I have a number of servers with almost identical hardware (Supermicro
MB, Areca 1210 or 1220 RAID card).

These span from OpenBSD 4.5 to 5.0.

In anything before 5.0, I am able to monitor the RAID status via snmp
at OPENBSD-SENSORS-MIB::sensorStatus.  The 5.0 boxes are returning
unknown status (and the device IOD has changed from 3 to 46).

sysctl reports differently in 5.0:

4.9 box (this is same in 4.8):
hw.sensors.arc0.drive0=online (sd0), OK

5.0 box:
hw.sensors.arc0.drive0=unknown (sd0), UNKNOWN

I can't seem to find any mention that I should be doing something
different as of 5.0.  Has something broken?  Do I need to do something
different?

Thanks for any help.

dmesg from 4.9 box:

OpenBSD 4.9 (GENERIC.MP) #819: Wed Mar  2 06:57:49 MST 2011
    dera...@amd64.openbsd.org:/usr/src/sys/arch/amd64/compile/GENERIC.MP
real mem = 3486973952 (3325MB)
avail mem = 3380129792 (3223MB)
mainbus0 at root
bios0 at mainbus0: SMBIOS rev. 2.5 @ 0xcfedf000 (39 entries)
bios0: vendor Phoenix Technologies LTD version "1.2a" date 12/19/2008
bios0: Supermicro X7SBL
acpi0 at bios0: rev 2
acpi0: sleep states S0 S1 S4 S5
acpi0: tables DSDT FACP _MAR TCPA MCFG APIC BOOT SPCR ERST HEST BERT EINJ SLIC 
SSDT SSDT SSDT SSDT SSDT SSDT SSDT SSDT SSDT
acpi0: wakeup devices PEG_(S5) PEX_(S5) LAN_(S5) USB4(S5) USB5(S5) USB7(S5) 
ESB2(S5) EXP1(S5) EXP5(S5) EXP6(S5) USB1(S5) USB2(S5) USB3(S5) USB6(S5) 
ESB1(S5) PCIB(S5) KBC0(S1) MSE0(S1) COM1(S5) COM2(S5) PWRB(S3)
acpitimer0 at acpi0: 3579545 Hz, 24 bits
acpimcfg0 at acpi0 addr 0xe0000000, bus 0-16
acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
cpu0 at mainbus0: apid 0 (boot processor)
cpu0: Intel(R) Xeon(R) CPU E3110 @ 3.00GHz, 2992.88 MHz
cpu0: 
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,SBF,SSE3,MWAIT,DS-CPL,VMX,SMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,SSE4.1,XSAVE,NXE,LONG
cpu0: 6MB 64b/line 16-way L2 cache
cpu0: apic clock running at 332MHz
cpu1 at mainbus0: apid 1 (application processor)
cpu1: Intel(R) Xeon(R) CPU E3110 @ 3.00GHz, 2992.50 MHz
cpu1: 
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,SBF,SSE3,MWAIT,DS-CPL,VMX,SMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,SSE4.1,XSAVE,NXE,LONG
cpu1: 6MB 64b/line 16-way L2 cache
ioapic0 at mainbus0: apid 2 pa 0xfec00000, version 20, 24 pins
acpiprt0 at acpi0: bus 0 (PCI0)
acpiprt1 at acpi0: bus 1 (PEG_)
acpiprt2 at acpi0: bus -1 (PEX_)
acpiprt3 at acpi0: bus 5 (EXP1)
acpiprt4 at acpi0: bus 13 (EXP5)
acpiprt5 at acpi0: bus 15 (EXP6)
acpiprt6 at acpi0: bus 17 (PCIB)
acpicpu0 at acpi0: C3, PSS
acpicpu1 at acpi0: C3, PSS
acpibtn0 at acpi0: PWRB
acpivideo0 at acpi0: IGD0
ipmi at mainbus0 not configured
cpu0: Enhanced SpeedStep 2992 MHz: speeds: 3000, 2667, 2333, 2000 MHz
pci0 at mainbus0 bus 0
pchb0 at pci0 dev 0 function 0 "Intel 3200/3210 Host" rev 0x01
ppb0 at pci0 dev 1 function 0 "Intel 3200/3210 PCIE" rev 0x01: apic 2 int 16 
(irq 5)
pci1 at ppb0 bus 1
ppb1 at pci1 dev 0 function 0 "Intel IOP333 PCIE-PCIX" rev 0x00
pci2 at ppb1 bus 2
arc0 at pci2 dev 14 function 0 "Areca ARC-1220" rev 0x00: apic 2 int 18 (irq 11)
arc0: 8 ports, 256MB SDRAM, firmware V1.49 2010-12-02
scsibus0 at arc0: 16 targets
sd0 at scsibus0 targ 0 lun 0: <Areca, ARC-1220-VOL#00, R001> SCSI3 0/direct 
fixed
sd0: 953674MB, 512 bytes/sec, 1953124352 sec total
ppb2 at pci1 dev 0 function 2 "Intel IOP333 PCIE-PCIX" rev 0x00
pci3 at ppb2 bus 3
uhci0 at pci0 dev 26 function 0 "Intel 82801I USB" rev 0x02: apic 2 int 16 (irq 
5)
uhci1 at pci0 dev 26 function 1 "Intel 82801I USB" rev 0x02: apic 2 int 17 (irq 
10)
uhci2 at pci0 dev 26 function 2 "Intel 82801I USB" rev 0x02: apic 2 int 18 (irq 
11)
ehci0 at pci0 dev 26 function 7 "Intel 82801I USB" rev 0x02: apic 2 int 18 (irq 
11)
usb0 at ehci0: USB revision 2.0
uhub0 at usb0 "Intel EHCI root hub" rev 2.00/1.00 addr 1
ppb3 at pci0 dev 28 function 0 "Intel 82801I PCIE" rev 0x02: apic 2 int 16 (irq 
5)
pci4 at ppb3 bus 5
ppb4 at pci0 dev 28 function 4 "Intel 82801I PCIE" rev 0x02: apic 2 int 16 (irq 
5)
pci5 at ppb4 bus 13
em0 at pci5 dev 0 function 0 "Intel PRO/1000MT (82573E)" rev 0x03: apic 2 int 
16 (irq 5), address 00:30:48:f9:71:3e
ppb5 at pci0 dev 28 function 5 "Intel 82801I PCIE" rev 0x02: apic 2 int 17 (irq 
10)
pci6 at ppb5 bus 15
em1 at pci6 dev 0 function 0 "Intel PRO/1000MT (82573L)" rev 0x00: apic 2 int 
17 (irq 10), address 00:30:48:f9:71:3f
uhci3 at pci0 dev 29 function 0 "Intel 82801I USB" rev 0x02: apic 2 int 23 (irq 
10)
uhci4 at pci0 dev 29 function 1 "Intel 82801I USB" rev 0x02: apic 2 int 22 (irq 
11)
uhci5 at pci0 dev 29 function 2 "Intel 82801I USB" rev 0x02: apic 2 int 18 (irq 
11)
ehci1 at pci0 dev 29 function 7 "Intel 82801I USB" rev 0x02: apic 2 int 23 (irq 
10)
usb1 at ehci1: USB revision 2.0
uhub1 at usb1 "Intel EHCI root hub" rev 2.00/1.00 addr 1
ppb6 at pci0 dev 30 function 0 "Intel 82801BA Hub-to-PCI" rev 0x92
pci7 at ppb6 bus 17
vga1 at pci7 dev 4 function 0 "XGI Technology Volari Z9s/Z9m" rev 0x00
wsdisplay0 at vga1 mux 1: console (80x25, vt100 emulation)
wsdisplay0: screen 1-5 added (80x25, vt100 emulation)
pcib0 at pci0 dev 31 function 0 "Intel 82801IR LPC" rev 0x02
pciide0 at pci0 dev 31 function 2 "Intel 82801I SATA" rev 0x02: DMA, channel 0 
configured to native-PCI, channel 1 configured to native-PCI
pciide0: using apic 2 int 17 (irq 255) for native-PCI interrupt
ichiic0 at pci0 dev 31 function 3 "Intel 82801I SMBus" rev 0x02: apic 2 int 17 
(irq 10)
iic0 at ichiic0
lm1 at iic0 addr 0x2d: W83627HF
wbng0 at iic0 addr 0x2f: w83793g
spdmem0 at iic0 addr 0x50: 2GB DDR2 SDRAM ECC PC2-6400CL5
spdmem1 at iic0 addr 0x52: 2GB DDR2 SDRAM ECC PC2-6400CL5
pciide1 at pci0 dev 31 function 5 "Intel 82801I SATA" rev 0x02: DMA, channel 0 
wired to native-PCI, channel 1 wired to native-PCI
pciide1: using apic 2 int 18 (irq 11) for native-PCI interrupt
"Intel 82801I Thermal" rev 0x02 at pci0 dev 31 function 6 not configured
usb2 at uhci0: USB revision 1.0
uhub2 at usb2 "Intel UHCI root hub" rev 1.00/1.00 addr 1
usb3 at uhci1: USB revision 1.0
uhub3 at usb3 "Intel UHCI root hub" rev 1.00/1.00 addr 1
usb4 at uhci2: USB revision 1.0
uhub4 at usb4 "Intel UHCI root hub" rev 1.00/1.00 addr 1
usb5 at uhci3: USB revision 1.0
uhub5 at usb5 "Intel UHCI root hub" rev 1.00/1.00 addr 1
usb6 at uhci4: USB revision 1.0
uhub6 at usb6 "Intel UHCI root hub" rev 1.00/1.00 addr 1
usb7 at uhci5: USB revision 1.0
uhub7 at usb7 "Intel UHCI root hub" rev 1.00/1.00 addr 1
isa0 at pcib0
isadma0 at isa0
com0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo
com1 at isa0 port 0x2f8/8 irq 3: ns16550a, 16 byte fifo
pckbc0 at isa0 port 0x60/5
pckbd0 at pckbc0 (kbd slot)
pckbc0: using irq 1 for kbd slot
wskbd0 at pckbd0: console keyboard, using wsdisplay0
pcppi0 at isa0 port 0x61
spkr0 at pcppi0
lpt0 at isa0 port 0x378/4 irq 7
wbsio0 at isa0 port 0x2e/2: W83627HF rev 0x41
lm2 at wbsio0 port 0x290/8: W83627HF
lm1 detached
fdc0 at isa0 port 0x3f0/6 irq 6 drq 2
mtrr: Pentium Pro MTRR support
uhidev0 at uhub5 port 2 configuration 1 interface 0 "Plus More Enterprise LTD. 
USB-compliant keyboard" rev 1.10/1.00 addr 2
uhidev0: iclass 3/1
ukbd0 at uhidev0: 8 modifier keys, 6 key codes
wskbd1 at ukbd0 mux 1
wskbd1: connecting to wsdisplay0
uhidev1 at uhub5 port 2 configuration 1 interface 1 "Plus More Enterprise LTD. 
USB-compliant keyboard" rev 1.10/1.00 addr 2
uhidev1: iclass 3/1, 3 report ids
uhid0 at uhidev1 reportid 1: input=2, output=0, feature=0
uhid1 at uhidev1 reportid 2: input=1, output=0, feature=0
ums0 at uhidev1 reportid 3: 0 button, Z dir
wsmouse0 at ums0 mux 0
vscsi0 at root
scsibus1 at vscsi0: 256 targets
softraid0 at root
root on sd0a swap on sd0b dump on sd0b

dmesg from 5.0 box:

OpenBSD 5.0 (GENERIC.MP) #63: Wed Aug 17 10:14:30 MDT 2011
    dera...@amd64.openbsd.org:/usr/src/sys/arch/amd64/compile/GENERIC.MP
real mem = 4292280320 (4093MB)
avail mem = 4163899392 (3971MB)
mainbus0 at root
bios0 at mainbus0: SMBIOS rev. 2.5 @ 0xcfedf000 (39 entries)
bios0: vendor Phoenix Technologies LTD version "1.2a" date 12/19/2008
bios0: Supermicro X7SBL
acpi0 at bios0: rev 2
acpi0: sleep states S0 S1 S4 S5
acpi0: tables DSDT FACP _MAR TCPA MCFG APIC BOOT SPCR ERST HEST BERT EINJ SLIC 
SSDT SSDT SSDT SSDT SSDT SSDT SSDT SSDT SSDT
acpi0: wakeup devices PEG_(S5) PEX_(S5) LAN_(S5) USB4(S5) USB5(S5) USB7(S5) 
ESB2(S5) EXP1(S5) EXP5(S5) EXP6(S5) USB1(S5) USB2(S5) USB3(S5) USB6(S5) 
ESB1(S5) PCIB(S5) KBC0(S1) MSE0(S1) COM1(S5) COM2(S5) PWRB(S3)
acpitimer0 at acpi0: 3579545 Hz, 24 bits
acpimcfg0 at acpi0 addr 0xe0000000, bus 0-16
acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
cpu0 at mainbus0: apid 0 (boot processor)
cpu0: Intel(R) Core(TM)2 Duo CPU E8400 @ 3.00GHz, 2992.84 MHz
cpu0: 
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,SBF,SSE3,MWAIT,DS-CPL,VMX,SMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,SSE4.1,XSAVE,NXE,LONG
cpu0: 6MB 64b/line 16-way L2 cache
cpu0: apic clock running at 332MHz
cpu1 at mainbus0: apid 1 (application processor)
cpu1: Intel(R) Core(TM)2 Duo CPU E8400 @ 3.00GHz, 2992.50 MHz
cpu1: 
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,SBF,SSE3,MWAIT,DS-CPL,VMX,SMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,SSE4.1,XSAVE,NXE,LONG
cpu1: 6MB 64b/line 16-way L2 cache
ioapic0 at mainbus0: apid 2 pa 0xfec00000, version 20, 24 pins
acpiprt0 at acpi0: bus 0 (PCI0)
acpiprt1 at acpi0: bus 1 (PEG_)
acpiprt2 at acpi0: bus -1 (PEX_)
acpiprt3 at acpi0: bus 5 (EXP1)
acpiprt4 at acpi0: bus 13 (EXP5)
acpiprt5 at acpi0: bus 15 (EXP6)
acpiprt6 at acpi0: bus 17 (PCIB)
acpicpu0 at acpi0: C3, PSS
acpicpu1 at acpi0: C3, PSS
acpibtn0 at acpi0: PWRB
acpivideo0 at acpi0: IGD0
ipmi at mainbus0 not configured
cpu0: Enhanced SpeedStep 2992 MHz: speeds: 3000, 2667, 2333, 2000 MHz
pci0 at mainbus0 bus 0
pchb0 at pci0 dev 0 function 0 "Intel 3200/3210 Host" rev 0x01
ppb0 at pci0 dev 1 function 0 "Intel 3200/3210 PCIE" rev 0x01: msi
pci1 at ppb0 bus 1
ppb1 at pci1 dev 0 function 0 "Intel IOP333 PCIE-PCIX" rev 0x00
pci2 at ppb1 bus 2
arc0 at pci2 dev 14 function 0 "Areca ARC-1210" rev 0x00: apic 2 int 18
arc0: 4 ports, 256MB SDRAM, firmware V1.49 2010-12-02
scsibus0 at arc0: 16 targets
sd0 at scsibus0 targ 0 lun 0: <Areca, ARC-1210-VOL#00, R001> SCSI3 0/direct 
fixed eui.0004d927fffff800
sd0: 476837MB, 512 bytes/sector, 976562176 sectors
ppb2 at pci1 dev 0 function 2 "Intel IOP333 PCIE-PCIX" rev 0x00
pci3 at ppb2 bus 3
uhci0 at pci0 dev 26 function 0 "Intel 82801I USB" rev 0x02: apic 2 int 16
uhci1 at pci0 dev 26 function 1 "Intel 82801I USB" rev 0x02: apic 2 int 17
uhci2 at pci0 dev 26 function 2 "Intel 82801I USB" rev 0x02: apic 2 int 18
ehci0 at pci0 dev 26 function 7 "Intel 82801I USB" rev 0x02: apic 2 int 18
usb0 at ehci0: USB revision 2.0
uhub0 at usb0 "Intel EHCI root hub" rev 2.00/1.00 addr 1
ppb3 at pci0 dev 28 function 0 "Intel 82801I PCIE" rev 0x02: msi
pci4 at ppb3 bus 5
ppb4 at pci0 dev 28 function 4 "Intel 82801I PCIE" rev 0x02: msi
pci5 at ppb4 bus 13
em0 at pci5 dev 0 function 0 "Intel PRO/1000MT (82573E)" rev 0x03: msi, address 
00:25:90:24:60:54
ppb5 at pci0 dev 28 function 5 "Intel 82801I PCIE" rev 0x02: msi
pci6 at ppb5 bus 15
em1 at pci6 dev 0 function 0 "Intel PRO/1000MT (82573L)" rev 0x00: msi, address 
00:25:90:24:60:55
uhci3 at pci0 dev 29 function 0 "Intel 82801I USB" rev 0x02: apic 2 int 23
uhci4 at pci0 dev 29 function 1 "Intel 82801I USB" rev 0x02: apic 2 int 22
uhci5 at pci0 dev 29 function 2 "Intel 82801I USB" rev 0x02: apic 2 int 18
ehci1 at pci0 dev 29 function 7 "Intel 82801I USB" rev 0x02: apic 2 int 23
usb1 at ehci1: USB revision 2.0
uhub1 at usb1 "Intel EHCI root hub" rev 2.00/1.00 addr 1
ppb6 at pci0 dev 30 function 0 "Intel 82801BA Hub-to-PCI" rev 0x92
pci7 at ppb6 bus 17
vga1 at pci7 dev 4 function 0 "XGI Technology Volari Z9s/Z9m" rev 0x00
wsdisplay0 at vga1 mux 1: console (80x25, vt100 emulation)
wsdisplay0: screen 1-5 added (80x25, vt100 emulation)
pcib0 at pci0 dev 31 function 0 "Intel 82801IR LPC" rev 0x02
pciide0 at pci0 dev 31 function 2 "Intel 82801I SATA" rev 0x02: DMA, channel 0 
configured to native-PCI, channel 1 configured to native-PCI
pciide0: using apic 2 int 17 for native-PCI interrupt
ichiic0 at pci0 dev 31 function 3 "Intel 82801I SMBus" rev 0x02: apic 2 int 17
iic0 at ichiic0
lm1 at iic0 addr 0x2d: W83627HF
wbng0 at iic0 addr 0x2f: w83793g
spdmem0 at iic0 addr 0x50: 2GB DDR2 SDRAM ECC PC2-6400CL5
spdmem1 at iic0 addr 0x52: 2GB DDR2 SDRAM ECC PC2-6400CL5
pciide1 at pci0 dev 31 function 5 "Intel 82801I SATA" rev 0x02: DMA, channel 0 
wired to native-PCI, channel 1 wired to native-PCI
pciide1: using apic 2 int 18 for native-PCI interrupt
"Intel 82801I Thermal" rev 0x02 at pci0 dev 31 function 6 not configured
usb2 at uhci0: USB revision 1.0
uhub2 at usb2 "Intel UHCI root hub" rev 1.00/1.00 addr 1
usb3 at uhci1: USB revision 1.0
uhub3 at usb3 "Intel UHCI root hub" rev 1.00/1.00 addr 1
usb4 at uhci2: USB revision 1.0
uhub4 at usb4 "Intel UHCI root hub" rev 1.00/1.00 addr 1
usb5 at uhci3: USB revision 1.0
uhub5 at usb5 "Intel UHCI root hub" rev 1.00/1.00 addr 1
usb6 at uhci4: USB revision 1.0
uhub6 at usb6 "Intel UHCI root hub" rev 1.00/1.00 addr 1
usb7 at uhci5: USB revision 1.0
uhub7 at usb7 "Intel UHCI root hub" rev 1.00/1.00 addr 1
isa0 at pcib0
isadma0 at isa0
com0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo
com1 at isa0 port 0x2f8/8 irq 3: ns16550a, 16 byte fifo
pckbc0 at isa0 port 0x60/5
pckbd0 at pckbc0 (kbd slot)
pckbc0: using irq 1 for kbd slot
wskbd0 at pckbd0: console keyboard, using wsdisplay0
pcppi0 at isa0 port 0x61
spkr0 at pcppi0
lpt0 at isa0 port 0x378/4 irq 7
wbsio0 at isa0 port 0x2e/2: W83627HF rev 0x41
lm2 at wbsio0 port 0x290/8: W83627HF
fdc0 at isa0 port 0x3f0/6 irq 6 drq 2
mtrr: Pentium Pro MTRR support
uhidev0 at uhub5 port 1 configuration 1 interface 0 "Plus More Enterprise LTD. 
USB-compliant keyboard" rev 1.10/1.00 addr 2
uhidev0: iclass 3/1
ukbd0 at uhidev0: 8 modifier keys, 6 key codes
wskbd1 at ukbd0 mux 1
wskbd1: connecting to wsdisplay0
uhidev1 at uhub5 port 1 configuration 1 interface 1 "Plus More Enterprise LTD. 
USB-compliant keyboard" rev 1.10/1.00 addr 2
uhidev1: iclass 3/1, 3 report ids
uhid0 at uhidev1 reportid 1: input=2, output=0, feature=0
uhid1 at uhidev1 reportid 2: input=1, output=0, feature=0
ums0 at uhidev1 reportid 3: 0 button, Z dir
wsmouse0 at ums0 mux 0
vscsi0 at root
scsibus1 at vscsi0: 256 targets
softraid0 at root
scsibus2 at softraid0: 256 targets
root on sd0a (746730e0444f949b.a) swap on sd0b dump on sd0b
lm1: disabling sensors

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