如何启动惠普阵列卡的Drive Write Cache

平时一直没注意，一直以为插了电池以后，阵列卡写缓存就是启动的
突然有同事问我
Drive Write Cache: Disabled
然后我就纳闷了，不是一插电池，写缓存就启用么，为什么Drive Write Cache还是禁用的

查询半天资料，终于搞清楚了

参考

Re: How to activate write cache on P400 Smart Controller
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?01-02-2011 10:06 AM

The BBWC in the controller ***DOES NOT*** protect the disk drive's cache memory !!!!!
That can only be done by a UPS external to the server and even then *I* would not enable DWC.

The BBWC in the controller ***DOES NOT*** protect the disk drive's cache memory !!!!!
That can only be done by a UPS external to the server and even then *I* would not enable DWC.

What does the BBWC do then?
"That can only be done by a UPS external to the server and even then *I* would not enable DWC."
The server is connected to a UPS. How do I enable the drive write cache?

The BBWC does protect the cache memory within the controller module.

Thanks. Any suggestions on how to enable the drive write cache?

I've never looked into this, sorry.
I beleive it is an error to enable it in a production environment. The risks are greatly increased, because a complete server (with its embedded drives) can much easier experience a power failure.
If the BBWC goes bad, the SmartArray controller goes into write-through mode. If somebody accidently turns off the server (or must do it because it has locked up) - the data in the DWC is gone!! There is NO way to notify the disk drives about an emergency to flush their cache!

I solved with that command
hpacucli controller slot=0 logicaldrive 1 modify arrayaccelerator=enable
In my server I have logicaldrive 1 running on slot 0

简单来说Drive Write Cache和阵列卡缓存是两个东西
阵列卡写缓存会在接上电池后自动启用，阵列卡中的无电池写缓存设置是针对阵列卡写缓存的

Drive Write Cache 是硬盘自己的写缓存，由于硬盘是没有专门的供电电池，异常断电没设备给硬盘提供写入的供电。
所以默认硬盘写缓存都是关闭的且不推荐开启的！

所以这篇文章的第一行话是正确的