On 25/05/20 20:05, Thomas Grawert wrote: > 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. > > yes, that´s the 12TB WD-Red - I´m using five pieces of it. > > The Debian 10 is the most recent one. Kernel version is 4.9.0-12-amd64. > mdadm-version is v3.4 from 28th Jan 2016 - seems to be the latest, > because I can´t upgrade to any newer one using apt upgrade. OW! OW! OW! The newest mdadm is 4.1 or 4.2. UPGRADE NOW. Just download and build it from the master repository - the instructions are in the wiki. And if Debian 10 is the latest, kernel 4.9 will be a franken-patched-to-hell-kernel ... I believe the latest kernel is 5.6? > > I don´t think I need a rescue disk, because the raid isn´t bootable. > It´s simply a big storage. > Okay, the latest mdadm *might* fix your problem. However, you probably need a proper up-to-date kernel as well, so you DO need a rescue disk. Unless Debian has the option of upgrading the kernel to a 5.x series kernel which hopefully isn't patched to hell and back? This looks like the classic "I'm running ubuntu with a franken-kernel and raid administration no longer works" problem. I'm guessing (an educated "probably right" guess) that your reshape has hung at 0% complete. So the fix is to get your rescue disk, use the latest mdadm to do a revert-reshape, then use the latest kernel and mdadm to do the reshape, before booting back in to your old Debian and carrying as if nothing had happened. Cheers, Wol
