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<div class="moz-cite-prefix">On 12/5/14, 12:36 PM, Ryan Dunlop
wrote:<br>
<br>
Yea I read this and was hoping they would import as ata devices..
but i can't see them atacontrol either.<br>
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<blockquote
cite="mid:CAKOK-RwWOizjkUWtPqHZ_s-P7LYLQDm9TePG+aL64c5gJqXjGA@mail.gmail.com"
type="cite">
<div dir="ltr">aren't they xen block device naming? <br>
<br>
<h2 id="Block_Device_Naming">Block Device Naming</h2>
<span class="" id="line-24"></span><span class="" id="line-25"></span>
<p class="">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. <span
class="" id="line-26"></span><span class="" id="line-27"></span></p>
<p class="">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. <span class="" id="line-28"></span><span
class="" id="line-29"></span></p>
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.) <br>
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<div class="gmail_extra"><br>
<div class="gmail_quote">On Fri, Dec 5, 2014 at 12:24 PM, Linda
Kateley <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:lkateley@kateley.com" target="_blank">lkateley@kateley.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">Hey,<br>
<br>
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.<br>
<br>
linda<br>
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