On Fri, Jun 06, 2014 at 11:45:49AM +0200, Otto Moerbeek wrote: > Hi, > > I have an PERC 6/i Integrated adapter here: > > mfi0 at pci2 dev 0 function 0 "Symbios Logic SAS1078" rev 0x04: apic 1 int 0 > mfi0: "PERC 6/i Integrated", firmware 6.2.0-0013, 256MB cache > > Which has an OK battery but still reports itself as being in WT mode: > > # sysctl hw.sensors.mfi0.indicator0 > hw.sensors.mfi0.indicator0=On (bbu ok), OK > > # bioctl mfi0 mfi0 | head -2 > Volume Status Size Device > mfi0 0 Online 249376538624 sd0 RAID1 WT >
Was this RAID volume previously in WB mode? Is it possible that you've simply configured it for WT? > > Now I cam across this in the relase notes of firmware 6.3.3-0002: > > 12. All RAID volumes will be presented as write through (WT) to the operating > system (Windows and linux) independent of the actual write cache policy of > the virtual disk. The controller manages the data in cache independently > of > the OS and any applications. Please use OpenManage or the BIOS > Configuration Utility to view and manage virtual disk cache settings. > I believe this is referring to the caching mode page of the virtual disk as seen by the SCSI subsystem. Specifically the WCE bit would be set to 0. It doesn't sound like a change to the underlying actual write policy. Are you willing to try the 6.3.3-0002 firmware? This release has some changes to address how the remaining capacity of the battery was calculated and handled, both when determining whether there was sufficient remaining capacity for keeping the drives in WB and how the controller handles its internal battery learning cycle (which, BTW, can trigger a period of time where the drives go WT because the process intentionally drains the battern down and recharges). > So what's the status of this WT/WB flag? Can't it be trusted for PERC > 6/i and maybe other adapters? If so, a man page blurp would be needed > imo. > > -Otto > > > > >
