[linux-lvm] LVM/Devicemapper kernel level breakage?
Sven Eschenberg
sven at whgl.uni-frankfurt.de
Sun Jul 18 19:18:13 UTC 2010
Hi list, I am having difficulties with one of my boxes.
Mainly this:
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
2262 root 20 0 0 0 0 R 25 0.0 836:51.10 flush-253:2
2363 root 20 0 0 0 0 R 25 0.0 838:28.16 flush-253:6
2364 root 20 0 0 0 0 R 25 0.0 916:14.92 flush-253:4
2365 root 20 0 0 0 0 R 25 0.0 855:02.50 flush-253:1
2362 root 20 0 0 0 0 R 23 0.0 916:14.92 flush-253:5
3090 root 20 0 0 0 0 R 23 0.0 853:27.24 flush-253:3
I was wondering what these flush processes are, I could determine they are
kernel based threads (as far as I can see).
Since they are called flush, I'd asume they have to do with flushing
buffers or whatsoever, so I came to the conclusion, that the numbers might
be major:minor pairs.
Using lvs, I get:
LV KMaj KMin
Root 253 1
home 253 3
var 253 2
usr 253 5
usr.portage 253 4
www 253 6
And I certainly do not believe that there should be flush proceses hogging
the CPU 24/7, and al those threads belong to logical volumes, or devie
mapper devices (there are more, with a little les cpu time created by
kpartx).
Is this a known bug? Any recommendation what to do?
Regards
-Sven
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