On Tue, 22 May 2018, Axel Spallek IT-Dienstleistungen wrote:
I read a howto where one wrote I should recreate the raid: Mdadm -create --level=5 --raid-devices=4 /dev/md1 /dev/sdb1 /dev/sdc1 /dev/sdd1 /dev/sde1 That did it, but I could not mount it. I realized, that the raid was marked degraded and tried to recover by writing to /dev /sde1. I paniced, because all drives appeared ok (AAAA) when I scaned them so I stopped the RAID. Then I reassembled them with the three devices but never managed to mount it. I read that the order of the drives is important. Is hat true? Did I destroy the RAID?
If you got the order incorrect, then most likely you have destroyed your RAID, yes. It will have scrambled your filesystem blocks and overwritten lots of them with the wrong data.
https://raid.wiki.kernel.org/index.php/Linux_Raid#When_Things_Go_Wrogn is very explicit about this:
"In particular NEVER NEVER NEVER use "mdadm --create" on an already-existing array unless you are being guided by an expert."
-- Mikael Abrahamsson email: swmike@xxxxxxxxx -- 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
