[DRBD-user] DRBD troubleshooting

ewen fortune ewen.fortune at gmail.com
Thu Feb 26 19:03:48 CET 2009


Hi,

I was wondering if someone could point me in the right direction for
trouble shooting IO issues.

Basically I was looking at a box with IO wait reflected in vmstat,
iostat shows the underlying devices are not saturated or experiencing
high wait or service times.

I am guessing that I can verify DRBD health by looking at the values
from /proc/drbd.

pe (pending). Number of requests sent to the partner, but that have
not yet been answered by the latter.
#

ua (unacknowledged). Number of requests received by the partner via
the network connection, but that have not yet been answered.
#

ap (application pending). Number of block I/O requests forwarded to
DRBD, but not yet answered by DRBD

These look pretty interesting, am I on the right track?.

Thanks,

Ewen



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