View Full Version : very slow drbd replication

30-Aug-2017, 14:01
SLES 12 SP2 + online updates.

Its a 1 TB volume with XFS file system and both the nodes are connected via 1 Gbps network. DRBD replication started 41 hours before but it just reached 8.78 %.

drbdsetup status oracle --verbose --statistics
oracle node-id:1 role:Primary suspended:no
volume:0 minor:0 disk:UpToDate
size:1904549052 read:515556707 written:13288947 al-writes:6734 bm-writes:0
upper-pending:0 lower-pending:0 al-suspended:no blocked:no
prdnode2 node-id:0 connection:Connected role:Secondary congested:no
volume:0 replication:SyncSource peer-disk:Inconsistent done:8.78
received:0 sent:176786480 out-of-sync:1737341808 pending:0 unacked:0

Why replication is so slow ?

Also would you advise me to run the following command on SyncTarget node:

drbdadm disk-options --c-plan-ahead=0 --resync-rate=110M oracle

and then later on edit the resource file to add the following:

disk { resync-rate 100M; }

current configuration:

global { usage-count no;}

common {
handlers { fence-peer "/usr/lib/drbd/crm-fence-peer.sh"; after-resync-target "/usr/lib/drbd/crm-unfence-peer.sh"; }

startup { wfc-timeout 0; degr-wfc-timeout 120; }

disk { on-io-error detach; al-extents 3389; }

net { after-sb-0pri discard-zero-changes; after-sb-1pri discard-secondary; max-buffers 8000;
max-epoch-size 8000; sndbuf-size 0; verify-alg md5; ping-int 2; ping-timeout 2; connect-int 2;
timeout 5; ko-count 5; }

resource file:

resource oracle {
device /dev/drbd_r0 minor 0;
meta-disk internal;

on node1 { disk "/dev/sdb2"; address; }

on node2 { disk "/dev/sdb2"; address; }


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04-Sep-2017, 05:30

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