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I am using Xen version 3.0.3 and running 4 domU's on this.(guest OS is windows) suddenly my dom0 reboots for no reason.This is happening frequently for last 2 days. I checked xend and system logs but unable to find any error related to this. Also there is no hardware related error.we are using Intel modular Server ( Blades ) IMS does not show any red flag for any hardware modules--disk,ram etc. multipath showing disk is active and ready

 mpath2 (2229300015561a075) dm-6 Intel,Multi-Flex
    [size=180G][features=1 queue_if_no_path][hwhandler=1 alua][rw]
    \_ round-robin 0 [prio=50][active]
     \_ 0:0:0:2 sdc 8:32  [active][ready]
    \_ round-robin 0 [prio=1][enabled]
     \_ 0:0:1:2 sdf 8:80  [active][ready]
    mpath1 (222b6000155984c79) dm-5 Intel,Multi-Flex
    [size=150G][features=1 queue_if_no_path][hwhandler=1 alua][rw]
    \_ round-robin 0 [prio=50][active]
     \_ 0:0:0:1 sdb 8:16  [active][ready]
    \_ round-robin 0 [prio=1][enabled]
     \_ 0:0:1:1 sde 8:64  [active][ready]
    mpath0 (22270000155a6178b) dm-0 Intel,Multi-Flex
    [size=8.0G][features=1 queue_if_no_path][hwhandler=1 alua][rw]
    \_ round-robin 0 [prio=50][active]
     \_ 0:0:0:0 sda 8:0   [active][ready]
    \_ round-robin 0 [prio=1][enabled]
     \_ 0:0:1:0 sdd 8:48  [active][ready]

I am using Xen version 3.0.3 and running 4 domU's on this.(guest OS is windows) suddenly my dom0 reboots for no reason.This is happening frequently for last 2 days. I checked xend and system logs but unable to find any error related to this. Also there is no hardware related error.we are using Intel modular Server ( Blades ) IMS does not show any red flag for any hardware modules--disk,ram etc. multipath showing disk is active and ready

mpath2 (2229300015561a075) dm-6 Intel,Multi-Flex
[size=180G][features=1 queue_if_no_path][hwhandler=1 alua][rw]
\_ round-robin 0 [prio=50][active]
 \_ 0:0:0:2 sdc 8:32  [active][ready]
\_ round-robin 0 [prio=1][enabled]
 \_ 0:0:1:2 sdf 8:80  [active][ready]
mpath1 (222b6000155984c79) dm-5 Intel,Multi-Flex
[size=150G][features=1 queue_if_no_path][hwhandler=1 alua][rw]
\_ round-robin 0 [prio=50][active]
 \_ 0:0:0:1 sdb 8:16  [active][ready]
\_ round-robin 0 [prio=1][enabled]
 \_ 0:0:1:1 sde 8:64  [active][ready]
mpath0 (22270000155a6178b) dm-0 Intel,Multi-Flex
[size=8.0G][features=1 queue_if_no_path][hwhandler=1 alua][rw]
\_ round-robin 0 [prio=50][active]
 \_ 0:0:0:0 sda 8:0   [active][ready]
\_ round-robin 0 [prio=1][enabled]
 \_ 0:0:1:0 sdd 8:48  [active][ready]

but in messages logs shows the following:

 Sep 11 09:16:23 primary1 kernel: Buffer I/O error on device sdd, logical block 0
    Sep 11 09:16:23 primary1 kernel: Buffer I/O error on device sdd, logical block 1
    Sep 11 09:16:23 primary1 kernel: Buffer I/O error on device sdd, logical block 2
    Sep 11 09:16:23 primary1 kernel: Buffer I/O error on device sdd, logical block 3
    Sep 11 09:16:23 primary1 kernel: Buffer I/O error on device sdd, logical block 0
    Sep 11 09:16:23 primary1 kernel: Buffer I/O error on device sdd, logical block 2097136
    Sep 11 09:16:23 primary1 kernel: Buffer I/O error on device sdd, logical block 2097151
    Sep 11 10:47:30 primary1 kernel: Buffer I/O error on device sdd, logical block 0
    Sep 11 10:47:30 primary1 kernel: Buffer I/O error on device sdd, logical block 2097151
    Sep 11 10:47:30 primary1 kernel: Buffer I/O error on device sdd, logical block 0
    Sep 11 10:47:30 primary1 kernel: Buffer I/O error on device sde, logical block 0
    Sep 11 10:47:30 primary1 kernel: Buffer I/O error on device sde, logical block 2

What could be possible cause for intermittent reboots? Dom0 had rebooted around 9:16 am and once before at 3:20am. At both these intervals messages log showed I/O error. Wonder if this is related? For other dom0 shows a few I/O errors in log but is quite stable

share|improve this question
    
If you haven't already, get mcelog and check if the machine encounters any serious exceptions. They may or may not make it in the iLO system logs. –  fuero Sep 11 '13 at 13:32
    
I installed mcelog but log is not getting generated.its giving error. mcelog: This CPU is unsupported. If you require MCE decoding support please upgrade to RHEL6. –  ganpya Sep 12 '13 at 6:06
    
any solutions for this? –  ganpya Sep 25 '13 at 8:34

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