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由于需要更新磁盘固件、SSD延迟高于预期

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适用场景

  • ONTAP 9
  • AFF

问题描述

  • 在极少数情况下、全闪存FAS (AFF)存储控制器在磁盘层的延迟数可能会高于预期。
  • statit 可以在命令输出或 qos statistics volume latency show 命令输出中观察到延迟大于预期。

示例

  • qos statistics volume latency show 显示磁盘延迟的命令输出:

cluster::> qos statistics volume latency show
Workload            ID  Latency    Network  Cluster       Data     Disk  Qos Max    Qos Min      NVRAM
--------------- ------ --------   -------- --------   -------- -------- -------- ---------- ----------
-total-                 10.35ms     1.35ms      0ms        0us     9ms      0ms        0ms        0ms
vs1vol0            111  17.23ms        0us      0ms   603.00us  16.63ms      0ms        0ms        0ms
vol1              1234  17.76ms        0ms      0ms   150.00us  17.61ms      0ms        0ms        0ms
vol2               999   4.24ms        0us      0ms   190.00us   4.05ms      0ms        0ms        0ms

Cluster::> set -privilege diag Warning: These diagnostic commands are for use by NetApp personnel only. Do you want to continue? {y|n}: y Cluster::*> statistics start -object disk -counter "io_queued|io_pending" Statistics collection is being started for sample-id: sample_148 Cluster::*> statistics show -filter "io_queued>10|io_pending>10" Object: disk Instance: 0d.23.13 Start-time: 12/5/2022 16:48:26 End-time: 12/5/2022 16:51:58 Elapsed-time: 212s Scope: node1 Number of Constituents: 1 (complete_aggregation) Counter Value -------------------------------- -------------------------------- io_queued 19 io_pending 8 ... Cluster::*> node run -node node1 -command statit -b Cluster::*> node run -node node1 -command statit -e Disk Statistics (per second) ut% is the percent of time the disk was busy. xfers is the number of data-transfer commands issued per second. xfers = ureads + writes + cpreads + greads + gwrites chain is the average number of 4K blocks per command. usecs is the average disk round-trip time per 4K block. disk ut% xfers ureads--chain-usecs writes--chain-usecs cpreads-chain-usecs greads--chain-usecs gwrites--chain-usecs /data_aggr1/plex0/rg0: 0c.01.2 80 2510.99 1525.62 5.95 763 389.58 11.11 2682 595.79 5.22 1318 0.00 .... . 0.00 .... . 0c.01.3 81 2502.32 1510.75 5.96 758 393.43 11.27 2706 598.14 5.15 1348 0.00 .... . 0.00 .... . 0c.01.4 81 2518.91 1528.01 5.93 762 392.18 11.45 2661 598.72 5.12 1364 0.00 .... . 0.00 .... . ...

 

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