Contribution from Guillaume Unal concerning areas with no response 
and plans on treatment in reco.
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I leave it to Stefan to comment on the rate of OTX failure and   whether we can predict how many will be missing this fall.  (we have 5 (or 6 since this morning?) missing today out of ~ 1500)   (but of course not all Febs are egal in term of eta-phi coverage)
In term of software what we have /plan to have is:
- we can list missing Feb in the database with a word to tell that   this is a failure affecting readout and not L1 (Done)
- we plan to pre-digest this information such that in the AOD (from   the metadata part ) people would directly know  the affected region (eta-phi-calorimeter layer) without having to   access the conditions database and figure out the mapping    from feb to detector cells.  (this structure could also be used to   store HV affected regions)     Some basics code to fill this already exist, but the part of write   it in the medata is still missing
- to provide some correction relevant for Jet/Etmiss for these   problems, the idea is to use the L1 readout to estimate the energy in   the missing Feb    (with a granularity limited by the L1 sum: each readout cell in the   missing Feb in the same L1 sum wil have the same energy estimated)    This requires to take the L1 energy, subtract the energy in the   Febs which are in the readout to get the energy in the Feb with dead   OTX.    This is not an easy task as it requires a good knowledge of the L1   vs offline intercalibration and also some tricks to work for L1 tower    Et > 256 GeV (which is where the L1 saturates). At this stage, the   idea is to start to develop some software tools (some work has started)    but clearly the application of this correction in the   reconstruction will not be done during the first pass Tier0   processing but rather in a later    reprocessing
The first 2 points also applied to LVPS problem (we have none as of   today) but clearly the third point does not work  if the LVPS is off.   From the LAr only side there is nothing one could do. At the jet/  etmiss level, one would have to check tracks  and/or Tile energy (or   HEC/EMEC)  to either  attempt to correct or veto events with potential large energy deposit   in the affected region (in case of Met searches)