sd devices on FC14 AMI not valid?
Brian LaMere
brian at cukerinteractive.com
Thu Feb 10 02:28:37 UTC 2011
replace "sd" with "xvd" and you'll be set. It's not a "*s*csi *d*isk" but
instead a "*x*en *v*irtual (block) *d*evice"
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 at zeitgeist.com>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
>
>
> ----------------------------------------------------------------------------------------------
>
> David HM Spector
>
> spector at zeitgeist dot com
> http://www.zeitgeist.com
>
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>
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