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CONAP-118215:SMA计划内故障转移后IO中断或高延迟

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问题描述

在某些采用 SnapMirror 主动同步 (SMas) 功能的 ONTAP 系统中,某些 SMas 源一致性组 (CG) 和卷可能会在其他SMas 关系上执行计划内故障转移操作后出现 I/O 中断。这也可能表现为突然出现 20 秒左右的高延迟。
插图
cg1_src ----- cg1_dst

  • cg1_vol_src ----- cg1_vol_dst

cg2_src ----- cg2_dst
  • cg2_vol_src ----- cg2_vol_dst

当在 cg1_dst 上执行 snapmirror 故障转移命令时,如果 cg1_vol_src 和 cg2_vol_src 位于同一节点上,则属于 cg2 的 cg2_vol_src 可能会面临 IO 中断。
受影响的卷
  • 此缺陷特定于SMAS卷、通常仅限于与正在进行计划内故障转移的CG的源端点位于同一位置的特定卷。
  • 非SMAS卷(例如、SM-S或SM-Async关系中的卷)不受影响。

症状
  • 主机可能会注意到数据读取或写入的高延迟——通常持续约 20 秒的延迟。
  • 主机可能会遇到其他 I/O 中断,或与受影响的一致性组相关的 LUN 完全无法访问。

 

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