PowerStore：PUHC 失败，并显示“系统遇到意外的后端错误。Please contact support”

在 PowerStoreOS 代码升级期间，升级前运行状况检查失败。

在 PowerStore 节点日志中，记录原因。

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.

解释
cyc_fs文件系统用于存储支持材料诊断文件，这些文件占用的空间通常是自动管理的。在极少数情况下，保留过多的支持材料导致cyc_fs中的可用空间不足。

使用 PowerStore Manager UI 或服务 shell 脚本svc_dc删除较旧的数据收集，以释放cyc_fs空间。