On 29/11/11 14:31, Kent Overstreet wrote:
I need to use this :
for i in /dev/sd? /dev/md* ; do [ -n "`/sbin/probe-bcache $i`" ]&&
echo $i> /sys/fs/bcache/register_quiet ; done
Now, it does not actually need the test in there, however that stops
it spewing "write error: Invalid argument" onto the console when you
echo a device that does not have a bcache superblock.
It does NOT like you accidentally trying to register a device twice :
Eesh. That's annoying.
I suppose really the bcache symlink in the /sys/block/bcacheN directory
is incorrect - without that stacking _ought_ to work and I'm not sure
it's possible to reliably detect stacking anyways.
I'm not sure that stacking is the issue. I simply did
echo /dev/md10 > /sys/fs/bcache/register
echo /dev/md10 > /sys/fs/bcache/register
at that point it all came crashing down. I'd have thought simply
detecting that a particular device was already registered would solve
the problem.
Very annoying though - that symlink is very handy. Argh.
hm. maybe I could check the make_request_fn to detect stacking and
prevent it that way...
No other issues, I take it?
Well, I had intended to run some tests with it stacked on top of md, but
as I pointed out in the last oops in my prior mail, every time I try and
attach the cache set to /dev/md10 the machine panics, so I've not really
progressed to actually trying things out. I figured re-running the tests
I'd already run with it stacked on a single drive was pretty pointless.
Regards,
Brad
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