Thread Lennart Sorensen
On Thu, Mar 23, 2017 at 10:02:23PM +0100, Stephen Mueller wrote: > Looks like it worked! Thanks! Well at least you could backup the data, just in case. > I used: > > sudo mdadm --create /dev/md0 --assume-clean --verbose --level-10 > --raid-devices=4 /dev/sdc /dev/sdd /dev/sde /dev/sdf I wonder

Re: RAID array is gone, please help

2017-03-23 Thread Lennart Sorensen
On Thu, Mar 23, 2017 at 09:09:39PM +0100, Stephen Mueller wrote: > OK, I used gdisk to remove the GPT and MBR from each disk. > mdadm --assemble still doesn't work... says it can't find the > superblock. The mdadm --examine commands also say that no > superblock is detected. Yes the GPT overwrite

Re: RAID array is gone, please help

2017-03-23 Thread Stephen Mueller
Looks like it worked! Thanks! I used: sudo mdadm --create /dev/md0 --assume-clean --verbose --level-10 --raid-devices=4 /dev/sdc /dev/sdd /dev/sde /dev/sdf And I got my instructions for creating the array here, and they also don't use partitions... https://www.digitalocean.com/community/tuto

Re: RAID array is gone, please help

2017-03-23 Thread Stephen Mueller
OK, I used gdisk to remove the GPT and MBR from each disk. mdadm --assemble still doesn't work... says it can't find the superblock. The mdadm --examine commands also say that no superblock is detected. I guess I'll go ahead with --create... On 3/23/2017 20:59, Lennart Sorensen wrote: On Thu,

Re: RAID array is gone, please help

2017-03-23 Thread Lennart Sorensen
On Thu, Mar 23, 2017 at 08:38:08PM +0100, Stephen Mueller wrote: > Apologies, I should have started this on linux-raid... > > > stephen@fred> sudo gdisk -l /dev/sdc > GPT fdisk (gdisk) version 1.0.1 > > Partition table scan: > MBR: protective > BSD: not present > APM: not present > GPT:

Re: RAID array is gone, please help

2017-03-23 Thread Stephen Mueller
Apologies, I should have started this on linux-raid... stephen@fred> sudo gdisk -l /dev/sdc GPT fdisk (gdisk) version 1.0.1 Partition table scan: MBR: protective BSD: not present APM: not present GPT: present Found valid GPT with protective MBR; using GPT. Disk /dev/sdc: 7814037168 sec

Re: RAID array is gone, please help

2017-03-23 Thread Lennart Sorensen
On Thu, Mar 23, 2017 at 07:09:41PM +0100, r...@mueller.org wrote: > Thank you very much or your reply. > > I naively thought that starting without partitions would be the best > starting point, given 3 of the disks had been in a RAID5 array > previously (possibly with partitions, not sure), but th

Re: RAID array is gone, please help

2017-03-23 Thread raid
Thank you very much or your reply. I naively thought that starting without partitions would be the best starting point, given 3 of the disks had been in a RAID5 array previously (possibly with partitions, not sure), but that looks like a bad choice, based on some other things I've googled. Less

Re: RAID array is gone, please help

2017-03-23 Thread Lennart Sorensen
On Thu, Mar 23, 2017 at 05:49:05PM +0100, r...@mueller.org wrote: > I am hoping someone here will help me. Was reading this site... > > https://raid.wiki.kernel.org/index.php/Linux_Raid > > and it said to email this list if you've tried everything other than mdadm > --create. > > > I am running