Re: kern/53616: dom0 crashes when dumping domU images with vnd+fss

[mlelstv%serpens.de@localhost (Michael van Elst)]

The following reply was made to PR kern/53616; it has been noted by GNATS.

From: mlelstv%serpens.de@localhost (Michael van Elst)
To: gnats-bugs%netbsd.org@localhost
Cc: 
Subject: Re: kern/53616: dom0 crashes when dumping domU images with vnd+fss
Date: Wed, 19 Sep 2018 07:09:00 -0000 (UTC)

 kre%munnari.OZ.AU@localhost (Robert Elz) writes:
 
 > It is possible that snapshotting an LVM might work, though I have no idea=
 > 
 > if we support that  - thyat would basically modify the block map undernea=
 > th
 > the filesystem, and should be possible (if implemented...)   Bit not the
 > filesystem itself.
 
 Snapshotting LVM is not yet supported.
 
 I also doubt that we support mounting a filesystem or a filesystem+snapshot
 by two different kernels at the same time unless it's all read-only.
 
 There is also the caveat that DomU currently always uses a 512byte/sector
 geometry but Dom0 uses the real one. For vnd devices that isn't a problem
 (modulo performance), but for real disks, LVM or not, it is.
 
 
 -- 
 -- 
                                 Michael van Elst
 Internet: mlelstv%serpens.de@localhost
                                 "A potential Snark may lurk in every tree."