[Vdo-devel] impact of --emulate512 setting for VDO volumes

[Guillaume Pavese]

Hello,

We are planning to deploy VDO with oVirt 4.3 on centos 7.6 (on SSD devices).
As oVirt does not support 4K devices yet, VDO volumes are created with the
parameter "--emulate512 enabled"

What are the implications of this setting? Does it impact performance? If
so, is it IOPS or throughput that is impacted? What about reliability (is
that mode equally tested as standard mode)?

As I saw on RH Bugzilla, support for 4K devices in oVirt will need to wait
at least for Centos 7.7
Once that is supported, would it be possible to transition/upgrade an
emulate512 vdo volume to a standard one?

Thanks,

Guillaume Pavese
Ingénieur Système et Réseau
Interactiv-Group
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