>>>>> "Eli" == Eli Ben-Shoshan <eli@xxxxxxxxxxxxxx> writes: Eli> On 09/29/2017 08:38 AM, John Stoffel wrote: >>>>>>> "Eli" == Eli Ben-Shoshan <eli@xxxxxxxxxxxxxx> writes: >> Eli> I need to add another disk to my array (/dev/md128) when I accidentally Eli> did an array resize to 9 with the following command: >> Eli> First I add the disk to the array with the following: >> Eli> mdadm --manage /dev/md128 --add /dev/sdl >> Eli> This was a RAID6 with 8 devices. Instead of using --grow with Eli> --raid-devices set to 9, I did the following: >> Eli> mdadm --grow /dev/md128 --size 9 >> Eli> This happily returned without any errors so I went to go look at Eli> /proc/mdstat and did not see a resize operation going. So I shook my Eli> head and read the output of --grow --help and did the right thing which is: >> Eli> mdadm --grow /dev/md128 --raid-devices=9 >> Eli> Right after that everything hit the fan. dmesg reported a lot of Eli> filesystem errors. I quickly stopped all processes that were using this Eli> device and unmounted the filesystems. I then, stupidly, decided to Eli> reboot before looking around. >> >> >> I think you *might* be able to fix this with just a simple: >> >> mdadm --grow /dev/md128 --size max >> >> And then try to scan for your LVM configuration, then fsck your volume >> on there. I hope you had backups. >> >> And maybe there should be a warning when re-sizing raid array elements >> without a --force option if going smaller than the current size? Eli> I just tried that and got the following error: Eli> mdadm: Cannot set device size in this type of array Eli> Trying to go further down this path, I also tried to set the size Eli> explicitly with: Eli> mdadm --grow /dev/md150 --size 1953383512 Eli> but got: Eli> mdadm: Cannot set device size in this type of array Eli> I am curious if my data is actually still there on disk. Eli> What does the --size with --grow actually do? It changes the size of each member of the array. The man page explains it, though not ... obviously. Are you still running with the overlays? That would explain why it can't resize them bigger. But I'm also behind on email today... John -- 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
