[linux-lvm] LVM mirror questions

[Ray Morris]

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Ray Morris
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On 10/06/2010 10:50:41 AM, Jay wrote:
> Hi Petr,
> 
> Thanks for the reply.  "Should continue to work.." leaves me with  
> some doubt.
>  My intent for a mirror is for a datastore that has reliability at  
> the expense
> of space.   In addition, when a large datastore is rebooted, there  
> would be a
> period of time when the data is being mirrored, which leaves a window  
> of
> peril. After I migrate my data off of lvm and onto an md device, I  
> will test
> lvm.
> 
> Test #1 will be start a huge write operation on a mirror that  
> consists of 2
> mirrors and 1 log, all on seperate pvs.   While the write operation is
> happening, I will unplug the log drive and see if lvm switches in  
> midstream to a
> memory log without loss.
> 
> Test #2 will be to see if I can make lvm activate lvs or vgs in a  
> certain order.
>   That way I could make the first 20 extents of every physical device  
> part of a
> vg/lv that houses mirror logs.   These log lvs would be mirrored  
> across all
> physical devices.   The log lvs would have memory logs, which would  
> be ok since
> they will be so small.     The window of peril is reduced from hours  
> to a few
> seconds.
> 
> Anyways, thanks again for the answer!
> 
> Jason Harris
> 
> 
> 
> ________________________________
> From: Petr Rockai <prockai at redhat.com>
> To: LVM general discussion and development <linux-lvm at redhat.com>
> Sent: Tue, October 5, 2010 1:02:55 AM
> Subject: Re: [linux-lvm] LVM mirror questions
> 
> Jay <jrharris19 at yahoo.com> writes:
> > What happens to an lvm mirror if the disk log is lost?
> 
> The mirror should continue to work with a core (memory) log.
> 
> Yours,
>    Petr.
> 
> _______________________________________________
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> linux-lvm at redhat.com
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> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
> 
> 
> 
> 

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