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SVM DR 初始化期间出现高延迟

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适用场景

  • ONTAP 9
  • SVM 灾难恢复
  • 性能

问题描述

  • SVM DR SnapMirror 初始化已启动
  • 一段时间后,我们会发现,虚拟机无响应, ESXi 服务器上出现高延迟
  • QoS 统计信息表明,大多数延迟是由于磁盘造成的

cluster::> qos statistics volume latency show -vserver svm_lv_esx -volume LV_ESX_01
Workload            ID    Latency    Network    Cluster       Data       Disk    QoS Max    QoS Min      NVRAM      Cloud  FlexCache    SM Sync         VA
--------------- ------ ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
-total-              -    23.71ms    81.00us    44.00us     5.56ms    18.01ms        0ms        0ms    12.00us        0ms        0ms        0ms        0ms
LV_ESX_01-wid..  57540   100.60ms    65.00us        0ms   208.00us   100.33ms        0ms        0ms     2.00us        0ms        0ms        0ms        0ms
-total-              -    18.64ms    81.00us    56.00us     4.75ms    13.74ms        0ms        0ms    15.00us        0ms        0ms        0ms        0ms
LV_ESX_01-wid..  57540    73.35ms   207.00us        0ms   114.00us    73.02ms        0ms        0ms    14.00us        0ms        0ms        0ms        0ms

  • 对磁盘统计信息进行审核,发现所有磁盘均已 100% 利用,并且大部分都是读取

cluster::> system node run -node <node>

node> statit -b

(wait a 30 seconds)

node> statit -e

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