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启用了闪存读取缓存的卷上的E系列读取延迟降级

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适用场景

  • NetApp E 系列
  • NetApp StorageGRID设备(SG6060)
  • 使用闪存读取缓存(Frc)的单控制器和双控制器存储阵列系统
  • SANtricity OS 11.70.4+

问题描述

  • 升级到SANtricity OS 11.70.4或更高版本后,启用了闪存读取缓存( Frc )的卷上的读取延迟较高。
  • 在E系列支持数据或控制器Shell中、此命令 tditlnall 3 显示卷(LUN ID)读取和写入I/O延迟。将延迟与11.70.4之前的版本进行比较、 平均延迟从亚毫秒级增加到多毫秒级。

11.70.4之前的SANtricity操作系统

-> tditlnall 3
Read/Write Completions
.........TDITLN.........:Initiator.:.................R E A D S................:...............W R I T E S................:
  tditn LUN LU(SSID) Ch : Location :  #Success ByteXfered ART(uSec) MRT(uSec) :  #Success ByteXfered ART(uSec) MRT(uSec) :#Errs
------- --- -------- -- :--------- :---------- ---------- --------- --------- :---------- ---------- --------- --------- :-----
    4 253 00000004  2 :0x1000001 :  17247959 477464117248     235   664446 :   933375 48351206400    1735   1128777 :   0
    6 253 00000004  3 :0x1000001 :  17224923 476861496320     236   647369 :   924492 48300143104    1780   1226118 :   0

11.70.4+ SANtricity操作系统
      
-> tditlnall 3
Read/Write Completions
.........TDITLN.........:Initiator.:.................R E A D S................:...............W R I T E S................:
  tditn LUN LU(SSID) Ch : Location :  #Success ByteXfered ART(uSec) MRT(uSec) :  #Success ByteXfered ART(uSec) MRT(uSec) :#Errs
------- --- -------- -- :--------- :---------- ---------- --------- --------- :---------- ---------- --------- --------- :-----
    4 253 00000004  4 :0x1000001 :  17167803 463487405056    9150   2510841 :   1038936 58143469568     845   1078669 :   0
    6 253 00000004  5 :0x1000001 :  17149289 462841043456    9172   2553690 :   1026237 58029947392     886   1166025 :   0

 

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