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 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. 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