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Re: [linux-lvm] Cannot get rid of root filesystem LVM snapshot



Thanks for info. I suggest to stress the fact that snapshotting of
root filesystem is not yet supported somewhere in documentation,
HOWTOs etc. Many people might not be as lucky as me and find it out
only after they are left with frozen or even corrupted system.

Martin

2006/9/10, Alasdair G Kergon <agk redhat com>:
The tools do not support root snapshots properly yet - whether or not they
work is down to chance.  To remove one reliably you need lvremove from a
rescue environment - you're lucky lvremove is refusing to proceed - if it
got further it could hang your machine.  In principle you can recover
without rebooting but you'll need to write a custom script to run various
dmsetup commands from a ramdisk, for example, and then fix up the lvm2
metadata with activation disabled.  [If you learn how snapshots are
created/destroyed you can work out what to do: sorry, it's too much for me
to explain here.  This is what the tools will want enhancing to do to
provide proper support.]

Older kernels like yours however can get into a state where recovery is only
possible by writing directly to kernel memory, if you already ran certain
commands in the wrong sequence.

Alasdair
--
agk redhat com

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