On Mon, Dec 09, 2013 at 10:28:11AM +0000, Joe Thornber wrote: >> Well, first of all, it doesn't compile, since you use typename outside of >> templates :-) Fixing that is easy, though. But afterwards: > Grr, I thought that was fixed, what version of g++ are you using? This is an Ubuntu 10.04 live CD, which was what I was having handy. It works fine in a Debian wheezy live CD (which I switched to later). >> So where do I want to go from there? cache_dump doesn't want to play with the >> superblock because the checksum is bad... do I want cache_repair, then? Do I >> want to take a backup of anything first? > Ouch. Could you go through what happened please? Did dm-cache crash, > or did the machine die for some other reason? The machine hung. I don't know entirely why (I don't have the logs). I rebooted, and it refused to take up the volume (this is what the original post in this message is about). After booting to a live CD and running cache_check and cache_dump, I was convinced there were no dirty blocks, so I nuked the entire metadata volume (using dd from /dev/zero). This made the machine boot again, but with tons of filesystem errors on anything I'd written to in the last few months, so I restored from backup (thankfully I do have working backups!). I also upgraded to 3.13-rc3 in the hopes of fixing whatever issue in 3.12 originally caused this; however, as reported in the other thread, this was notoriously unstable, and after the third crash, I was back into the “won't boot, but cache_check says everything is fine” mode. That's the current status; it's now standing in a live CD and not doing much useful. I miss my machine :-) (And I hope I haven't lost data again.) Will it help if I upload a dump of the 512MB metadata volume somewhere? /* Steinar */ -- Homepage: http://www.sesse.net/ -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
