On Fri, 23 Oct 2015 at 06:37 Neil Brown <nfbrown@xxxxxxxxxx> wrote: > > Liwei <xieliwei@xxxxxxxxx> writes: > > > Hi list, > > I tried growing a RAID6 array by executing the mdadm --add and > > mdadm --grow --raid-devices commands. Usually that should run fine and > > I can continue with pvresize. > > That is incorrect. You cannot run "pvresize" until the reshape > completes. Ah, my bad. It's been a while since I did that. So if I had been patient, all would have been well? > > > > > > This time however, the actual usable raid array size did not > > change even though reshape begins. In my confusion, I decided to > > reboot. That didn't solve the problem (and apparently the reshape was > > interrupted, but mdadm shows the grown array as clean?) > > Clean is expected. It will be in an intermediate state, part has > reshaped to extra devices, part is still the original. > > > > > I then executed mdadm --grow --size=max, which seemed to have > > increased the array size, but apparently by too much. Now I'm getting > > "attempt to access beyond end of device" errors for each of the > > component drives. A new reshape operation has also begun, which I > > expect would fail as the array size is now too big. > > "--size" isn't the same as "--array-size". > "--size" is the size of the component devices to use. > > The "attempt to access beyond end of device" errors are unexpected but > presumably related o the "--size=max". Maybe the 'max' chosen was too > large. That suggests a bug somewhere. > You probably want to reduce that size back to where it was. I just realised I got the wrong command. I used --array-size=max instead. A reboot seemed to have reverted the change. > > > > > > What did I do wrong and how can I remedy this? > > Could we start with "mdadm --examine" status of all devices, "mdadm > --detail" of the array, and all kernel messages that could possibly > relate to the array since you first started this exercise? Eventually it was a foul up on my part. Things seem to be back to normal after a reboot, and the reshape is in progress. Apologies for the confusion! Liwei > > > NeilBrown > > > > > Liwei > > -- > > 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 -- 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
