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[dm-devel] Re: [RFC] [PATCH] lvm2: mirroredlog support

Be careful not to waste your time on some thing that will not be included....

I see the order of events like this:
1) Generic layering of LVs
2) Improved mirror DSO
3) Mirrored log implementation

Note that once you get #1 done you /should/ be able to get a mirrored log by:
prompt> lvcreate -m1 --mirrorlog core -l 1 -n mirrored_log vg
prompt> lvcreate -m1 -L 5G -n mirror vg /dev/sdb /dev/sdc /dev/vg/mirrored_log

Leapfrogging #2 /might/ be acceptable, but leapfrogging #1 is not.  This is because you are creating a one-off solution rather than creating something more general that would benefit LVM as a whole.

Feel free to disagree, but I really see the above as the way forward.


On Dec 29, 2008, at 6:10 PM, malahal us ibm com wrote:

This patch adds '--mirroredlog' option to LVM commands to create a
mirror with mirrored log device. Rebased to the latest LVM code
(LVM2.2.02.43). Appreciate any comments.

Signed-off-by: Stefan Raspl <raspl de ibm com>

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