Re: [Evms-devel] newbie question - cannot mount snapshot volume

[Kevin C. <kev...@us...>]

Hi Chia,

On Monday 22 September 2003 19:44, Chia Chao wrote:
> Hi
>
> I created a snapshot volume but attempts to mount this volume resulted in
> error:
>
> Engine: mount: mount: block device /dev/evms/sv is write-protected,
> mounting red-only

This just means you created the snapshot as read-only instead of writeable.

> mount: wrong fs type, bad option, bad superblock on /dev/evms/sv, or too
> many mounted file systems

Generally you'll see this error when you're taking a snapshot of a journaled 
filesystem and you haven't applied the VFS-lock patch to the kernel. Did you 
read through the INSTALL file in the 2.1.1 package when installing EVMS? Did 
you follow section 2.B.5?

Also, is this an ext2 or an ext3 filesystem? It will make a difference in this 
case.

> EXT2-fs: device-mapper(254,16)couldn't mount because of unsupported
> optional features (4).

I don't think I've ever seen this error before. I'll have to search through 
the kernel source to see what triggers it.

> This is a 2.4.21 kernel with device-mapper-1.00.05 and evms-2.1.1. The
> original volume is an evms volume (EXT2/3), and the snapshot volume is also
> an evms volume created from a snapshot object (no FS).
>
> Thanks
>
> Chia

-- 
Kevin Corry
kev...@us...
http://evms.sourceforge.net/