On 17 May 2016 at 14:31, Phil Turmel <philip@xxxxxxxxxx> wrote: > See the "Unclean Shutdown" section of "man md". > > The kernel parameter you need is "md_mod.start_dirty_degraded=1". > > Doing this is a really good way to end up with split brain. Why do you > need to regularly boot without the devices that were present at shutdown? Thanks for the md reference. I don't need to regularly boot with devices that were present at shutdown, but this is RAID! Given that it's not a boot device, and frankly even if it was, I would expect the default to be to start up anyway and then to be able to replace the missing device to be an option. Otherwise it removes a lot of the point of resilience. I'll have a look at this further later tonight. The reason it is failing from '-v' is because /dev/sda12 is 'busy'. Looks like I need to read the docs further, I got it to come back up by using stop and assemble, but yes looks like split brain is a thing when I do that. Fortunately I'm not using this for anything important yet - I'm doing this precisely so that I know what to do when a device does fail. Once it's all working I'm going to leave it alone. -- 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
