On Wed, Jul 6, 2016 at 5:00 PM, Fernando Frediani <fernando.frediani@upx.com.br> wrote:

Hi Yaniv,

I have already done a fair amount of tunning to run a minimal OS from a USB stick and it seems to work reasonable well overtime, but nothing rock solid and of course I wouldn't try it myself in a production oVirt Node if that's not official.

For production I'd use boot from SAN, either via FC or iSCSI (HW adapter needed of course).

Even if it's not running in memory it's just a question to create a schema to avoid all unnecessary writes to permanent storage. Logs can be limited to a short period in memory (in another Console) or sent to a remote syslog server. It doesn't change much for the base OS to read anything it needs.
I thought I had seen these years ago during the development of the first versions of oVirt Node, but maybe I misunderstood or it was not considered for newer versions.

Perhaps there is something around this on some roadmap. As I mentioned, this is a significant saving for any platform not having to use any disks in the Compute Nodes.

Yes, would be cool to run it from SD card - but indeed you can't store logs there, as just the write speed alone will slow you down (write speed over time will degrade significantly in SDs, due to garbage collection).

Writing logs to memory is a bit of a problem - when you'll have issues, they might get lost. A better and more performant solution would be to write them to a remote server (rsyslog or such).

But really, running off the smallest SSD (64-128GB) is not very expensive (~50$ from ebay/amazon), fast and does not consume a lot of electricity.

Regards,
Fernando
Em 06/07/2016 10:40, Yaniv Dary escreveu:
oVirt node depends on the base OS support of the feature (Fedora\CentOS).
I have seen people do this online, but nothing official, so you can try it.
Yaniv Dary
Technical Product Manager
Red Hat Israel Ltd.
34 Jerusalem Road
Building A, 4th floor
Ra'anana, Israel 4350109

Tel : +972 (9) 7692306
        8272306
Email: ydary@redhat.com
IRC : ydary
On Wed, Jul 6, 2016 at 3:23 PM, Fernando Frediani <fernando.frediani@upx.com.br> wrote:

Hello there,

With oVirt 4.0 Release is running oVirt Node in a SD Card or USB Stick supported where the system boots in memory and only writes configuration changes to permanent storage similar to what VMware ESXi does ?

This is very useful and can save a significant amount on CAPEX and running costs depending on the size of the cluster.

Thanks
Fernando
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