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section 2.8.6 is outdated -- for RHEL 7.4 there is a new quorum implementation feature, a quorum device, which replaces the qdiskd functionality.

Lenko,
section itself is still valid - qdiskd was removed, votequorum was extended and extensions are documented in manpage. Qdevice (which is using votequorum) was added as tech preview in 7.3 and it's documented in rhel HA reference:

https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/High_Availability_Add-On_Reference/s1-quorumdev-HAAR.html

From my point of view adding something like "When external arbiter is need it's also possible to use qdevice" should do the job.

Let's ask Chris (manager) what he means. Chris, opinions, recommendations?

Lenka,

I think it's fine to leave section 2.8.6 as is.

QDevice (a new 7.3/7.4 features) was not present in RHEL 6 so I don't think we need to worry about it in the migration guide.  It does enable *some* behavior that was similar to qdisk, but I don't think it makes sense to call that out in this section.

Thanks,
Chris