Dear Simone,

Thanks for the response. Unfortunately I didn't get the install up to 4.7 in 
time for this event, so we might go down the spare host route just to be triple 
safe pending the arrival of some networking kit.

Regards,
Callum

--

Callum Smith
Research Computing Core
Wellcome Trust Centre for Human Genetics
University of Oxford
e. [email protected]<mailto:[email protected]>

On 18 Dec 2018, at 10:08, Simone Tiraboschi 
<[email protected]<mailto:[email protected]>> wrote:



On Mon, Dec 17, 2018 at 2:24 PM Callum Smith 
<[email protected]<mailto:[email protected]>> wrote:
Dear All,

So we've had some major disk corruption on our hosted engine (hardware to 
blame), and we have taken backups. However, the hosted-engine VM will no longer 
boot at all, database is thoroughly corrupted, and we need to rebuild the 
thing. Just a sanity check on the best route:

Preamble:
VMs are still running fine - only hosted engine affected
VMs are distributed across our entire 3 node cluster
All 3 nodes are registered as hosted engine candidates

1. Do another hosted-engine --deploy on one of the existing hosts, and then 
restore the backup into that
2. Build a new host, deploy the hosted-engine, then restore a backup on a fresh 
node

Hi,
since 4.2.7 you can use
hosted-engine --deploy --restore-from-file=backup.tar.gz

And the deployment will restore your backup on the fly.
Technically you an also use one of the existing hosts with running VMs but if 
you want to be on the safe and you have a spare host I'd suggest to use that 
one.
You will be asked to create a new SD for the new engine VM, the previous HE SD 
will be still visible in the engine if you have to migrate other disks stored 
there.



Regards,
Callum

--

Callum Smith
Research Computing Core
Wellcome Trust Centre for Human Genetics
University of Oxford
e. [email protected]<mailto:[email protected]>

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