DL380 Gen9 ADU报错The cache is temporarily disabled解决方法

客户新安装 DL380 Gen9 配置P440ar 阵列卡，发现硬盘读写性能很差.

察看ADU日志，发现日志中有以下报错信息

Device Summary:
   Smart Array P440ar in Embedded Slot

Consolidated Error Report:
   Controller: Smart Array P440ar in Embedded Slot
      Message: The cache is temporarily disabled.

Cache disabled 导致硬盘读写性能下降

在HPE新出的最新P440ar的固件版本的解决问题中，有以下描述

The Smart Array controller cache module might be marked as permanently disabled if the Smart Storage Battery is removed or failed while the system is online, even if the Smart Storage Administrator Utility (SSA) was previously used to enable write caching without a backup power source.

相关下载链接和安装方法见下：

https://h20565.www2.hpe.com/hpsc/swd/public/detail?sp4ts.oid=7271242&swItemId=MTX_3530a4eb927b477d9db4c44fa8&swEnvOid=4168#tab2

在本案例中，在将P440ar固件从4.52升级到5.52后，重启问题解决.

建议在实际遇到H24X,P44X,P84X等阵列卡ADU中有以下报错"The cache is temporarily disabled."建议先查看阵列卡版本,如果低于5.52的版本,建议先升级固件,在升级后如果问题还是无法解决,再行更换陈列卡缓存，阵列卡电池等相关硬件