High CPU when create a Snapshot

[Geomix7]

Dear All ,

During the snapshot process (I fill the name and then ok) I received a message “unable to connect to server”).

The CPU of the server went 100% .See the output of the TOP command: top - 09:43:27 up 216 days, 16:03, 1 user, load average: 12.21, 13.68, 8.50 Tasks: 230 total, 1 running, 229 sleeping, 0 stopped, 0 zombie %Cpu0 : 0.0 us, 1.5 sy, 0.0 ni, 24.2 id, 74.2 wa, 0.0 hi, 0.0 si, 0.0 st %Cpu1 : 0.0 us, 1.5 sy, 0.0 ni, 63.1 id, 35.4 wa, 0.0 hi, 0.0 si, 0.0 st %Cpu2 : 1.5 us, 1.5 sy, 0.0 ni, 0.0 id, 97.0 wa, 0.0 hi, 0.0 si, 0.0 st %Cpu3 : 0.0 us, 1.5 sy, 0.0 ni, 0.0 id, 98.5 wa, 0.0 hi, 0.0 si, 0.0 st

Finally the snapshot completed but my concern is that behavior occur on 3 different Management servers R80.30 , R80.40 .The common is that all 3 systems are VMware on ESXi .

Thanks

[Timothy_Hall]

Gah, during the snapshot 74.2 wa & 97.0 wa which is waiting for (disk) I/O?  Your disk path is wayyyyy too slow and/or oversubscribed/congested which is unfortunately very common in virtual environments and I've seen it many times.  When your CPU is 97% waiting for I/O, 97% of CPU time is unavailable because the CPU is blocked waiting for your slow disk.  So yeah your system will probably not be responding if only 3% of its CPU cycles are available to service your request.