Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
On Thu, Feb 26, 2009 at 07:03:48PM +0100, ewen fortune wrote: > 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?. yes, go ahead. btw, with kernels >= 2.6.16 (and, with current drbd git also for >= 2.6.28) iostat should also work for DRBD. -- : Lars Ellenberg : LINBIT | Your Way to High Availability : DRBD/HA support and consulting http://www.linbit.com DRBD® and LINBIT® are registered trademarks of LINBIT, Austria. __ please don't Cc me, but send to list -- I'm subscribed