[[email protected] ~]#/opt/MegaRAID/MegaCli/MegaCli64 -cfgdsply -aall | grep Policy:
Default Cache Policy: WriteBack, ReadAhead, Cached, No Write Cache if Bad BBU
Current Cache Policy: WriteThrough, ReadAhead, Cached, No Write Cache if Bad BBU
Default Cache Policy: WriteBack, ReadAhead, Cached, No Write Cache if Bad BBU
Current Cache Policy: WriteThrough, ReadAhead, Cached, No Write Cache if Bad BBU
Default Cache Policy: WriteBack, ReadAhead, Cached, No Write Cache if Bad BBU
Current Cache Policy: WriteThrough, ReadAhead, Cached, No Write Cache if Bad BBU
Default Cache Policy: WriteBack, ReadAhead, Cached, No Write Cache if Bad BBU
Current Cache Policy: WriteThrough, ReadAhead, Cached, No Write Cache if Bad BBU
Default Cache Policy: WriteBack, ReadAhead, Cached, No Write Cache if Bad BBU
Current Cache Policy: WriteThrough, ReadAhead, Cached, No Write Cache if Bad BBU
Default Cache Policy: WriteBack, ReadAhead, Cached, No Write Cache if Bad BBU
Current Cache Policy: WriteThrough, ReadAhead, Cached, No Write Cache if Bad BBU
Default Cache Policy: WriteBack, ReadAhead, Cached, No Write Cache if Bad BBU
Current Cache Policy: WriteThrough, ReadAhead, Cached, No Write Cache if Bad BBU
Default Cache Policy: WriteBack, ReadAhead, Cached, No Write Cache if Bad BBU
Current Cache Policy: WriteThrough, ReadAhead, Cached, No Write Cache if Bad BBU
[[email protected] ~]#/opt/MegaRAID/MegaCli/MegaCli64 -LdSetProp WB -Lall -aAll
Learn cycle is active currently
So policy Change to WB will not come into effect immediately
Set Write Policy to WriteBack on Adapter 0, VD 0 (target id: 0) success
Learn cycle is active currently
So policy Change to WB will not come into effect immediately
Set Write Policy to WriteBack on Adapter 0, VD 1 (target id: 1) success
Learn cycle is active currently
So policy Change to WB will not come into effect immediately
Set Write Policy to WriteBack on Adapter 0, VD 2 (target id: 2) success
Learn cycle is active currently
So policy Change to WB will not come into effect immediately
Set Write Policy to WriteBack on Adapter 0, VD 3 (target id: 3) success
Learn cycle is active currently
So policy Change to WB will not come into effect immediately
Set Write Policy to WriteBack on Adapter 0, VD 4 (target id: 4) success
Learn cycle is active currently
So policy Change to WB will not come into effect immediately
Set Write Policy to WriteBack on Adapter 0, VD 5 (target id: 5) success
Learn cycle is active currently
So policy Change to WB will not come into effect immediately
Set Write Policy to WriteBack on Adapter 0, VD 6 (target id: 6) success
Learn cycle is active currently
So policy Change to WB will not come into effect immediately
Set Write Policy to WriteBack on Adapter 0, VD 7 (target id: 7) success
Exit Code: 0x00
[[email protected] ~]#/opt/MegaRAID/MegaCli/MegaCli64 -cfgdsply -aall | grep Policy:
Default Cache Policy: WriteBack, ReadAhead, Cached, No Write Cache if Bad BBU
Current Cache Policy: WriteThrough, ReadAhead, Cached, No Write Cache if Bad BBU
Default Cache Policy: WriteBack, ReadAhead, Cached, No Write Cache if Bad BBU
Current Cache Policy: WriteThrough, ReadAhead, Cached, No Write Cache if Bad BBU
Default Cache Policy: WriteBack, ReadAhead, Cached, No Write Cache if Bad BBU
Current Cache Policy: WriteThrough, ReadAhead, Cached, No Write Cache if Bad BBU
Default Cache Policy: WriteBack, ReadAhead, Cached, No Write Cache if Bad BBU
Current Cache Policy: WriteThrough, ReadAhead, Cached, No Write Cache if Bad BBU
Default Cache Policy: WriteBack, ReadAhead, Cached, No Write Cache if Bad BBU
Current Cache Policy: WriteThrough, ReadAhead, Cached, No Write Cache if Bad BBU
Default Cache Policy: WriteBack, ReadAhead, Cached, No Write Cache if Bad BBU
Current Cache Policy: WriteThrough, ReadAhead, Cached, No Write Cache if Bad BBU
Default Cache Policy: WriteBack, ReadAhead, Cached, No Write Cache if Bad BBU
Current Cache Policy: WriteThrough, ReadAhead, Cached, No Write Cache if Bad BBU
Default Cache Policy: WriteBack, ReadAhead, Cached, No Write Cache if Bad BBU
Current Cache Policy: WriteThrough, ReadAhead, Cached, No Write Cache if Bad BBU
raid卡進入學習週期。以上是手動執行megacli命令查詢到的結果。
lsi megaraid每過一段時間（一般爲1個月或3個月）進行放電和充電一次，進行電池校準以延長電池的使用壽命。
每次學習週期時間的長短要看電池充放電的速度，一般幾個小時到幾十個小時不等。
在學習週期期間raid卡會自動將緩存策略設置爲WriteThrough, ReadAhead, Cached, No Write Cache if Bad BBU，並且不能被設置成WriteBack，會導致性能有所下降。
使用lich.node --disk_check --cache 會打印Learn cycle is active
currently，So policy Change to WB will not come into effect
immediately（目前是學習週期，設置可能暫時不會生效）
crontab 中自動執行的 lich.node --disk_check
--cache則會在/opt/mds/log/disk_cache.log中記錄Learn cycle is active
currently，So policy Change to WB will not come into effect immediately
使用lich.node --disk_check --json查看時會有一個cache_stat字段 標示爲：“Learn” .其它情況暫時標示爲“Unknow”