CentOS 5 :: Optimizing File Transfer Between KVM Guest And Host.
Oct 16, 2010
On my bare metal server, I get about 130MB/s read from a software RAID 10 array, but when reading the same file from a VM via NFS over the VirtIO interface,I only get about 40MB/s.
Furthermore, the process for the VM uses >180% CPU on the host, and ~40%, and the 5 min average is ~1.5 on the host and guest. I have dual E5620's so I'm disappointed that the transfer is so slow, as I was expecting at least 90MB/s.
I'm new to being a sysadmin, so if anyone has some tips I can use to increase the transfer rate, and possibility reduce the CPU load as well I'd appreciate it. I'm assuming that 130MB/s is the max speed of two 7.2k HDDs, but if there's any way I can squeeze any more out that would be great too.
System specs:
2x Intel Xeon E5620s @ 2.40Ghz
8GB of RAM @ 1066Mhz
4x 1TB Western Digital Black HDDs in RAID10
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Dec 9, 2009
I don't want to use image file as disk, but would like to allocate a disk for guest os. say it's /sda6, then do I need install guest os on host os? or can I install while the system is booting and only import a guest os from that? Do I have to mount the disk?
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Jan 5, 2011
I've found a workaround, but the workaround doesn't make any sense to me.I suspect I am running into a bug of some sort.I've tried to search for a solution, but the search terms are too broad and I can't seem to find anything useful.I have a CentOS 5.5 system that I've set up Virtualization on (presumably Xen, right?). I have a RHEL 5.4 Guest OS using "Full Virtualization" method.When I was installing the RHEL guest, the entire server rebooted just as the RHEL guest was booting for the first time.Thinking that odd, but coincidental, I just let the Host server reboot and then started up the RHEL Guest again.The reboot happened again and in the same spot! When I say the server rebooted, I mean black screen...pause...bios screen.I finally managed to get the RHEL Guest booted by removing the DVD that I had in the DVD drive and disconnecting it from the Guest OS in VMM. Very, very odd. I can reproduce this behavior by simply booting a Guest OS with a DVD in the drive (so far I've tried only RHEL guests).
The reboot happens at the same place in the Guest boot process. It's when RHEL starts the UDEV script. Actually, a few seconds after the RHEL system displays "Starting udev" message. I've looked in both the CentOS and RHEL messages log and found nothing.It's not a huge deal at this moment, but I will be sending these servers out into the field and I can't control what the end users of these systems put in the DVD drives.
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Sep 12, 2010
i am running Ubuntu on my VMWare Workstation. i cant get it work the built in file sharing that comes with VMWare Workstation(by instaling the VMWare tools). but i want to share files between my XP(host) and Ubuntu. i googled this but came up with no good results.
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Sep 18, 2009
Centos 5 was set up for me on my server with VMware and XP SP3 as a guest. I have little to no knowledge of centos (or anything Linux) so i tend to leave well alone but i am trying to get a USB printer to work from my networked pcs through XP - Through VMware - Through Centos5 to the USB port on the back of my server. I am reasonably OK with XP but am not a techie so will probably need to be walked through this.
I can see the printer appearing on Centos' equivalent to device manager and when i print everything seems ok with the XP print queue clearing after a few seconds but nothing prints. At a guess i need some sort of software bridge- (is this SAMBA?).
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May 27, 2010
I have ubuntu server as a guest in virtualbox and xubuntu as my host os. I have a shared folder on my host that can be accessed by my network. I'm trying to use my server without the need to install a desktop, so how would i transfer a file from my host machine to my ubuntu server guest?
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Mar 4, 2010
I am working on a cluster for a molecular dynamics class and I have to edit my FORTRAN code (only the newest and best for me!). In order to get through to the cluster I have to ssh in. The network on which the cluster resides is behind a firewall, so I have to ssh through the firewall into the network first.
this is fine, I can login and move files and folders as needed, including sftp-ing into host 1, then into the cluster so I can transfer files from cluster to host and then host to me. This gets rather tiresome, so it would be nice to edit the files in place.
The problem is that when I access my code with emacs it launches the emacs client on Host 1, with no mouse support. I know the purists will howl about how I should be using keyboard shortcuts, but I am a chemist and not a programmer, so the mouse is very nice for me. Is there any way I can perhaps mount the cluster using sshfs so that when I open my code it launches a local instance of emacs? Sorry if this is the wrong forum, but I thought it was network related.
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Oct 20, 2010
I have two servers, one has an empty / and the other has a subdirectory with a large number (4 gig) with many, many files. I need a way to transfer the files en masse from the server with the large number of files to the one that is essentially blank.I don't have space on the used host to simply gzip all the files. I've googled this and see that there may be some combination of tar and/or gzip that will let me do this with some sort of redirection.
I really need and example line of how this can be accomplished. If my explanation seems rather sparse, I can supply more details.
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Mar 10, 2010
i am trying to transfer a file from my live linux machine to remote linux machine it is a mail server and single .tar.gz file include all data. but during transfer it stop working. how can i work and trouble shooot the matter. is there any better way then this to transfer huge 14 gb file over network,vpn,wan transfer. the speed is 1mbps,rest of the file it copy it.
rsync -avz --stats bkup_1.tar.gz root@10.1.1.22:/var/opt/bkup
[root@sa1 logs_os_backup]# less remote.log
Wed Mar 10 09:12:01 AST 2010
building file list ... done
bkup_1.tar.gz
deflate on token returned 0 (87164 bytes left)
rsync error: error in rsync protocol data stream (code 12) at token.c(274)
building file list ... done
code....
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Feb 24, 2010
I have started on CentOS 5.3 VNC server. I am connected to CentOS from a workstation under control of Windows XP using UltraVNC. Connection passes normally, but I cannot transfer files. By pressing Ctrl+Alt+F7 the message: "The connected VNC Server does not support UltraVnc File Transfer".
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Feb 24, 2011
I have two questions. 1- How can I set up FTP server for the first time on the Centos? 2-I want to give the ftp user full root access in the directory of /var/www/html so he would be able to upload or download files and folders without getting "FTP Critical file transfer error". From command prompt how can I give the user test root access in the /var/www/html with all the folders, sub folders and files in one shut?
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Sep 20, 2010
I have a centos server installation running, and have installed and configured vsftpd.
FileZilla works great. I am able to connect and transfer files both ways. I used this just for testing purposes.
What I need to do is get Fling File Transfer working. I can connect to vsftpd with Fling, but that is as far as it goes.Sep 20 11:18:44 ftp vsftpd[28286]: warning: can't get client address: Socket operation on non-socketSep 20 11:31:03 ftp avahi-daemon[2240]:
Fling's logfile shows this:
11:25:57 Connect: 192.168.40.41
11:25:57 Connect: 192.168.40.41 Ok
11:25:57 Upload: C:UsersPublicDocumentsFling 1
[code]....
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Oct 6, 2015
im new to virtualbox and i run linux arch as guest os. now my question is how it can be that the vm has the same ip as my host os.
this is suppose to be diffrent machine isnt it? and how to configure my guest vm to be completely unrelated to my host
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Feb 2, 2009
My Windows guests see my VMware Host Only folders as \.hostShared Folders. But when I try to see them from a Linux guest, all I get is frustrated. No permutation of that seems to work. Because the Windows guests see the shared folders I know the host is doing its part in providing them. After two days of not finding an answer on the VMware Workstation forum I finally figured out that the problem really is how to look for them with Linux. With Linux I can turn off all NICs accept the Host Only NIC, put smb://172.16.138.1 into the address bar and see all the shares on the host, but not the folder designated as the host only folder. How to look for the shares with Linux?
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Aug 28, 2010
I have installed Red Hat Eterprise Linux as a Guest OS using VirtualBox on the Host OS Windows XP SP 2 on my PC. I want to access my local / intranet web site from this Guest OS which is running on the top of on Windows XP, the Host OS. I am not sure as to what IP Settings I need to do. Though I am able to access Internet from both the OSes. The IP of this Guest OS is:
Code:
[root@localhost ~]# ifconfig eth0
eth0
Link encap:Ethernet HWaddr 08:00:27:30:E9:72
inet addr:10.0.2.15 Bcast:10.0.2.255 Mask:255.255.255.0
inet6 addr: fe80::a00:27ff:fe30:e972/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1871 errors:0 dropped:0 overruns:0 frame:0
TX packets:1926 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1427538 (1.3 MiB) TX bytes:415769 (406.0 KiB)
Interrupt:11 Base address:0xd020
[root@localhost ~]#
I have installed Microsoft Self Loop Adapter (Autoconfiguration IP Address: 169.254.25.129) on the Host OS Windows XP. There is another adapter: VirtualBox Host-Only Network whose IP Address is: 192.168.56.1. So, how can we access intranet web site from the Host OS to Guest OS and vice versa. I also want to access this virtual Red Hat machine /console from within windows XP using PUTTY application. From Windows XP the Red Hat machine is pinging. But when I use the IP to access the machine through PUTTY it doesn't work.
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May 12, 2010
i have installed virtualbox on centos , and installed xp as a guest os. my LAN is on 10.200.2.x/24 network inorder to avoid conflict i have given centos ip as 10.200.2.191/24 and a virtual ip 192.168.56.4/24 my gateway is 10.200.2.1 i am able to ping from my guest os to host os the ip address but not the gateway inorder for internet connectivity
some of the configuration of virtual box
Display
Video Memory:
16 MB
3D Acceleration:
[Code]....
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Feb 3, 2009
My Windows guests see my VMware Host Only folders as \.hostShared Folders But when I try to see them from a Linux guest, all I get is frustrated. No permutation of that seems to work. Because the Windows guests see the shared folders I know the host is doing its part in providing them. After two days of not finding an answer on the VMware Workstation forum I finally figured out that the problem really is how to look for them with Linux. With Linux I can turn off all NICs accept the Host Only NIC, put smb://172.16.138.1 into the address bar and see all the shares on the host, but not the folder designated as the host only folder.
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Dec 9, 2009
I have VirtualBox v3.1.0 r55467 running on f12 2.6.31.6-162.fc12.i686. The guest is Windows XP SP3. I need to enable bridged mode for the virtual network interface on the guest. Everytime I enable bridge mode the following error occurs.
Quote:
Failed to start the virtual machine Windows XP. Failed to open/create the internal network 'HostInterfaceNetworking-wlan0' (VERR_SUPDRV_COMPONENT_NOT_FOUND). One of the kernel modules was not successfully loaded. Make sure that no kernel modules from an older version of VirtualBox exist. Then try to recompile and reload the kernel modules by executing '/etc/init.d/vboxdrv setup' as root (VERR_SUPDRV_COMPONENT_NOT_FOUND). When I run '/etc/init.d/vboxdrv setup' i get the following compilation error:
Quote:
Stopping VirtualBox kernel module [ OK ]
Removing old VirtualBox netadp kernel module [ OK ]
Removing old VirtualBox netflt kernel module [ OK ]
[code]....
dmesg gives me nothing. I have scoured the web .. and even asked on #vbox and #fedora cant get.
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Jan 3, 2010
I have tried a few times already the following procedures: start a new installation (each time, I create a new VBox VM) with the Fedora 12 DVD iso attached to the DVD drive of the VM. I select the default setting, like US english, US keyboard, local time (GMT +8), standard installation ... etc). The installation process had been smooth to the screen the system asking for a reboot after installing something like 1100+ packages. Then I click the reboot button offered. The VM restarted but each and every time, it came up with the following error message:
Booting from local disk...
FATAL: INT18: BOOT FAILURE
There was no other error message durint the installation process. It would be very much appreciated if some one can tell me what went wrong and how to solve it. I believe even I try again the same way, it will end up with same result. Is it a software or hardware problem? In case software problem, is it Fedora or VirtualBox?
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Jul 5, 2011
I have Linux installed on my harddrive, sometimes I run it as the host operating system and sometimes run it as a guest in Windows using VirtualBox. It's a nice ability, I think.
I don't think it's possible with Windows though. Is it because your average distribution includes drivers for everything known to man? Are devices/drivers configured statically in Windows so when somethings changed it breaks?
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May 16, 2010
Is it possible to read the host cpu's temperature from a virtual guest?
(1) Where host = ubuntu desktop and guest = ubuntu server, and
(2) Where host = windows xp and guest = ubuntu server?
Typically I would read the contents of /proc/acpi/thermal_zone/THRM/temperature on host ubuntu desktop. I guess its more tricky when running ubuntu on windows host. What I am trying to do is shutdown guest if host cpu temperature is greater than certain value.
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Jun 28, 2010
I am using virtualbox 3.2.4 (virtualbox host only network (NAT)) on Windows XP Host and an ubuntu 10.04 guest. Recently installed vsFTPd on ubuntu guest and I am able to FTP from ubuntu to localhost. But when I try from the windows host I got an unknown connect error. I try with anonymous users enabled too.
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Sep 9, 2010
Quote:
I'm working in php / mssql project and I'm working on php side. I try VirtualBox to access to mssql from linux. I'm using VirtualBox 3.2.8(Downloaded from VirtualBox website) Hosted On Ubuntu 10.04, and my Guest OS is Windows 7. I followed some tutorials on how to connect from host to guest, but all failed... how to connect from ubuntu (host) to windows 7 (guest)
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Dec 7, 2010
I'm running Ubuntu 10.10 desktop in a VirtualBox VM on a Windows 2008 host machine. The end goal is join the the Ubuntu VM to a Windows 2008 domain. I've downloaded likewilikewise-open_5.4.0.42111-2ubuntu1.2_i386.deb se-open_5.4.0.42111-2ubuntu1.2_i386.deb to get the joining of the VM to the domain. But from this point forward, I'm completely lost.
1) How do I implement this likewise package?
2) How do I get files from my Windows 2008 host to the Ubuntu guest VM?
The likewise file is burned to a DVD. When I try to read the DVD, I get the "My Disk" icon but only one file gets displayed. In other words, the DVD the likewise file is burned to has a ton of files. Ubuntu doesn't see any of them expect one .exe file. The /etc/fstab had no entry for cdrom, so I put a line in that says
/dev/hdc /media/cdrom0 udf,iso9660 user,noauto 0 0 rebooted and that didn't do squat. There is no entry /etc/cdrom but there is directory /etc/My Disc. And I suppose that's what gets mounted because I can see one file on that disc. So then I thought, to hell with the DVD drive and I'll just get the Linux guest to see a "shared drive" on the host. I shared out a folder on the host via the Virtualbox "shared folders". But how I get the Ubuntu guest to see this shared folder is as big a mystery to me as is the creation of life.
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Sep 14, 2010
I have VMWare on a notebook, guest Windows running on Linux host. The network in that virtual machine is configured as NAT. I want to share/transfer files from Linux (host) to Windows (guest). So I leave sshd always running on the notebook, I go into Windows and run an SSH/SFTP program. My Wifi router has address 192.168.1.1, my desktop has address 192.168.1.2 and my notebook has address 192.168.1.3. On the notebook, that SSH/SFTP program connects to 192.168.1.3 (i.e. the notebook itself) and everything works fine. But it's a notebook, and when I leave home with it, 192.168.1.3 is no longer accessible. How can I let the guest OS connect to the host OS when I'm away from my Wifi network?
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Mar 5, 2009
I have rhel5 as host and guest is xp and rhel5, how will I make a network between them.
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Apr 14, 2010
i just want to run linux(guest) on winxp(Host)on vmware. where i download linux guest. and how i installed the same in vmware runing on winxp.
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Mar 22, 2011
I have a host with 4 VMs on it. How do I move them to another host? The first host is dying and I want to move the VMs to another host. I tried to copy the files under /vms from one host to another and then copy the files under /etc/libvirt/qemu to the other host. I then ran "virsh" and it does not see them.
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Jan 26, 2010
pretty comfortable at the command line and in kde. found 2 'supplementary kernel drivers' for virtualbox at slackbuild (thank you heinz!). followed the how-to at slackbuild and built and installed both packages, but additions weren't working. (i thought they were standalone) noticed the 'supplemental' in their description, and so installed the guest additions for linux from vbox site. additions still not working. at this point i start restarting my slackware vm, and redoing everything in various sequences. finally, additions work! but i'm not sure why! critical pieces and sequence for getting guest additions working once i have slackware installed?
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Jan 1, 2010
Having a bit of a issue with Debian Squeeze and transferring files to the Sony PSP..Hook up PSP to USB port and Debian mounts it..I go to drag a 125 meg mp4 to video folder..Copy windows takes about 10 seconds to transfer it..Exit USB mode and there is no video there. Go back into USB mode and look at video folder on the PSP memory stick and there is no video..It vanished. From another after copy progress closed I right clicked PSP and unmounted it..
It error-ed saying device was busy and could not unmount..Looking at light on PSP i see memory stick is still being written to..i wait for light to stop flashing..About a minute or so..Then am able to unmount it..Go to PSP video and theres the video ready to be watched. Debian isnt accurately showing the copy progress...Its showing complete when it isnt..I have to watch the light on PSP to know when it is truly finished.
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