Re: device delete, error removing device [SOLVED]

On Oct 24, 2012, at 12:06 PM, Goffredo Baroncelli [off-list ref] wrote:

quoted

I was able to reproduce it:

- I filled the filesystem until I got "No space left on device".

I didn't even need to get that far.

So it seems that I spread all the data to the other disk, filling up the
smaller ones. So it stuck to "No space left on device".

Now I rebalanced with -dconvert=single, as suggested by Hugo, then I was
able to remove the disk:

Label: 'test2'  uuid: 11d0f1a8-2770-4ff2-8df5-f772f1056edc
	Total devices 3 FS bytes used 7.63GB
	devid    4 size 12.00GB used 9.48GB path /dev/vdf
	devid    3 size 3.00GB used 492.94MB path /dev/vdd
	devid    2 size 3.00GB used 64.00MB path /dev/vdc

It's an interesting solution, but difficult for a larger file system. Or at least, could be very time consuming.

Aside from the "no space left" problem, the 'device delete' behavior itself has kindof a high penalty: a successful 'device delete' on a five disk raid10 (one was added in advance of the delete), all disks are significantly written to, not merely a reconstruction of the replaced disk. It means a lot of writing to do disk removals in the face of an impending disk failure.


Chris Murphy