[ale] DRBD - anyone using this?

[Jim Kinney]

On Fri, 2015-02-20 at 10:56 -0500, Chuck Payne wrote:
> We are using where I work for 4 clusters each made of two nodes.  As
> Jim stated it not a back up, it so that your data is synced at the
> same time. We have the systems flip and are very happy because the
> data was in sync.  We are working with Linbit the people that wrote
> drbd because unless you know someone that a master a pacemaker,
> corosync, and ipmi. Then you will have issues. Our issues the size of
> DB, we are work with them to get STONITH setup.  
> 
> 
> DRBD great for DB and Website. I don't recommend NFS. I did testing
> and there are issues. 

I've used DRBD with NFS and some custom stonith scripts to make a
redundant fileserver pair. I did not set it up. It did work rather well
as long as when the dead box was brought up it was done so by someone
who knew how to do it.Basically, if box A was master and B was backup,
if A went down, B took over just fine. But when A came back up it did so
thinking it was still master. That meant new file changes were not going
to get synched over from B. So we had to bring it up with network
disconnected, change a config file to make it a backup box then restart
it. Once synched, A & B were both reset to be as original master and
backup. It worked but was rather cludgy.
> 
> 
> On Fri, Feb 20, 2015 at 10:37 AM, Robert L. Harris
> <robert.l.harris at gmail.com> wrote:
>         I've used it.  When it runs, it works great.  I had it on a
>         pair of machines for about 4 years and saved me a lot of pain.
>         But twice in that time when there was a crash it came up
>         inconsistent and I spent a few long stretches getting it
>         re-sorted.  Never lost any data but it was hairy...
>         
>         
>         
>         On Fri Feb 20 2015 at 8:30:22 AM leam hall
>         <leamhall at gmail.com> wrote:
>                 I have worked with it a little and have had a few
>                 conversations with
>                 LINBIT, the company behind it. If I had a need for
>                 solid replication
>                 that would be the first product I'd look at.
>                 
>                 On Fri, Feb 20, 2015 at 10:17 AM, Preston
>                 <preston.lists at gmail.com> wrote:
>                 > Hey folks,
>                 >
>                 > I'm curious if anyone here is using DRBD. If so,
>                 what are your experiences?
>                 >
>                 > I'm looking at it to back up various SQL databases.
>                 >
>                 > Preston
>                 >
>                 > --
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> 
> 
> -- 
> Terror PUP a.k.a
> Chuck "PUP" Payne
>  
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-- 
James P. Kinney III

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gain at one end you lose at the other. It's like feeding a dog on his
own tail. It won't fatten the dog.
- Speech 11/23/1900 Mark Twain

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