由于 LUN 上的延迟较长，备份速度较慢

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适用场景

SAN
ONTAP 9
Red Hat Enterprise Linux (RHEL) 6.7

问题描述

备份期间， LUN 上的延迟显示为峰值，达到 50 毫秒。
一个节点上的卷 /LUN 由其配对节点访问

multipath -ll 从 Linux 主机显示硬件处理程序为 "0" ，并且路径不按优先级分组

[root@linux ~]# multipath -ll mpathaf (3600a09803831457544245248xxxxxxxx) dm-8 NETAPP,LUN C-Mode size=500G features='0' hwhandler='0' wp=rw |-+- policy='round-robin 0' prio=1 status=active | `- 12:0:0:8 sdh 8:112 active ready running |-+- policy='round-robin 0' prio=1 status=enabled | `- 12:0:1:8 sdo 8:224 active ready running |-+- policy='round-robin 0' prio=1 status=enabled | `- 12:0:2:8 sdv 65:80 active ready running `-+- policy='round-robin 0' prio=1 status=enabled `- 12:0:3:8 sdac 65:192 active ready running