On 15/10/19 00:56, Curtis Vaughan wrote: > I have reason to believe one HD in a RAID1 is dying. But I'm trying to > understand what the logs and results of various commands are telling me. > Searching on the Internet is very confusing. BTW, this is for and Ubuntu > Server 18.04.2 LTS. Ubuntu LTS ... hmmm. What does "mdadm --version" tell you? > > It seems to me that the following information is telling me on device is > missing. It would seem to me that sda is gone. Have you got any diagnostics for sda? Is it still in /dev? has it been kicked from the system? Or just the raid? Take a look at https://raid.wiki.kernel.org/index.php/Linux_Raid#When_Things_Go_Wrogn Especially the "asking for help" page. It gives you loads of diagnostics to run. Basically, we need to know whether sda has died, or whether it's a problem with raid (especially with older mdadm, like I suspect you may have, the problem could lie there). > > Anyhow, for example, I received an email: > > A DegradedArray event had been detected on md device /dev/md0. Do you have a spare drive to replace sda? If you haven't, it might be an idea to get one - especially if you think sda might have failed. In that case, fixing the raid should be pretty easy. So long as fixing it doesn't tip sdb over the edge ... > > Faithfully yours, etc. > Cheers, Wol
