Hi listers! I have 2 nodes RAC(11R1 CRS&ASM and 10.2.0.3 DB). RHEL 4. From saturday in alert.log: Sat Feb 12 00:17:39 2011 Starting control autobackup Sat Feb 12 00:33:22 2011 Control autobackup written to SBT_TAPE device comment 'API Version 2.0,MMS Version 5.4.1.0', media '55757' handle 'c-1215503348-20110212-01' Sat Feb 12 06:01:28 2011 Thread 1 advanced to log sequence 4975 Current log# 2 seq# 4975 mem# 0: +DATA/boss/redo02a.log Current log# 2 seq# 4975 mem# 1: +RECOVERY_AREA/boss/redo02b.log Sat Feb 12 13:00:03 2011 Thread 1 advanced to log sequence 4976 Current log# 1 seq# 4976 mem# 0: +DATA/boss/redo01a.log Current log# 1 seq# 4976 mem# 1: +RECOVERY_AREA/boss/redo01b.log Sat Feb 12 13:00:19 2011 Starting control autobackup Control autobackup written to DISK device handle '+RECOVERY_AREA/boss/autobackup/2011_02_12/s_742914019.422.742914021' Sat Feb 12 13:03:24 2011 Starting control autobackup Control autobackup written to SBT_TAPE device comment 'API Version 2.0,MMS Version 5.4.1.0', media '55757' handle 'c-1215503348-20110212-03' That's all. In crsd.log: 2010-09-05 23:42:36.861: [ CRSRES][141155232] Start of `ora.boss.boss_taf.boss2.srv` on member `hqora01n2srv` succeeded. 2010-09-05 23:42:37.637: [ CRSRES][132918176] Start of `ora.boss.boss_taf.cs` on member `hqora01n1srv` succeeded. 2010-10-17 19:44:51.879: [ COMMCRS][2778004384]clsc_receive: (0xa648e8a0) error 2 2010-11-03 08:29:01.428: [ COMMCRS][2778004384]clsc_receive: (0x9f000538) error 2 2010-11-12 05:55:32.789: [ COMMCRS][2778004384]clsc_receive: (0x9f000528) error 2 2011-01-30 16:27:49.749: [ COMMCRS][2778004384]clsc_receive: (0xa0600bc8) error 2 [root@srv cssd]# /u01/app/oracle/product/11.1.0/crs/bin/crsctl start crs Attempting to start Oracle Clusterware stack The CRS stack will be started shortly [root@srv cssd]# /u01/app/oracle/product/11.1.0/crs/bin/crsctl check crs Failure 1 contacting Cluster Synchronization Services daemon Cannot communicate with Cluster Ready Services Cannot communicate with Event Manager [root@srv cssd]# /u01/app/oracle/product/11.1.0/crs/bin/crs_stat -t CRS-0184: Cannot communicate with the CRS daemon. Can you suggest me, what could be the reason? Best regards, Pavel.