On 25/05/20 19:18, Thomas Grawert wrote: > >> https://raid.wiki.kernel.org/index.php/Linux_Raid#When_Things_Go_Wrogn >> >> Especially >> >> https://raid.wiki.kernel.org/index.php/Asking_for_help >> >> More will follow but we need this info. > > You´re totally right. Sorry for not quoting. > > All drives are new. > > root@nas:~# smartctl --xall /dev/sda > smartctl 6.6 2016-05-31 r4324 [x86_64-linux-4.9.0-12-amd64] (local build) > Copyright (C) 2002-16, Bruce Allen, Christian Franke, www.smartmontools.org > > === START OF INFORMATION SECTION === > Device Model: WDC WD120EFAX-68UNTN0 The EFAX had me worried a moment, but these are 12TB Reds? That's fine. A lot of the smaller drives are now shingled, ie not fit for purpose! Debian 10 - I don't know my Debians - how up to date is that? Is it a new kernel with not much backports, or an old kernel full of backports? What version of mdadm? That said, everything looks good. There are known problems - WITH FIXES - growing a raid 5 so I suspect you've fallen foul of one. I'd sort out a rescue disk that you can boot off as you might need it. Once we know a bit more the fix is almost certainly a rescue disk and resume the reshape, or a revert-reshape and then reshaping from a rescue disk. At which point, you'll get your array back with everything intact. Cheers, Wol
