[DRBD-user] Updating/Reinstalling the Operational System (best practices)

J.R. Lillard jlillard at ghfllc.com
Thu Jun 7 15:51:29 CEST 2012

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.

I can't answer your question because I use Ubuntu and updating the OS is
fairly simple.  But I did want offer some advice.  I also started out
having my DRBD nodes mounting their storage over iSCSI.  It worked fine but
I got significant performance improvements by using local storage instead.
 In my situation I was able to pull the hard drives out of the NAS and put
them directly in the server.

On Thu, Jun 7, 2012 at 8:43 AM, Marcelo Pereira <marcelops at gmail.com> wrote:

> Hello Everybody,
> I have got a very simple (and probably basic) question.
> What are the best practices when updating the "operation system" where I
> have a DRBD volume?
> Here is the map of my servers:
>    - Linux (CentOS 5.8)-- this is my *primary* server, which the DRBD
>    tools installed in
>       - OpenFiler (this is my *primary* hot-swapable storage unit)
>    - Linux (CentOS 5.8)-- this is my *secondary* server, which the DRBD
>    tools installed in
>       - OpenFiler (this is my *secondary* hot-swapable storage unit)
> Each Linux server mounts the volume from his related OpenFiler unit
> through iscsi, and then I use DRBD to mirror them. It's working perfectly
> now.
> I had to do some maintenance a couple of months ago, updating the CentOS
> from 5.2 to 5.8, which was very straightforward. Then I updated the DRBD
> from 8.2.6 to 8.3.12, which was pretty good as well.
> Now I need to update the operational system, from CentOS 5.8 to CentOS
> 6.2, and I can't do it as a simple software update (since CentOS doesn't
> support such a feature). That said, I will have to reinstall to SO on the
> servers (I'm not touching the storage units, though).
> What would be a best practice in this case, in order to "replace" these
> servers and keep the storage units the way they are now? I wish I could
> simply reinstall the OS, remap the units, configure DRBD and sync, but I
> want to know what is the golden path to do so.
> Thanks,
> Marcelo
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J.R. Lillard
System / Network Admin
Web Programmer
Golden Heritage Foods
120 Santa Fe St.
Hillsboro, KS  67063
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