LyncServer UpgradeReadinessState always Busy

Question

Hallo,
we have a Lync2013 Enterprise Pool with 2 Frontendservers deployed (+1 Mediation Server + 1 EdgeServer). I want to update the Lync Environment to the latest Cu but it always (since 8 hours) returns busy when I run get-CsPoolUpgradeReadinessState. 
All Servers are Active (see Output of the Commands below).
Another Post in this Forum suggests that a missing database update could cause this. But I checked the Databaseversions and all databases seems up-to-date.
Do you have any Ideas?
Regards
Thomas
PoolName             : hqpool.company.com
State                : Busy
TotalFrontends       : 2
TotalActiveFrontends : 2
UpgradeDomains       : {
                       UpgradeDomainName: UpgradeDomain1
                       IsReadyForUpgrade: False
                       Total FrontEnds: 1
                       Total Active FrontEnds: 1
                       Frontends: lyncfe01.company.com
                       UpgradeDomainName: UpgradeDomain2
                       IsReadyForUpgrade: False
                       Total FrontEnds: 1
                       Total Active FrontEnds: 1
                       Frontends: lyncfe02.company.com
Checking...
        pool fqdn: hqpool.company.com
  front end fqdns: lyncfe01.company.com
                   lyncfe02.company.com
 primary sql fqdn: sql01.company.com
Local Databases: (lyncfe01.company.com)
DatabaseName ExpectedVersion InstalledVersion UpdateRequired
lyss         12.32.2         12.32.2          no
rtc          125.6.3         125.6.3          no
rtcdyn       125.6.3         0.0.0            no
xds                          10.13.2          no
Backend Databases:
DatabaseName ExpectedVersion InstalledVersion UpdateRequired
cpsdyn       1.1.2           1.1.2            no
LcsCDR       39.82.2         39.82.2          no
LcsLog       24.40.0         24.40.0          no
lis          3.1.1           3.1.1            no
QoEMetrics   62.90.1         62.90.1          no
rgsconfig    5.5.1           5.5.1            no
rgsdyn       2.2.1           2.2.1            no
rtcab        62.42.2         62.42.2          no
rtcshared    5.0.1           5.0.1            no
rtcxds       15.13.1         15.13.1          no
xds          10.13.2         10.13.2          no
Central Management Databases:
DatabaseName ExpectedVersion InstalledVersion UpdateRequired
lis          3.1.1           3.1.1            no
xds          10.13.2         10.13.2          no

Answer 1

Hi,
If you see Busy for at least three consecutive times, after waiting 10 minutes in between each attempt, or if you see any result of
InsufficientActiveFrontEnds for
PoolUpgradeState, then there is an issue with the pool. If this pool is paired with another Front End pool in a disaster recovery topology, you should fail the pool over to the backup
pool, and then update the servers in this pool. For details, see
Failing over a pool in Lync Server 2013
More details:
http://technet.microsoft.com/en-us/library/jj204736.aspx
Best Regards,
Eason Huang
Eason Huang
TechNet Community Support