Compaq RA4x00 logical volumes not detected in kernel 2.6

Compaq RA4x00 logical volumes not detected in kernel 2.6

[Horák Daniel]

Hello,

I have a problem with detecting logical volumes on Compaq Raid Array
4x00 which is connected to my server via Emulex LP8000 Fibre Channel
card and FC hub. System is CentOS 4 with kernel 2.6.9 (=RHEL4 clone)

I get the following messagen in syslog

scsi8 : Emulex LightPulse LP8000 1 Gigabit PCI Fibre Channel Adapter on
PCI bus 04 device 20 irq 5 
scsi: unknown device type 12 
Vendor: COMPAQ Model: ARRAY CONTROLLER Rev: 2.54 
Type: RAID ANSI SCSI revision: 00 
scsi: unknown device type 12 
Vendor: COMPAQ Model: ARRAY CONTROLLER Rev: 2.60 
Type: RAID ANSI SCSI revision: 00 

The result of discussion in lpfc forum is that there should be a problem
the scanning part of SCSI layer.

The detected devices should look like the folling output (these messages
are from the same system booted into RHEL3 clone (Whitebox, kernel 2.4)
with the arrays attached via Compaq FC card).

 kernel: Starting timer : 0 0
 kernel:   Vendor: COMPAQ    Model: LOGICAL VOLUME    Rev: 2.60
 kernel:   Type:   Direct-Access                      ANSI SCSI
revision: 02
 kernel: Starting timer : 0 0
 kernel:   Vendor: COMPAQ    Model: LOGICAL VOLUME    Rev: 2.60
 kernel:   Type:   Direct-Access                      ANSI SCSI
revision: 02
 kernel: Starting timer : 0 0
 kernel:   Vendor: COMPAQ    Model: LOGICAL VOLUME    Rev: 2.54
 kernel:   Type:   Direct-Access                      ANSI SCSI
revision: 02
 kernel: Starting timer : 0 0
 kernel: Attached scsi disk sda at scsi2, channel 0, id 0, lun 0
 kernel: Attached scsi disk sdb at scsi2, channel 0, id 0, lun 1
 kernel: Attached scsi disk sdc at scsi2, channel 0, id 1, lun 0


		Thank you
			Dan Horak

Re: Compaq RA4x00 logical volumes not detected in kernel 2.6

[James Bottomley]

On Wed, 2005-06-15 at 14:10 +0200, Horák Daniel wrote:
> I have a problem with detecting logical volumes on Compaq Raid Array
> 4x00 which is connected to my server via Emulex LP8000 Fibre Channel
> card and FC hub. System is CentOS 4 with kernel 2.6.9 (=RHEL4 clone)
> 
> I get the following messagen in syslog
> 
> scsi8 : Emulex LightPulse LP8000 1 Gigabit PCI Fibre Channel Adapter on
> PCI bus 04 device 20 irq 5 
> scsi: unknown device type 12 
> Vendor: COMPAQ Model: ARRAY CONTROLLER Rev: 2.54 
> Type: RAID ANSI SCSI revision: 00 

This is because the RA4100 shows it's volumes as the array controller
type.  You actually have to use array controller commands to access
them.  The cpqfc driver quietly translated these internally, so it's the
only driver that will work with the RA4100 array (unless someone writes
an ULD for type array controller).  Unfortunately, compaq discontinued
support for cpqfc a while ago and the driver has been decaying in the
tree (to the point where it won't really build now).

James


> scsi: unknown device type 12 
> Vendor: COMPAQ Model: ARRAY CONTROLLER Rev: 2.60 
> Type: RAID ANSI SCSI revision: 00 
> 
> The result of discussion in lpfc forum is that there should be a problem
> the scanning part of SCSI layer.
> 
> The detected devices should look like the folling output (these messages
> are from the same system booted into RHEL3 clone (Whitebox, kernel 2.4)
> with the arrays attached via Compaq FC card).
> 
>  kernel: Starting timer : 0 0
>  kernel:   Vendor: COMPAQ    Model: LOGICAL VOLUME    Rev: 2.60
>  kernel:   Type:   Direct-Access                      ANSI SCSI
> revision: 02
>  kernel: Starting timer : 0 0
>  kernel:   Vendor: COMPAQ    Model: LOGICAL VOLUME    Rev: 2.60
>  kernel:   Type:   Direct-Access                      ANSI SCSI
> revision: 02
>  kernel: Starting timer : 0 0
>  kernel:   Vendor: COMPAQ    Model: LOGICAL VOLUME    Rev: 2.54
>  kernel:   Type:   Direct-Access                      ANSI SCSI
> revision: 02
>  kernel: Starting timer : 0 0
>  kernel: Attached scsi disk sda at scsi2, channel 0, id 0, lun 0
>  kernel: Attached scsi disk sdb at scsi2, channel 0, id 0, lun 1
>  kernel: Attached scsi disk sdc at scsi2, channel 0, id 1, lun 0
> 
> 
> 		Thank you
> 			Dan Horak
> -
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Re: Compaq RA4x00 logical volumes not detected in kernel 2.6

[Eddie Williams]

The problem is not with how the driver scans but with the device type
the array returns for each LUN.  The device type being returned by this
array, aka "scsi: unknown device type 12" is defined as "Storage array
controller device (e.g., RAID)".  This array does not return as a
"direct access device", aka device type 0.  

As you have seen there is no mid-layer driver that knows how to handle
this type.

If you look at the cpqfc driver used with the Compaq FC controller it
converts the device type to 0.  I am not sure if the cpqfc driver is
doing more than just munging the device type from 12 to 0.  It has been
4 or so years since I worked with a 4x00 array and found the same thing
you did.  I was not very disappointed when Compaq discontinued the
4x00!  I had problems with the cpqfc driver and moved the array to a
Qlogic SAN.  When I ran into the issue with the device type as you found
I chose to go back to the cpqfc driver and work with Compaq to fix the
cpqfc driver rather than trying to fix the device type.

I think the short answer is to use the 4x00 arrays you have to use a
driver that knows how to map the array from a "RAID" device type to a
direct access device type.  That, I think, restricts you to use the
cpqfc driver.  I believe the 4x00 array is broken when it returns the
device type 12 for each LUN and rather than fix the firmware Compaq
chose to have the driver handle it.  

Your other option is to create a module that will handle the device type
12 correctly.  I am not familiar with any other arrays that return a
type of 12 so I am not sure the effort is worth it.

Eddie

On Wed, 2005-06-15 at 08:10, Horák Daniel wrote:
> Hello,
> 
> I have a problem with detecting logical volumes on Compaq Raid Array
> 4x00 which is connected to my server via Emulex LP8000 Fibre Channel
> card and FC hub. System is CentOS 4 with kernel 2.6.9 (=RHEL4 clone)
> 
> I get the following messagen in syslog
> 
> scsi8 : Emulex LightPulse LP8000 1 Gigabit PCI Fibre Channel Adapter on
> PCI bus 04 device 20 irq 5 
> scsi: unknown device type 12 
> Vendor: COMPAQ Model: ARRAY CONTROLLER Rev: 2.54 
> Type: RAID ANSI SCSI revision: 00 
> scsi: unknown device type 12 
> Vendor: COMPAQ Model: ARRAY CONTROLLER Rev: 2.60 
> Type: RAID ANSI SCSI revision: 00 
> 
> The result of discussion in lpfc forum is that there should be a problem
> the scanning part of SCSI layer.
> 
> The detected devices should look like the folling output (these messages
> are from the same system booted into RHEL3 clone (Whitebox, kernel 2.4)
> with the arrays attached via Compaq FC card).
> 
>  kernel: Starting timer : 0 0
>  kernel:   Vendor: COMPAQ    Model: LOGICAL VOLUME    Rev: 2.60
>  kernel:   Type:   Direct-Access                      ANSI SCSI
> revision: 02
>  kernel: Starting timer : 0 0
>  kernel:   Vendor: COMPAQ    Model: LOGICAL VOLUME    Rev: 2.60
>  kernel:   Type:   Direct-Access                      ANSI SCSI
> revision: 02
>  kernel: Starting timer : 0 0
>  kernel:   Vendor: COMPAQ    Model: LOGICAL VOLUME    Rev: 2.54
>  kernel:   Type:   Direct-Access                      ANSI SCSI
> revision: 02
>  kernel: Starting timer : 0 0
>  kernel: Attached scsi disk sda at scsi2, channel 0, id 0, lun 0
>  kernel: Attached scsi disk sdb at scsi2, channel 0, id 0, lun 1
>  kernel: Attached scsi disk sdc at scsi2, channel 0, id 1, lun 0
> 
> 
> 		Thank you
> 			Dan Horak
> -
> To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

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