PowerStore：PUHC 失敗，並顯示「系統遇到意外的後端錯誤。請聯絡支援部門」

在 PowerStoreOS 程式碼升級期間，升級前執行狀況檢查失敗。

從 PowerStore 節點日誌記錄中，會記錄原因。

Sep 28 22:56:54.847708 ASSET-A control-path[124493]: 2021-09-28 22:56:54.847 [NDU] [INFO] [com.emc.cyclone.contexts.infrastructure.ndu.application.NDUCommonUtil.ApplianceUpgradeUtil|vert.x-eventloop-thread-0] [72fee6ed-bc69-47f6-a4e3-05d8ac9deb1d|9b3b14a3-e90d-4fee-914d-1ac253b28bb1|fetchApplianceSessionInfo] Platform request to fetch appliance session id completed successfully1
 Sep 28 22:56:54.847772 ASSET-A control-path[124493]: 2021-09-28 22:56:54.847 [NDU] [INFO] [com.emc.cyclone.contexts.infrastructure.ndu.application.NDUCommonUtil.ApplianceUpgradeUtil|vert.x-eventloop-thread-0] [72fee6ed-bc69-47f6-a4e3-05d8ac9deb1d|9b3b14a3-e90d-4fee-914d-1ac253b28bb1|fetchApplianceSessionInfo] Is rollback failed state on the appliance upgrade session is null
 Sep 28 22:56:54.954970 ASSET-A control-path[124493]: 2021-09-28 22:56:54.954 [NDU] [INFO] [com.emc.cyclone.contexts.infrastructure.ndu.application.NDUCommonUtil.AwaitResponsesFromPlatformUtil|vert.x-eventloop-thread-0] [72fee6ed-bc69-47f6-a4e3-05d8ac9deb1d|9b3b14a3-e90d-4fee-914d-1ac253b28bb1|prestageHandleResponse] Platform request completed successfully
 Sep 28 22:57:24.996368 ASSET-A control-path[124493]: 2021-09-28 22:57:24.996 [NDU] [ERROR] [com.emc.cyclone.contexts.infrastructure.services.platform.gateway.application.upgrade.service.cycloneCommandService.PrestageUpgradePackageAS|vert.x-eventloop-thread-0] [72fee6ed-bc69-47f6-a4e3-05d8ac9deb1d]
 Prestage failed: (with error 'java.lang.Exception: ERROR: 15G free space is required. Clean up the space under /cyc_cfs and try again.

說明
cyc_fs檔案系統用來儲存支援資料、診斷檔案，其耗用的空間通常是自動管理的。在極少數情況下，保留的支援材料過多，導致cyc_fs中的可用空間不足。

使用 PowerStore Manager UI 或 service Shell 指令檔svc_dc移除較舊的資料收集，以釋出cyc_fs空間。