… Same thing — write-through, battery charging. And the battery backup unit was set to run through auto-learn cycles periodically, which is generally the factory default (these are Dells, with PERC / LSI MegaRAID controllers.) I …
Comment: RAID System performance surprises
March 5, 2008 By 7 Comments
… the command which tells when next Learn cycle to be: [root@DB01 ~]# omreport storage battery controller=0 Battery 0 on Controller PERC 5/i… : Battery 0 State : Ready Recharge Count : Not Applicable Max Recharge Count : Not Applicable Predicted Capacity Status : Ready Learn State : Idle Next Learn Time…: http://www.lsi.com/storage_home/products_home/internal_raid/megaraid_sas/megaraid_sas_8408e/index.html?remote=1
Post: RAID System performance surprises
March 5, 2008 By 7 Comments
… MegaRaid) – Pretty typical controller from Dell installed on PowerEdge 1950, 2950 etc you should be aware of couple of things Battery Learning and Charging Build in Battery has to pass through learning cycle every 3 months or so and this cycle takes about…
Post: How Percona does a MySQL Performance Audit
November 24, 2008 By 17 Comments
…get elsewhere. If I see an LSI MegaRAID card, which is pretty common, I … also get information about the all-important battery-backed write cache, how it’s …option in the file. But again, you learn quickly if something strange is here. …That way there’s at least one “cycle” of queries in it. Then I run…
