Re: [Moosefs-users] Moosefs automated failover with ucarp

[Thomas S H. <tha...@gm...>]

As for your first question, when the failover occurs we want it to use the
metalogger data. There is a chance that the machine which is the failover
used to be a master, and that it has old metadata. The mv command is to
ensure that only metalogs are being used by mfsmetarestore and not metadata
that would be old and from a a previous run as the mfsmaster.

As for your second question, you are correct in that the contents of the
setup.sh could be executed inline in the vip-up script, so long as they are
executed in the background, but you do need everything in the setup.sh to be
executed, otherwise many conflicts can arise!

And finally, yes, in the vip-down could probably use a few lines to shutdown
the mfsmaster.

-Tom Hatch

On Mon, Dec 27, 2010 at 8:44 AM, Leonid Satanovsky <leo...@ar...>wrote:

> Greetings!
> Have reviewed the HOWTO, and there are two questions:
> 1)
>  You do the following:
>
>   <...>
>   mv $MFS/changelog.* $MFS/metadata.* $MFS/tmp/
>
>   service mfsmetalogger stop
>   mfsmetarestore -a   #!# BUT, On what files will it work if all the
> metadata and changelog files are "gone" to the "${MFS}/tmp" folder?
>
>   if [ -e $MFS/metadata.mfs ]    #!# The file will not be there, I think,
> cos' you have moved it to "${MFS}/tmp" folder
>
>   <...>
> _______________________________________________________________________
> 2) The second on is for all the audience:
> Isn't it just enough (or is it correct?...) to do the following:
>
> ------/ucarp-down-----
> #!/bin/sh
>
> <....>
>
> (
>       mfsmaster stop
>       mfsmetarestore -a   # DO WE NEED THIS?
>       mfsmetalogger start
> ) &
>
> ______________________________________________________________
>
> ------/ucarp-up-----
>
>
> #!/bin/sh
>
> <....>
>
> (
>       mfsmetalogger stop
>       killall -9 mfsmetalogger
>       mfsmetarestore -a          # DO WE NEED THIS?
>       mfsmaster start
> ) &
>
>
>
>
>
> ----- Original Message ----- From: "Thomas S Hatch" <tha...@gm...>
> To: "moosefs-users" <moo...@li...>
> Sent: Friday, December 24, 2010 8:11 AM
>
> Subject: [Moosefs-users] Moosefs automated failover with ucarp
>
>
>  Sorry, this has taken me a while, my present service deployment has been
>> very demanding, and heck, it needs 1.6.19 anyway!
>>
>> I wrote it in asciidoc, enjoy!
>>
>> (Consider this file to be Copyright Thomas S Hatch under the FDL licence,
>> or
>> whatever the MooseFS developers prefer blah blah blah...)
>>
>> -Thomas S Hatch
>>
>>
>
>
> --------------------------------------------------------------------------------
>
>
> ------------------------------------------------------------------------------
>> Learn how Oracle Real Application Clusters (RAC) One Node allows customers
>> to consolidate database storage, standardize their database environment,
>> and,
>> should the need arise, upgrade to a full multi-node Oracle RAC database
>> without downtime or disruption
>> http://p.sf.net/sfu/oracle-sfdevnl
>>
>
>
>
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>
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