Lync SQL mirror troubleshooting

To move all DB back tpo the primary SQL run in the FrontEnd PowerShell 

Invoke-CsDatabaseFailover –PoolFQDN fepoolname.domain.loc –DatabaseType User –NewPrincipal primary -verbose

Invoke-CsDatabaseFailover –PoolFQDN fepoolname.domain.loc –DatabaseType User –NewPrincipal primary

Invoke-CsDatabaseFailover –PoolFQDN fepoolname.domain.loc –DatabaseType App –NewPrincipal primary

Invoke-CsDatabaseFailover –PoolFQDN fepoolname.domain.loc –DatabaseType CentralMgmt –NewPrincipal primary

Invoke-CsDatabaseFailover –PoolFQDN fepoolname.domain.loc –DatabaseType Monitoring –NewPrincipal primary

If Mirror is shown as suspended - log to current holder of primary SQL for this db and pass SQL query

ALTER DATABASE SET PARTNER RESUME

http://technet.microsoft.com/en-us/library/ms191125(v=sql.105).aspx

Then try again  Invoke-CsDatabaseFailover