On 12/5/14, 12:36 PM, Ryan Dunlop wrote:

Yea I read this and was hoping they would import as ata devices.. but i 
can't see them atacontrol either.
> aren't they xen block device naming?
>
>
>     Block Device Naming
>
> Xen hijacks the Linux block device major/minor numbering scheme and 
> stuffs it into the block devices available for the DomU's. So if you 
> use "sda1" for your Xen jail, The Linux Xen DomU block device driver 
> would hijack the major number from the scsi device driver and use it.
>
> FreeBSD/Xen used to simply create an "xbd" device with the raw device 
> number after it. This changed recently (thanks to dfr?) to somewhat 
> emulate what Linux was doing. From what I can tell, using hdX and 
> partitions (hdXa, hdXb, etc) will result in the relevant ATA devices 
> being created in the kernel (ad0s1, ad1s1, etc.) Simiarly for SCSI - 
> sdX became daX in FreeBSD.
>
> To get "xbd" (which I was using to make sure I had separately named 
> devices that absolutely didn't look like they should deserve a normal 
> DOS label) I need to use the major "202" (0xCA) with unit numbers 
> being minor >> 4. So 0xCA00 is xbd0, 0xCA10 is xbd1, 0xCA20 is xbd2, 
> etc. This gives me xbd0 -> xbd15 before I run out of "xbd" slices. 
> (Actually that isn't true but I won't assume I'll get any more. Those 
> who are interested should read 
> sys/dev/xen/blkfront/blkfront.c:blkfront_vdevice_to_unit() to see.)
>
> On Fri, Dec 5, 2014 at 12:24 PM, Linda Kateley <lkateley at kateley.com 
> <mailto:lkateley at kateley.com>> wrote:
>
>     Hey,
>
>     Does anyone happen to run freebsd on xen or use ec2? I just ran
>     into this weird thing that the disks come up as xbd, but not sure
>     what kind of disks they are? can't see them with camcontrol.
>
>     linda
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