From: Chris Petrolino <cpetrolino@xxxxxxxxx>
Subject: Re: [Xen-users] Xen Cloud Platform Problem
To: "inas mohamed" <inas_2003@xxxxxxxxx>
Cc: "xen-users@xxxxxxxxxxxxxxxxxxx" <xen-users@xxxxxxxxxxxxxxxxxxx>
Date: Sunday, June 26, 2011, 8:23 PM

Kind Regards,

Christopher James Petrolino

On Jun 26, 2011, at 4:33 AM, inas mohamed <inas_2003@xxxxxxxxx> wrote:

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:

To clarify, you are using XCP 0.5? If so I would definitely suggest upgrading to 1.0

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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