[Linux-cluster] Ext3/ext4 in a clustered environement

[Kaloyan Kovachev]

On Mon, 7 Nov 2011 16:21:59 -0500, "Nicolas Ross"
<rossnick-lists at cybercat.ca> wrote:
>> | Is it possible to make snapshots in a *cluster* LVM environment ?
>> | Last time I
>> | read the manual it was not possible.
>>
>> I highly suspect Nick was talking about _hardware_ snapshotting that is
>> supported by some SANs, _not_ our clustered snapshot software.
> 
> You are right, I don't beleive our enclosure support hw snapshot. It's
not 
> that smart...
> 
> But in our case, I don't see what good a snapshot would do.
> 
> A little bit more on our client's process. They work on documenting and 
> publishing documents and images to a so-called "work version" named 
> doctravail/ (in french ;-). Once they decides a document, image,
whatever
> is 
> good for production it is copied into the so-called "curent version" 
> directory named doccourant/.
> 
> On theire web sites, there is 3 databases used in rotation, doca, b and
c.
> 
> At night, data is fetch from their intranet database and pumped into the

> next to be used database, and then the data from the doccourant/ is
> rsync-ed 
> into the corresponding document directory of the web server.
> 
> So I during the night, data from the doctravail/ directory doesn't move.
> It 
> won't help if I use a snapshot of that volume to rsync to the
destination.
> I 
> think...
> 

It will help to avoid expensive DLM locking if yoo mount the snapshot with
local locking.

> Regards, 
> 
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