Re: sd devices on FC14 AMI not valid?

[Brian LaMere <brian@xxxxxxxxxxxxxxxxxxxx>]

replace "sd" with "xvd" and you'll be set.  It's not a "scsi disk" but instead a "xen virtual (block) device"

On older AKIs, sometimes one would see drives presented to the OS as /dev/sd* still, but it seems like since pvgrub this is no longer the case.  It's more "honest" this way regardless; the kernel is seeing it (or at least, presenting it) more accurately for what it is.  It never should have listed those drives as /dev/sd*

So...point is...it's not supposed to be /dev/sd* - just like it wasn't /dev/sd* when you used old IDE drives (those were /dev/hd*).  Almost all kernels have built-in support for IDE and SCSI, but not for Xen; that's loaded as a module, instead.  If you do an "lsmod" you should see a loaded module named xen_blkfront - note also that it has a "used by" value that is the same as the number of (valid...) /dev/xvd* block devices.

See http://lxr.free-electrons.com/source/drivers/block/xen-blkfront.c for info about that module...

Does that answer the question?  Disregard what Amazon says you should see the device reporting as - it should be xvd*, not sd*.  It's not using the scsi driver.

Brian

On Wed, Feb 9, 2011 at 5:49 PM, David HM Spector <spector@xxxxxxxxxxxxx> wrote:

I am trying to get an attached EBS volume to mount on a customized (ots of php and rails packages) version of the FC14 AMI.

It seems the sd devices aren't made by default; but even once they're made, mount refuses to mount the volume

saying " /dev/sdf is not a valid block device"   Its a an ext3 filesystem so nothing novel there.  

Everything works fine on my older instances with the same scripts; I can get he EBS volume to attach to the instance (I have 

some custom ruby scripts that work at startup to attach vol ids passed as user data) and the perms/maj/min device numbers

look OK too (as one would expect from MAKEDEV). 

 Anything obvious I am missing?  

tnx,

  David

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                                          David HM Spector

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