[Xen-users] Xen Cloud Platform Problem

[inas mohamed <inas_2003@xxxxxxxxx>]

Hi everybody,

I hope I'll find any one can help me in this big prblem.

I have 10 XCP hosts, some of them has more than 2 Virtal machines (max 4 VMs)

each host has:
Intel Quad Core i7 2.8Gig
2*1T HDD
1*1G NIC for internal use
1*100 Mbps connected to public network
12 GB RAM

for example for one of them (XCP 0.5) Host:

I installed 2 Centos VMs each with 3GB RAM, and 4VCPUs and 910 GB VHDD and 2 VNICs, I followed the documentation to install them. and I increased the Dom0 memory by editing /boot/extlinux.conf "dom0_mem=2940M" because I faced too many problems with default values and I thought it will be better if I increased the mem.

BUT NOW every 2 weeks " may be less" all my XCP hosts hanging and when I tried to check RAM using xentop I got:

xentop - 10:15:06   Xen 3.4.2
3 domains: 1 running, 2 blocked, 0 paused, 0 crashed, 0 dying, 0 shutdown
Mem: 12573752k total, 8600008k used, 3973744k free    CPUs: 8 @ 2809MHz
      NAME  STATE   CPU(sec) CPU(%)     MEM(k) MEM(%)  MAXMEM(k) MAXMEM(%) VCPUS NETS NETTX(k) NETRX(k) VBDS   VBD_OO   VBD_RD   VBD_WR SSID
  Domain-0 -----r     537556   13.1    2095872   16.7    2095872      16.7     8    0        0        0    0        0        0        0    0
Download B --b---      16500    2.0    3145728   25.0    3145728      25.0     4    2    59102  4239032    1        0    43473  2535945    0
User Profi --b---      16873    0.8    3145728   25.0    3145728      25.0     4    2    50837   339454    1        0    46217  2708478    0

and O/P from "free -m "
free -m
             total       used       free     shared    buffers     cached
Mem:          2047       1768        278          0        121        534
-/+ buffers/cache:       1112        934
Swap:          511          0        511

and from "top" only:
top - 10:17:25 up 24 days,  2:09,  1 user,  load average: 0.18, 0.24, 0.56
Tasks:  83 total,   2 running,  81 sleeping,   0 stopped,   0 zombie
Cpu(s):  6.0%us,  0.3%sy,  0.0%ni, 92.7%id,  1.0%wa,  0.0%hi,  0.0%si,  0.0%st
Mem:   2096132k total,  1810692k used,   285440k free,   123932k buffers
Swap:   524280k total,      200k used,   524080k free,   547272k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND                                                                                        
 5517 root      10 -10  930m 925m  948 S  8.7 45.2   8204:39 ovs-vswitchd                                                                                   
 1163 root      15  -5     0    0    0 S  1.3  0.0 428:06.76 netback   

and after restarting, every thing working fine again and after some time hanging again and when I am trying to ping my VMs some times I am getting timeout, and some times I am loosing data packets.
 I want to know why my XCP hosts hanging and not responding after sometime.
 
Any help will be appriciated,Please

Inas

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