[DRBD-user] iozone test block on drbd

Mia Lueng xiaozunvlg at gmail.com
Tue May 21 17:51:21 CEST 2013

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

drbd configure :

[root at kvm3 ~]# drbdadm dump drbd0
# resource drbd0 on kvm3: not ignored, not stacked
# defined at /etc/drbd.d/drbd0.res:1
resource drbd0 {
    on kvm3 {
        device           /dev/drbd0 minor 0;
        disk             /dev/vg_kvm3/drbd0;
        meta-disk        internal;
        address          ipv4;
    on kvm4 {
        device           /dev/drbd0 minor 0;
        disk             /dev/vg_kvm4/drbd0;
        meta-disk        internal;
        address          ipv4;
    net {
        protocol           A;
        csums-alg        md5;
        verify-alg       md5;
        ping-timeout      30;
        ping-int          30;
        max-epoch-size   8192;
        max-buffers      8912;
        unplug-watermark 131072;
    disk {
        on-io-error      pass_on;
        disk-barrier      no;
        disk-flushes      no;
        resync-rate      100M;
        c-plan-ahead      20;
        c-delay-target   100;
        c-max-rate       400M;
        c-min-rate        2M;
        al-extents       601;

I run iozone on drbd and it blocks for a long time.

/root/work/iozone/iozone3_414/src/current/iozone -a -i 0 -i 1 -Rb

# cat /proc/drbd
version: 8.4.3 (api:1/proto:86-101)
GIT-hash: 2acb4389deadd704f072570faf373c835c028bb1 build by root at kvm3,
2013-05-08 23:19:24
 0: cs:Connected ro:Primary/Secondary ds:UpToDate/UpToDate A r---n-
    ns:29990400 nr:0 dw:29995024 dr:1393 al:1441 bm:0 lo:0 pe:1156 ua:0
ap:1156 ep:1 wo:d oos:0
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