Hi to all! We're using CentOS 5.5 64bits for our Plesk 11. This week we had the following problem 3 times... Suddenly, the server stops responding in all services (SSH, Apache, Postfix, ...) but ping works! After wait a few minutes (or 2 hours some times) the server continues unresponsive until we reboot. After reboot we search on /var/log/messages but cannot find useful information... Apr 11 14:56:05 s1 postfix/smtpd[8263]: SQL engine 'intentionally disabled' not supported Apr 11 14:56:05 s1 postfix/smtpd[8263]: auxpropfunc error no mechanism available Apr 11 14:56:42 s1 postfix/smtpd[8370]: SQL engine 'intentionally disabled' not supported Apr 11 14:56:42 s1 postfix/smtpd[8370]: auxpropfunc error no mechanism available Apr 11 14:56:47 s1 postfix/smtpd[8391]: SQL engine 'intentionally disabled' not supported Apr 11 14:56:47 s1 postfix/smtpd[8391]: auxpropfunc error no mechanism available Apr 11 14:56:47 s1 postfix/smtpd[8392]: SQL engine 'intentionally disabled' not supported Apr 11 14:56:47 s1 postfix/smtpd[8392]: auxpropfunc error no mechanism available Apr 11 16:55:42 s1 syslogd 1.4.1: restart. Apr 11 16:55:42 s1 kernel: klogd 1.4.1, log source = /proc/kmsg started. Apr 11 16:55:42 s1 kernel: Bootdata ok (command line is ro root=/dev/xvda1 console=xvc0 console=hvc0 xencons=hvc) Apr 11 16:55:42 s1 kernel: Linux version 2.6.18-194.26.1.el5xen ( mockbuild at builder10.centos.org) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-48)) #1 SMP Tue Nov 9 13:35:30 EST 2010 Apr 11 16:55:42 s1 kernel: BIOS-provided physical RAM map: Apr 11 16:55:42 s1 kernel: Xen: 0000000000000000 - 0000000080000000 (usable) Apr 11 16:55:42 s1 kernel: No mptable found. Apr 11 16:55:42 s1 kernel: Built 1 zonelists. Total pages: 524288 Apr 11 16:55:42 s1 kernel: Kernel command line: ro root=/dev/xvda1 console=xvc0 console=hvc0 xencons=hvc Apr 11 16:55:42 s1 kernel: Initializing CPU#0 Apr 11 16:55:42 s1 kernel: PID hash table entries: 4096 (order: 12, 32768 bytes) Apr 11 16:55:42 s1 kernel: Xen reported: 2009.260 MHz processor. Apr 11 16:55:42 s1 kernel: Console: colour dummy device 80x25 Apr 11 16:55:42 s1 kernel: Dentry cache hash table entries: 262144 (order: 9, 2097152 bytes) Apr 11 16:55:42 s1 kernel: Inode-cache hash table entries: 131072 (order: 8, 1048576 bytes) Apr 11 16:55:42 s1 kernel: Software IO TLB disabled Apr 11 16:55:42 s1 kernel: Memory: 2043384k/2097152k available (2513k kernel code, 53108k reserved, 1395k data, 184k init) Apr 11 16:55:42 s1 kernel: Calibrating delay using timer specific routine.. 5025.13 BogoMIPS (lpj=10050261) Apr 11 16:55:42 s1 kernel: Security Framework v1.0.0 initialized Apr 11 16:55:42 s1 kernel: SELinux: Initializing. Apr 11 16:55:42 s1 kernel: selinux_register_security: Registering secondary module capability Apr 11 16:55:42 s1 kernel: Capability LSM initialized as secondary Apr 11 16:55:42 s1 kernel: Mount-cache hash table entries: 256 Apr 11 16:55:42 s1 kernel: CPU: L1 I Cache: 64K (64 bytes/line), D cache 64K (64 bytes/line) Apr 11 16:55:42 s1 kernel: CPU: L2 Cache: 512K (64 bytes/line) Apr 11 16:55:42 s1 kernel: CPU: Physical Processor ID: 0 Apr 11 16:55:42 s1 kernel: CPU: Processor Core ID: 0 Apr 11 16:55:42 s1 kernel: (SMP-)alternatives turned off Apr 11 16:55:42 s1 kernel: Brought up 1 CPUs Apr 11 16:55:42 s1 kernel: checking if image is initramfs... it is Apr 11 16:55:42 s1 kernel: Grant table initialized Apr 11 16:55:42 s1 kernel: NET: Registered protocol family 16 Apr 11 16:55:42 s1 kernel: Brought up 1 CPUs Apr 11 16:55:42 s1 kernel: PCI: setting up Xen PCI frontend stub Apr 11 16:55:42 s1 kernel: ACPI: Interpreter disabled. Apr 11 16:55:42 s1 kernel: Linux Plug and Play Support v0.97 (c) Adam Belay Apr 11 16:55:42 s1 kernel: pnp: PnP ACPI: disabled Apr 11 16:55:42 s1 kernel: xen_mem: Initialising balloon driver. Apr 11 16:55:42 s1 kernel: usbcore: registered new driver usbfs Apr 11 16:55:42 s1 kernel: usbcore: registered new driver hub Apr 11 16:55:42 s1 kernel: PCI: System does not support PCI Apr 11 16:55:42 s1 kernel: PCI: System does not support PCI Apr 11 16:55:42 s1 kernel: NetLabel: Initializing Apr 11 16:55:42 s1 kernel: NetLabel: domain hash size = 128 Apr 11 16:55:42 s1 kernel: NetLabel: protocols = UNLABELED CIPSOv4 Apr 11 16:55:42 s1 kernel: NetLabel: unlabeled traffic allowed by default Apr 11 16:55:42 s1 kernel: NET: Registered protocol family 2 Apr 11 16:55:42 s1 kernel: IP route cache hash table entries: 65536 (order: 7, 524288 bytes) Apr 11 16:55:42 s1 kernel: TCP established hash table entries: 262144 (order: 10, 4194304 bytes) Apr 11 16:55:42 s1 kernel: TCP bind hash table entries: 65536 (order: 8, 1048576 bytes) Apr 11 16:55:42 s1 kernel: TCP: Hash tables configured (established 262144 bind 65536) Apr 11 16:55:42 s1 kernel: TCP reno registered Apr 11 16:55:42 s1 kernel: audit: initializing netlink socket (disabled) Apr 11 16:55:42 s1 kernel: type=2000 audit(1365692095.507:1): initialized Apr 11 16:55:42 s1 kernel: VFS: Disk quotas dquot_6.5.1 Apr 11 16:55:42 s1 kernel: Dquot-cache hash table entries: 512 (order 0, 4096 bytes) Apr 11 16:55:42 s1 kernel: Initializing Cryptographic API Apr 11 16:55:42 s1 kernel: alg: No test for crc32c (crc32c-generic) Apr 11 16:55:42 s1 kernel: ksign: Installing public key data Apr 11 16:55:42 s1 kernel: Loading keyring Apr 11 16:55:42 s1 kernel: - Added public key 12AFE3EA6A14161C Apr 11 16:55:42 s1 kernel: - User ID: CentOS (Kernel Module GPG key) Apr 11 16:55:42 s1 kernel: io scheduler noop registered Apr 11 16:55:42 s1 kernel: io scheduler anticipatory registered Apr 11 16:55:42 s1 kernel: io scheduler deadline registered Apr 11 16:55:42 s1 kernel: io scheduler cfq registered (default) Apr 11 16:55:42 s1 kernel: pci_hotplug: PCI Hot Plug PCI Core version: 0.5 Apr 11 16:55:42 s1 kernel: rtc: IRQ 8 is not free. Apr 11 16:55:42 s1 kernel: Non-volatile memory driver v1.2 Apr 11 16:55:42 s1 kernel: Linux agpgart interface v0.101 (c) Dave Jones Apr 11 16:55:42 s1 kernel: brd: module loaded Apr 11 16:55:42 s1 kernel: Xen virtual console successfully installed as xvc0 Apr 11 16:55:42 s1 kernel: Event-channel device installed. Apr 11 16:55:42 s1 kernel: Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2 Apr 11 16:55:42 s1 kernel: ide: Assuming 50MHz system bus speed for PIO modes; override with idebus=xx Apr 11 16:55:42 s1 kernel: ide-floppy driver 0.99.newide Apr 11 16:55:42 s1 kernel: usbcore: registered new driver hiddev Apr 11 16:55:42 s1 kernel: usbcore: registered new driver usbhid Apr 11 16:55:42 s1 kernel: drivers/usb/input/hid-core.c: v2.6:USB HID core driver Apr 11 16:55:42 s1 kernel: PNP: No PS/2 controller found. Probing ports directly. Apr 11 16:55:42 s1 kernel: i8042.c: No controller found. Apr 11 16:55:42 s1 kernel: mice: PS/2 mouse device common for all mice Apr 11 16:55:42 s1 kernel: md: md driver 0.90.3 MAX_MD_DEVS=256, MD_SB_DISKS=27 Apr 11 16:55:42 s1 kernel: md: bitmap version 4.39 Apr 11 16:55:42 s1 kernel: TCP bic registered Apr 11 16:55:42 s1 kernel: Initializing IPsec netlink socket Apr 11 16:55:42 s1 kernel: NET: Registered protocol family 1 Apr 11 16:55:42 s1 kernel: NET: Registered protocol family 17 Apr 11 16:55:42 s1 kernel: XENBUS: Device with no driver: device/vbd/51712 Apr 11 16:55:42 s1 kernel: XENBUS: Device with no driver: device/vif/0 Apr 11 16:55:42 s1 kernel: Initalizing network drop monitor service Apr 11 16:55:42 s1 kernel: Write protecting the kernel read-only data: 483k Apr 11 16:55:42 s1 kernel: USB Universal Host Controller Interface driver v3.0 Apr 11 16:55:42 s1 kernel: Fusion MPT base driver 3.04.13rh Apr 11 16:55:42 s1 kernel: Copyright (c) 1999-2008 LSI Corporation Apr 11 16:55:42 s1 kernel: SCSI subsystem initialized Apr 11 16:55:42 s1 kernel: Fusion MPT SPI Host driver 3.04.13rh Apr 11 16:55:42 s1 kernel: device-mapper: uevent: version 1.0.3 Apr 11 16:55:42 s1 kernel: device-mapper: ioctl: 4.11.5-ioctl (2007-12-12) initialised: dm-devel at redhat.com Apr 11 16:55:42 s1 kernel: device-mapper: dm-raid45: initialized v0.2594l Apr 11 16:55:42 s1 kernel: SGI XFS with ACLs, security attributes, large block/inode numbers, no debug enabled Apr 11 16:55:42 s1 kernel: SGI XFS Quota Management subsystem Apr 11 16:55:42 s1 kernel: Registering block device major 202 Apr 11 16:55:42 s1 kernel: xvda: xvda1 xvda2 xvda3 Apr 11 16:55:42 s1 kernel: netfront: Initialising virtual ethernet driver. Apr 11 16:55:42 s1 kernel: netfront: device eth0 has copying receive path. Apr 11 16:55:42 s1 kernel: EXT3-fs: INFO: recovery required on readonly filesystem. Apr 11 16:55:42 s1 kernel: EXT3-fs: write access will be enabled during recovery. Apr 11 16:55:42 s1 kernel: kjournald starting. Commit interval 5 seconds Apr 11 16:55:42 s1 kernel: EXT3-fs: recovery complete. Apr 11 16:55:42 s1 kernel: EXT3-fs: mounted filesystem with ordered data mode. Apr 11 16:55:42 s1 kernel: SELinux: Disabled at runtime. Apr 11 16:55:42 s1 kernel: type=1404 audit(1365692123.036:2): selinux=0 auid=4294967295 ses=4294967295 Apr 11 16:55:42 s1 kernel: input: PC Speaker as /class/input/input0 Apr 11 16:55:42 s1 kernel: Floppy drive(s): fd0 is unknown type 15 (usb?), fd1 is unknown type 15 (usb?) Apr 11 16:55:42 s1 kernel: Failed to obtain physical IRQ 6 Apr 11 16:55:42 s1 kernel: floppy0: no floppy controllers found Apr 11 16:55:42 s1 kernel: lp: driver loaded but no devices found Apr 11 16:55:42 s1 kernel: md: Autodetecting RAID arrays. Apr 11 16:55:42 s1 kernel: md: autorun ... Apr 11 16:55:42 s1 kernel: md: ... autorun DONE. Apr 11 16:55:42 s1 kernel: device-mapper: multipath: version 1.0.5 loaded Apr 11 16:55:42 s1 kernel: EXT3 FS on xvda1, internal journal Apr 11 16:55:42 s1 kernel: Filesystem "dm-0": Disabling barriers, trial barrier write failed Apr 11 16:55:42 s1 kernel: XFS mounting filesystem dm-0 Apr 11 16:55:42 s1 kernel: Starting XFS recovery on filesystem: dm-0 (logdev: internal) Apr 11 16:55:42 s1 kernel: Ending XFS recovery on filesystem: dm-0 (logdev: internal) Apr 11 16:55:42 s1 kernel: Filesystem "dm-1": Disabling barriers, trial barrier write failed Apr 11 16:55:42 s1 kernel: XFS mounting filesystem dm-1 Apr 11 16:55:42 s1 kernel: Starting XFS recovery on filesystem: dm-1 (logdev: internal) Apr 11 16:55:42 s1 kernel: Ending XFS recovery on filesystem: dm-1 (logdev: internal) Apr 11 16:55:42 s1 kernel: Filesystem "dm-2": Disabling barriers, trial barrier write failed Apr 11 16:55:42 s1 kernel: XFS mounting filesystem dm-2 Apr 11 16:55:42 s1 kernel: Adding 1959920k swap on /dev/xvda2. Priority:-1 extents:1 across:1959920k Apr 11 16:55:43 s1 kernel: ip_tables: (C) 2000-2006 Netfilter Core Team Apr 11 16:55:43 s1 kernel: Netfilter messages via NETLINK v0.30. Apr 11 16:55:43 s1 kernel: ip_conntrack version 2.4 (8192 buckets, 65536 max) - 304 bytes per conntrack Apr 11 16:55:44 s1 kernel: NET: Registered protocol family 10 Apr 11 16:55:44 s1 kernel: lo: Disabled Privacy Extensions Apr 11 16:55:44 s1 kernel: IPv6 over IPv4 tunneling driver Apr 11 16:55:44 s1 kernel: ip6_tables: (C) 2000-2006 Netfilter Core Team Apr 11 16:55:46 s1 xinetd[1426]: xinetd Version 2.3.14 started with libwrap loadavg labeled-networking options compiled in. Apr 11 16:55:46 s1 xinetd[1426]: Started working: 2 available services What can we do? what can we test? More information... Kernel: Linux 2.6.18-194.26.1.el5xen #1 SMP Tue Nov 9 13:35:30 EST 2010 x86_64 x86_64 x86_64 GNU/Linux RAM (in MB): total used free shared buffers cached Mem: 2048 1662 385 0 13 506 -/+ buffers/cache: 1142 905 Swap: 1913 0 1913 Disc usage: S. fitxers Mida En ús Lliure %Ús Muntat en /dev/xvda1 3.7G 1.9G 1.8G 52% / /dev/mapper/vg00-usr 13G 1.4G 12G 11% /usr /dev/mapper/vg00-var 66G 22G 45G 33% /var /dev/mapper/vg00-home 4.0G 4.2M 4.0G 1% /home none 1.0G 0 1.0G 0% /tmp CPU: processor : 0 vendor_id : AuthenticAMD cpu family : 16 model : 8 model name : Six-Core AMD Opteron(tm) Processor 2423 HE stepping : 0 cpu MHz : 2009.260 cache size : 512 KB physical id : 0 siblings : 1 core id : 0 cpu cores : 1 fpu : yes fpu_exception : yes cpuid level : 5 wp : yes flags : fpu de tsc msr pae cx8 apic cmov pat clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt lm 3dnowext 3dnow constant_tsc pni cx16 popcnt lahf_lm cmp_legacy cr8_legacy abm sse4a misalignsse bogomips : 5025.13 TLB size : 1024 4K pages clflush size : 64 cache_alignment : 64 address sizes : 48 bits physical, 48 bits virtual power management: ts ttp tm stc [6] [7] [8] Thank's! -- --- Salut!