7.2-RELEASE-p4, IO errors & RAID1 failure

[Miroslav Lachman]

Jeremy Chadwick wrote:
> On Fri, Jun 18, 2010 at 08:08:24AM +0100, Matthew Lear wrote:

[...]

>> The drives in the RAID exist on two seperate ATA channels:
>> [root at meshuga /home/matt]# atacontrol list
>> ATA channel 0:
>>      Master:  ad0<WDC WD3200AAKS-00VYA0/12.01B02>  SATA revision 2.x
>>      Slave:   ad1<FB160C4081/HPF0>  SATA revision 1.x
>> ATA channel 1:
>>      Master:  ad2<WDC WD3200AAKS-00VYA0/12.01B02>  SATA revision 2.x
>>      Slave:       no device present
>> ATA channel 2:
>>      Master: acd0<HL-DT-ST DVDRAM GH22NS40/NL01>  SATA revision 1.x
>>      Slave:       no device present
>> ATA channel 3:
>>      Master:      no device present
>>      Slave:       no device present
>>
>> ad1 is a third 160G drive that I periodically back up to using cron.
>
> So your RAID-1 array consists of ad0 and ad2?  You didn't provide
> "atacontrol status" output so I'm going to assume that's the case.
>
> What's odd to me is that you somehow have two disks on a single ATA
> channel -- look closely at channel 0.  SATA has a 1:1 device-to-channel
> mapping, so I'm a little surprised to see there's two devices on channel
> 0.  To me, this indicates your system BIOS is configured to run in
> "Emulation" mode -- where the ATA controller pretends to be a PATA/IDE
> controller, thus SATA-0 and SATA-1 devices appear as primary master and
> primary slave, respectively.
>
> What motherboard is this?  Can you change the setting to either
> "Native", "Enhanced", or (even better) "AHCI"?  I've seen some systems
> where the Serial ATA option in the BIOS has an "Auto" option, which does
> totally bizarre things at times.
>
> But before changing the setting, I would recommend dealing with the disk
> problem first.  Changing the SATA controller operation mode will almost
> certainly change all of your device names (you'll have to go into
> single-user mode, mount filesystems by hand, fix /etc/fstab, etc.).

[...]

It is "normal" on HP G5 series. I have ProLiant ML 110 G5. I tried all 
type of settings in BIOS, but all of them shows two disks on one ATA 
channel:

HP ProLiant ML 110 G5

FreeBSD 7.2-RELEASE-p4 amd64 GENERIC

root at kiwi ~/# atacontrol list
ATA channel 0:
     Master:  ad0 <SAMSUNG HD103UJ/1AA01113> SATA revision 2.x
     Slave:   ad1 <SAMSUNG HD103UJ/1AA01113> SATA revision 2.x
ATA channel 1:
     Master:  ad2 <SAMSUNG HD103UJ/1AA01113> SATA revision 2.x
     Slave:   ad3 <SAMSUNG HD103UJ/1AA01113> SATA revision 2.x
ATA channel 2:
     Master: acd0 <HL-DT-ST DVD-RAM GH15L/FA01> SATA revision 1.x
     Slave:       no device present
ATA channel 3:
     Master:      no device present
     Slave:       no device present



atapci0: <Intel ICH9 SATA300 controller> port 
0x1f0-0x1f7,0x3f6,0x170-0x177,0x376,0x1c10-0x1c1f,0x1c00-0x1c0f at 
device 31.2 on pci0
ata0: <ATA channel 0> on atapci0
ata0: [ITHREAD]
ata1: <ATA channel 1> on atapci0
ata1: [ITHREAD]
pci0: <serial bus, SMBus> at device 31.3 (no driver attached)
atapci1: <Intel ICH9 SATA300 controller> port 
0x1c68-0x1c6f,0x1c5c-0x1c5f,0x1c60-0x1c67,0x1c58-0x1c5b,0x1c30-0x1c3f,0x1c20-0x1c2f 
irq 18 at device 31.5 on pci0
atapci1: [ITHREAD]
ata2: <ATA channel 0> on atapci1
ata2: [ITHREAD]
ata3: <ATA channel 1> on atapci1
ata3: [ITHREAD]


pciconf -lv
atapci0 at pci0:0:31:2:    class=0x01018a card=0x31f4103c chip=0x29208086 
rev=0x02 hdr=0x00
     vendor     = 'Intel Corporation'
     device     = '82801IB/IR/IH (ICH9 Family) 4 port Serial ATA Storage 
Controller 1'
     class      = mass storage
     subclass   = ATA

atapci1 at pci0:0:31:5:    class=0x010185 card=0x31f4103c chip=0x29268086 
rev=0x02 hdr=0x00
     vendor     = 'Intel Corporation'
     device     = '82801IB/IR/IH (ICH9 Family) 2 port Serial ATA Storage 
Controller 2'
     class      = mass storage
     subclass   = ATA



ad0: 953869MB <SAMSUNG HD103UJ 1AA01113> at ata0-master SATA300
ad1: 953869MB <SAMSUNG HD103UJ 1AA01113> at ata0-slave SATA300
ad2: 953869MB <SAMSUNG HD103UJ 1AA01113> at ata1-master SATA300
ad3: 953869MB <SAMSUNG HD103UJ 1AA01113> at ata1-slave SATA300
da0 at umass-sim0 bus 0 target 0 lun 0
da0: <USB 2.0 USB Flash Drive 0.00> Removable Direct Access SCSI-2 device
da0: 40.000MB/s transfers
da0: 1928MB (3948544 512 byte sectors: 255H 63S/T 245C)
acd0: DVDR <HL-DT-ST DVD-RAM GH15L/FA01> at ata2-master SATA150


I am using this machine as storage for backups with ZFS RAIDZ without 
any timeouts so I think that two disks on one channel is not causing the 
timeouts (only little slowdown)

Miroslav Lachman