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COTP-377578:SAS驱动器报告未就绪状态可能会导致发生原因客户端IO延迟较高

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问题描述

如果SAS驱动器返回未就绪状态的IO、则ONTAP会不断重试此IO、以等待此驱动器就绪。在某些情况下、驱动器可能需要很长时间才能准备就绪、这可能会导致客户端IOS出现长时间的等待。出现这种情况的原因是、发生此IO状态时、ONTAP不会临时使驱动器从RAID组脱机。
EMS日志:
[?]  Mon Oct 21 08:38:25 +0900 [node1: scsi_cmdblk_strthr_admin: scsi.cmd.notReadyCondition:notice]: Disk device 0d.16.1: Device returns not yet ready: CDB 0x28:628b3180:0008: Sense Data SCSI:not ready - Drive spinning up (0x2 - 0x4 0x1 0x0)(5970).
注:2/4/1 (0x2 - 0x4 0x1 0x0) 是标准SCSI检查条件。它表示逻辑单元正在准备就绪。
这也可能会像EMS日志中观察到的那样使用发生原因Long CPS:
Mon Oct 21 08:40:21 +0900 [node1: wafl_exempt07: wafl.cp.toolong:error]: Aggregate aggr1 experienced a long CP.

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