[DRBD-user] Identifying High iowait on DRBD Computers

Robinson, Eric eric.robinson at psmnv.com
Thu Feb 17 07:41:56 CET 2011

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.

While performing a resync, iostat shows that nodeA (primary) is doing
almost all reads while nodeB (secondary) is doing almost all writes,
which is expected. However, I'm trying to see the names of the processes
that are doing the reading and writing. I tried enabling
/proc/sys/vm/block_dump and checking dmesg, but most of what I see in
there is kjournald. Do DRBD processes not show up in kernel debug
output? If not, how do I isolate the source of constant 25-50% iowait on
a computer running DRBD?

Eric Robinson


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