I may be wrong here, more reading than experience in this particular
area, but my understanding is that it would still recommend making
sure nothing's writing to the database while the dump is taken.

For a heavily used transactional systems with complex relational
structures, IMO it's possible that otherwise there would be data
inconsistencies - e.g. this table's been updated but that one hasn't
yet completed.

Probably less important for mailstores.

On Sat, Mar 26, 2011 at 6:57 PM, Doug Lytle <support AT drdos DOT info> wrote:
> hansbkk AT gmail DOT com wrote:
>> If you want
>> to really minimize the downtime, then using LVM snapshotting is a good
>> option.
>>
>> 1. shut down the service
>> 2 take the snapshot
>>
>
> Just an addition to this,
>
> If using the XFS file system, snapshotting will cause LVM to preform an
> file system freeze, just before the snapshot.  No shutting down the
> service is needed.
>
> Doug

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