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仅使用板载 SAS 时的顺序读取工作负载延迟较高 端口

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Category:
ontap-9
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perf
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适用场景

  • AFF 80 x 0
  • ONTAP 9
  • IOM 6
  • SAS 适配器 PMC-Sierra PM8001 和 PM8072

问题描述

  • 在顺序读取工作负载高峰期间观察到 SSD 的高延迟。
  • EMS 可能会报告如下错误:

[?] Thu Aug 13 20:55:55 EDT [AFF80x0: pmcsas_timeout_1: sas.device.quiesce:debug]: Adapter 0c encountered a command timeout on enclosure services device 0d.01.99. Quiescing the device[?] Thu Aug 13 20:55:58 EDT [AFF80x0: pmcsas_timeout_1: sas.device.timeout:error]: Adapter 0c encountered a device timeout on Enclosure services device 0d.01.99.
[?] Thu Aug 13 20:55:58 EDT [AFF80x0: pmcsas_timeout_1: sas.adapter.debug:info]: params: {'debug_string': 'Level 0 timeout on virtual device: Hard resetting PHY: 0d.01.99 (0xfffff820aaab0040,0x1c,0/0)', 'adapterName': '0c'}
[?] Thu Aug 13 20:55:58 EDT [AFF80x0: scsi_cmdblk_strthr_admin: scsi.cmd.abortedByHost:error]: Enclosure services device 0d.01.99: Command aborted by host adapter: HA status 0x4: cdb 0x1c.

 

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