Console system for J-PARC Main Ring (MR) was designed in 2007 and had been used for accelerator commissioning and operation since then. It was composed of 20 diskless thin clients and 10 blade servers. Both of them are PC-based computers running Scientific Linux (SL) 4 as their operating system. In 2013, migration to ordinary fat clients was triggered by update from SL4 to SL6. Intel NUC was selected based on result of preliminary investigation and use experiences of those thin clients. Its evaluation was carried successfully out during commissioning of MR. Thin clients were replaced by 22 NUCs that work as fat clients. Migration scenario and technique of managing console system are discussed.
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