linux – 堆叠站点上的DRBD磁盘drbd10上的I / O高

我们有4个Redhat Box Dell PowerEdge R630(比如a,b,c,d)具有以下操作系统/软件包.

RedHat EL 6.5 MySql Enterprise 5.6 DRBD 8.4 Corosync 1.4.7

我们设置了4路堆叠drbd资源,如下所示：

群集群集-1：服务器a和b彼此连接本地lan群集群集-2：服务器c和d

Cluster Cluster-1和Cluster-2通过堆叠drbd通过虚拟IP连接,是不同数据中心的一部分.

drbd0磁盘已在每台服务器1GB上本地创建,并进一步连接到drbd10.

整体设置包括4层：Tomcat前端应用 – > rabbitmq – > memcache – > MySQL的/ DRBD

我们正在经历非常高的磁盘IO,即使活动也不是必须的.但是流量/活动将在几周内增加,因此我们担心它会对性能造成非常不利的影响. I / O使用率仅在堆叠的站点上高(有时为90％及以上).辅助站点没有这个问题.当应用程序理想时,使用率很高.

所以请分享一些建议/调整指南,以帮助我们解决问题;

resource clusterdb {
protocol C;
handlers {
pri-on-incon-degr "/usr/lib/drbd/notify-pri-on-incon-degr.sh; /usr/lib/drbd/notifyemergency-reboot.sh; echo b > /proc/sysrq-trigger ; reboot -f";
pri-lost-after-sb "/usr/lib/drbd/notify-pri-lost-after-sb.sh; /usr/lib/drbd/notifyemergency-reboot.sh; echo b > /proc/sysrq-trigger ; reboot -f";
local-io-error "/usr/lib/drbd/notify-io-error.sh; /usr/lib/drbd/notify-emergencyshutdown.sh; echo o > /proc/sysrq-trigger ; halt -f";
fence-peer "/usr/lib/drbd/crm-fence-peer.sh";
}
startup {
degr-wfc-timeout 120; # 2 minutes.
outdated-wfc-timeout 2; # 2 seconds.
}
disk {
on-io-error detach;
no-disk-barrier;
no-md-flushes;
}

net {
cram-hmac-alg "sha1";
shared-secret "clusterdb";
after-sb-0pri disconnect;
after-sb-1pri disconnect;
after-sb-2pri disconnect;
rr-conflict disconnect;
}

syncer {
rate 10M;
al-extents 257;
 on-no-data-accessible io-error;
 }

 on sever-1 {
 device /dev/drbd0;
 disk /dev/sda2;
 address 10.170.26.28:7788;
 meta-disk internal;
 }
 on ever-2 {
 device /dev/drbd0;
 disk /dev/sda2;
 address 10.170.26.27:7788;
 meta-disk internal;
 }
}

堆叠配置： –

resource clusterdb_stacked {
  protocol A;
handlers {
pri-on-incon-degr "/usr/lib/drbd/notify-pri-on-incon-degr.sh; /usr/lib/drbd/notifyemergency-reboot.sh; echo b > /proc/sysrq-trigger ; reboot -f";
pri-lost-after-sb "/usr/lib/drbd/notify-pri-lost-after-sb.sh; /usr/lib/drbd/notifyemergency-reboot.sh; echo b > /proc/sysrq-trigger ; reboot -f";
local-io-error "/usr/lib/drbd/notify-io-error.sh; /usr/lib/drbd/notify-emergencyshutdown.sh; echo o > /proc/sysrq-trigger ; halt -f";
fence-peer "/usr/lib/drbd/crm-fence-peer.sh";
}
startup {
degr-wfc-timeout 120; # 2 minutes.
outdated-wfc-timeout 2; # 2 seconds.
}
disk {
on-io-error detach;
no-disk-barrier;
no-md-flushes;
}

net {
cram-hmac-alg "sha1";
shared-secret "clusterdb";
after-sb-0pri disconnect;
after-sb-1pri disconnect;
after-sb-2pri disconnect;
rr-conflict disconnect;
}

syncer {
rate 10M;
al-extents 257;
 on-no-data-accessible io-error;
 }

  stacked-on-top-of clusterdb {
    device     /dev/drbd10;
    address   10.170.26.28:7788;
  }
 stacked-on-top-of clusterdb_DR {
    device     /dev/drbd10;
    address    10.170.26.60:7788; 
  }
}

请求的数据： –

Date || svctm(w_wait)|| %util
10:32:01 3.07 55.23 94.11
10:33:01 3.29 50.75 96.27
10:34:01 2.82 41.44 96.15
10:35:01 3.01 72.30 96.86
10:36:01 4.52 40.41 94.24
10:37:01 3.80 50.42 83.86
10:38:01 3.03 72.54 97.17
10:39:01 4.96 37.08 89.45
10:41:01 3.55 66.48 70.19
10:45:01 2.91 53.70 89.57
10:46:01 2.98 49.49 94.73
10:55:01 3.01 48.38 93.70
10:56:01 2.98 43.47 97.26
11:05:01 2.80 61.84 86.93
11:06:01 2.67 43.35 96.89
11:07:01 2.68 37.67 95.41

根据评论更新问题： –

它实际上是比较本地和堆叠.

本地服务器之间

[root@pri-site-valsql-a]#ping pri-site-valsql-b
PING pri-site-valsql-b.csn.infra.sm (10.170.24.23) 56(84) bytes of data.
64 bytes from pri-site-valsql-b.csn.infra.sm (10.170.24.23): icmp_seq=1 ttl=64 time=0.143 ms
64 bytes from pri-site-valsql-b.csn.infra.sm (10.170.24.23): icmp_seq=2 ttl=64 time=0.145 ms
64 bytes from pri-site-valsql-b.csn.infra.sm (10.170.24.23): icmp_seq=3 ttl=64 time=0.132 ms
64 bytes from pri-site-valsql-b.csn.infra.sm (10.170.24.23): icmp_seq=4 ttl=64 time=0.145 ms
64 bytes from pri-site-valsql-b.csn.infra.sm (10.170.24.23): icmp_seq=5 ttl=64 time=0.150 ms
64 bytes from pri-site-valsql-b.csn.infra.sm (10.170.24.23): icmp_seq=6 ttl=64 time=0.145 ms
64 bytes from pri-site-valsql-b.csn.infra.sm (10.170.24.23): icmp_seq=7 ttl=64 time=0.132 ms
64 bytes from pri-site-valsql-b.csn.infra.sm (10.170.24.23): icmp_seq=8 ttl=64 time=0.127 ms
64 bytes from pri-site-valsql-b.csn.infra.sm (10.170.24.23): icmp_seq=9 ttl=64 time=0.134 ms
64 bytes from pri-site-valsql-b.csn.infra.sm (10.170.24.23): icmp_seq=10 ttl=64 time=0.149 ms
64 bytes from pri-site-valsql-b.csn.infra.sm (10.170.24.23): icmp_seq=11 ttl=64 time=0.147 ms
^C
--- pri-site-valsql-b.csn.infra.sm ping statistics ---
11 packets transmitted,11 received,0% packet loss,time 10323ms
rtt min/avg/max/mdev = 0.127/0.140/0.150/0.016 ms

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