On 09/29/2017 03:33 PM, John Stoffel wrote:
"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
I was still using the overlay. I just tried the grow without the overlay
and got the same error.
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