[Gluster-users] standby-server

Ted Miller tmiller at hcjb.org
Mon Aug 19 14:05:22 UTC 2013

>> -----Ursprüngliche Nachricht-----
>> Von: gluster-users-bounces at gluster.org
>> [mailto:gluster-users-bounces at gluster.org] Im Auftrag von Ted Miller
>> Gesendet: Freitag, 16. August 2013 18:29
>> An: gluster-users at gluster.org
>> Betreff: [Gluster-users] standby-server

>> I am looking at glusterfs for a HA application w/o local tech support (don't
>> ask, third-world country, techs are hard to find).

>> My current plan is to do a replica-4 + hot spare server.  Of the four in-use
>> bricks, two will be on "servers" and the other two will be on a "client"
>> machine and a "hot-backup" client machine.  No striping, all content on each
>> local machine, each machine using its own disk for all reading.

>> Part of my plan is to have a cold-spare server in the rack, not powered on.

>> (This server will also be a cold spare for another server).

>> I am wondering if this would be a viable way to set up this configuration:

>> Set up glusterfs as replica-5.

>> 1. server1
>> 2. server2
>> 3. client
>> 4. client-standby
>> 5. server-spare

>> Initialize and set up glusterfs with all 5 bricks in the system (no file
>> content).
>> Install system at client site, and test with all 5 bricks in system.

>> Shut down spare server.

>> Once a month, power up spare server, run full heal, shut down.
>> Power up server-spare for any software updates.

>> If server1 or server2 dies (or needs maintenance), tell them to power up
>> server-spare, and let it heal.

>> It seems to me that this would be easier than setting up a replica-4 system
>> and then jumping through all the hoops to replace a server from scratch.

>> Comments, reactions, pot-shots welcome.
>> Ted Miller

>> Ted Miller
>> Design Engineer
>> HCJB Global Technology Center
>> Elkhart, IN  46517

On 8/19/2013 2:38 AM, Daniel Müller wrote:
> What ist he reason about a "spare server" ?  With gluster just replicate to the real status all the time!?

This is a hot, tropical location with terrible power, a lot of lightning 
storms and only part-time air-conditioning.  Hardware failures are common.  I 
am doing what I can to protect against the power problems, but it is still an 
environment that is very hard on equipment.  This system will be 
business-critical--it is a radio station, and their music and other programs 
will be on the glusterfs, with downtime  beyond seconds becoming dead air.

If there is a catastrophic event, I want the spare server to have been off, 
and thus (most likely) not damaged.  It can be brought on-line to restore 
dual server status.

> Or just do geo replication to a non gluster machine!?

I plan on doing geo-replication, but restoring a multi-terabyte file system 
over a 4Mb link will take days.  We would probably have to rsync the file 
system to portable drives and fly them over.

Hope that helps the perspective a bit.

Ted Miller
> -----------------------------------------------
> EDV Daniel Müller
> Leitung EDV
> Tropenklinik Paul-Lechler-Krankenhaus
> Paul-Lechler-Str. 24
> 72076 Tübingen
> Tel.: 07071/206-463, Fax: 07071/206-499
> eMail: mueller at tropenklinik.de
> Internet: www.tropenklinik.de
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Ted Miller
Design Engineer
HCJB Global Technology Center
Elkhart, IN  46517

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