9. ICMP9.2 ICMP HDDAbout ICMP HDDThe three HDDs (local storage) in the ICMP, are set up in a RAID 5 configuration. This storage technique, that combines multipleHDD components into a logical unit, manages enough redundancy information to continue to operate properly after the loss of oneHDD.Image 9-5C AUTION : A RAID 5 configuration with three HDDs allows a maximum loss of one disk. With the simultaneousloss of more than one HDDs, data is lost and the RAID must be completely initialized again after replacementof the defect HDDs with new HDDs!About degraded modeWhen a RAID array experiences the failure of one disk, it enters in degraded mode. Content storage and playback remains availableon the ICMP.C AUTION : The loss of one disk causes no serious consequences on the ICMP. But action must be takenquickly because the loss of a second disk will make the RAID system broken. The main cause of the total lossof RAID is due in most cases to the loss of the second disk while the first has not been rebuilt!A failed drive should be replaced as soon as possible.About “RAID recovery” processThe restoration from degraded to normal condition of the RAID 5 system is done automatically. When the RAID controller detects anew HDD to replace the failed disk the recovery procedure starts automatically.C AUTION : The automatic process does not work if more than one disk is lost. In that case the RAID must becompletely initialized again!About RAID brokenWhen more than one HDD is out of order, the RAID is considered as ’broken’ and the content is lost. The failed HDDs must bechanged and a new RAID must be created.Exchange or re-use of a disk setIt’s possible to have several sets of disks with one ICMP or to reuse a complete set of disks coming from another projector withICMP. It is sufficient to insert the three HDDs, from a valid RAID array, and let the system explore the new RAID. The mounting orderof the HDDs and the HDD slots do not matter. Of course, when using HDDs from another ICMP it is necessary to retrieve from thecontent distributor the KDMs corresponding to the content and the new ICMP.HDD storage capacityMake sure that all HDDs in the ICMP HDD set have the same storage capacity. See label on top of the HDD to know the storagecapacity.HDD storageThe maximum recommended storage period for the drive in a non-operational environment is 90 days. Drives should be stored in theoriginal unopened shipping packaging whenever possible. Once the drive is removed from the original packaging the recommendedmaximum period between drive operation cycles is 30 days. During any storage period the drive non-operational temperature,humidity, wet bulb, atmospheric conditions, shock, vibration, magnetic and electrical field specifications should be followed.R5906753 DPXK BLP SERIES 20/11/2017 95
