[DRBD-user] DRBD V8.4.2 Re-sync after service migration takes long time

Matchett, John jmatch01 at harris.com
Thu Feb 14 16:51:30 CET 2013

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


My configuration is Pri/Pri  DRBD Cluster with GFS2/CLVM  and Postgres/Zabbix    If I kill my Active node,  the  Standby node migrates services  quickly and becomes the new Active Node.  However, once the old Active node reboots as a new Standby  node,  it takes 5-7 minutes to re-sync the DRBD partition.    .


If only  the   Standby node reboots and there is no service migration,  the Re-sync  only takes a few seconds.  Why does the resync take longer following a service migration to standby node  vs when there's no service migration with only the standby recovery?



I did notice the size of the resync 29M  is smaller with just a Standby node restart than it is when the Primary is killed, and restarts as Standby (4G)


brw-rw---- 1 root disk 8, 3 Feb 14 05:02 /dev/sda3
[root at lm01.mco-p.atct ~]# df
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/mapper/vg_00-LV_Root
                      20158332   7412924  11721408  39% /
tmpfs                  8158040     32044   8125996   1% /dev/shm
/dev/sda1               495844     54492    415752  12% /boot
/dev/mapper/vg_00-LV_Var
                      18138440   9707304   7509744  57% /var
/dev/sda3            100791728  73605568  22066160  77% /vm
/dev/mapper/postgres_vg-postgres_lv
                     343925920  24288868 319637052   8% /var/lib/pgsql



- JM












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