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extCache.io.writeErrorおよびinsert_reject_throttle_ioによるディスク遅延

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Category:
ontap-9
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perf
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環境

  • ONTAP 9
  • NVMeベースのFlash Cacheを搭載したAll FAS システム

問題

  • Disk 遅延センターのレイテンシが増加しました
cluster01::> qos statistics volume latency show -vserver vserver01 -volume volume01
Workload       ID   Latency   Network   Cluster    Data    Disk   QoS Max   QoS Min    NVRAM    Cloud  FlexCache   SM Sync     VA
--------------- ------ ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
-total-        -   24.06ms  104.00us   53.00us  556.00us   23.35ms     0ms     0ms   3.00us     0ms     0ms     0ms     0ms
volume01-wid51230   51230   22.49ms  104.00us   52.00us  526.00us   21.81ms     0ms     0ms   3.00us     0ms     0ms     0ms     0ms
-total-        -   13.60ms  143.00us   60.00us  188.00us   13.21ms     0ms     0ms   2.00us     0ms     0ms     0ms     0ms
volume01-wid51230   51230   13.19ms  143.00us   59.00us  185.00us   12.80ms     0ms     0ms   2.00us     0ms     0ms     0ms     0ms
  • 複数のイベント
wafl_exempt09: ems.engine.suppressed:debug]: Event 'extCache.io.writeError' suppressed 67626 times in last 601 seconds.
wafl_exempt09: extCache.io.writeError:notice]: WAFL external cache I/O write error: Insertq_save: unable to set up context chain, code 0
  • FlashCacheは挿入されなくなりました
cluster01::> node run -node node02 stats show -p flexscale-access
Cache                        Reads    Writes    Disk Reads
Usage   Hit  Meta  Miss Hit Evict Inval Insert Chain Blocks Chain Blocks  Replaced
%   /s   /s   /s  %   /s   /s   /s   /s   /s   /s   /s     /s
45   703   11  39171  1   0   0    0   0    0   0    0    109
45   320   26  37607  0   0   0    0   0    0   0    0     98
45   903   51  38018  2   0   0    0   0    0   0    0    114
  • リブートすると一時的に修正されます

 

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