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• Error while trying to configure VLAN with Open vSwitch

  - by Abhishek Chanda

  I am trying to connect a number of VMs using Open vSwitch. The VMs are on two separate physical boxes. Here is what I did: Created two tap devices on one physical host sudo ip tuntap add mode tap tap0 and same for tap1 Bring them up sudo ip link set tap0 up Add them as ports to Open vSwitch (br0 was created as a OVS bridge previously) sudo ovs-vsctl add-port br0 tap0 tag=1 Now I booted the VMs (using VirtualBox) and assigned addresses 192.168.122.11 and 192.168.122.12. Now when I try to ping one VM from another, I get the error Connect: network is unreachable. Since both VMs are connected to the switch on the same VLAN, I expect to be able to ping one from another. What is going wrong here?

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• VMware + SQL Server - sqlserver.exe not using both CPU cores

  - by fistameeny

  Hi, I am working on a virtual machine that runs SQL Server Express (as part of Sage Line 50 Manufacturing). The details are as follows: Physical Server (host machine) - Intel Xeon Quad Core 2.1GHz - 4GB RAM - VMDK image stored on RAID-5 500GB SATA drives (7200RPM) - Running Ubuntu 10.04 Server 64 bit - VMware Server 2 Virtual Machine - Windows Small Business Server 2003 - Allocated 2 vCPU's and 2GB RAM - Using 100GB pre-allocated flat VMDK file The problem I have is that there is process that runs in SQL Server that is CPU intensive. On the old physical server that we migrated to the virtual machine from, this would utilise both CPU cores so the sqlserver.exe process would be running 100% on each of the CPU cores. On the virtual machine, it only seems to use one of the two CPU cores, meaning that the process is much slower to run. Question Is there a way to force SQL Server (sqlserver.exe process) to use both of the CPU cores, and distribute it's load between them? Is this a VMware setting that needs changing to allow processes to use both cores?

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• Terminal Server 2003 Performance Troubleshooting

  - by MikeM

  Let me get your thoughts on terminal server performance problems. The server hosts average 25 users which, after running some numbers, on average use 600MB memory with their main applications running (web browser, adobe reader, IP phone client). All users are on the same LAN as server. We constantly experience slow response and short session lockups. Combined CPU usage is on average 10%. What appears strange to me is that the system shows 29GB physical memory with 25GB of it free. The page file usage is about 50% averaging 9GB used. Some server specs OS: Server 2003 32bit Enterprise with /PAE flag RAM: 32GB CPU: 2xQuad Core @ 2.27Ghz HD: RAID5 1.2GB After doing basic troubleshooting using performance monitor it leads me to believe that the performance problems are caused by the 32bit OS limitation in addressing full 32GB of physical memory even though the /PAE flag is used. Can anyone suggest something, troubleshooting steps that can lead to a more conclusive answer? Thanks

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• Server 2012 intermittently fails to respond to pings from single host, even with firewall disabled, but responds to non-ICMP requests fine

  - by James Westbury

  This one is kind of weird. I've got the following machines involved: DC01 - 10.1.2.42, Server 2012, domain controller & DNS server, physical machine nagiosv - 10.1.2.35, CentOS 6.4, Nagios, virtual machine CB01 - 10.1.3.81, Ubuntu 12.04 LTS, couchbase server, virtual machine So, I noticed something was wrong while configuring this new Nagios VM. I started seeing DC01's state flapping. I logged into nagiosv when I saw this happening, and attempted to ping DC01, both by FQDN and its IP address. Neither worked. I tried pinging the machine from CB01, which is another VM on the same virtual switch/physical NIC as nagiosv, and that worked fine. Pings still failing from nagiosv at this time. DC01 is also an internal DNS server, so I ran dig google.com from nagiosv, and was able to run a query against DC01 just fine: ;; Query time: 1 msec ;; SERVER: 10.1.2.42#53(10.1.2.42) ;; WHEN: Fri Nov 1 07:53:51 2013 ;; MSG SIZE rcvd: 204 Pings still failing from nagiosv, though. I can ping from DC01 to nagiosv, and that works, and I can still ping from other VMs on the same physical NIC into DC01, and that works. I should mention at this point that I've disabled the firewall on DC01 for testing purposes, and it doesn't make a damned bit of difference. (Even with the firewall enabled, I have a blanket exception for ICMP from the local subnet, so it shouldn't make a difference, but I figured I should test it anyway.) I loaded up Wireshark on DC01 and pinged it from nagiosv again. What I see is a bunch of echo requests coming in and not a single reply going back out. Filtered results here, showing all ICMP traffic during a 15-second period. A few more bits of info: There are no IP conflicts on the network. MAC addresses on the incoming pings match the MAC on the VM. There are no duplicate MACs on the network, as far as I can see. I have absolutely no idea why DC01 is failing to respond, here. Any ideas?

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• Windows RRAS multi-network routing

  - by Brent Pabst

  I am looking for advice, comments and suggestions from anyone who has used Windows RRAS (2008 R2 Pref.) as the primary routers for our multiple offices. We have multiple physical office locations and are looking into utilizing Windows Server 2008 R2 Core as redundant Active/Active routers/gateways for our network as opposed to a physical router from Cisco or Juniper, it costs a lot less! Any problems, issues or documentation anyone would recommend? We will still most likely have a firewall on the edge but the majority of our traffic will be inter-office with some external services. We will be using multiple Class B networks across our two offices.

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• How can I start an X11 session on my headless Fedora 13 server?

  - by DR

  I have a small home server using Fedora 13 as operating system. Since the upgrade to Fedora 13 I cannot start the X11 server. (I need it to use vnc) When I try to start the server, both the nouveau and the original NVIDIA driver claim that there's no physical monitor attached (which is true) and that the X server cannot start because the initial display modes cannot be probed. I tried to manually add the display modes to xorg.conf but they seem to be ignored. Some forums suggest to simply use the VESA driver in this situation, but since I can't get it run either (different, more obscure message) I want to get it working with the nouveau driver as a matter of principle. Temporarily attaching a monitor would mean a lot of work for me ( 1 hour and currently it's almost 35°C/95°F in my home) I want to try that only if that definitely fixes the problem and stays that way if I remove the monitor again) How can I make the driver work without having a physical monitor attached? Thank you for your time and your help!

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• How to Virtualize an OEM windows install.

  - by jumentous

  I've bought a new computer and like always it comes with windows 7 pre-installed. I'm a linux user by default but i still keep a virtual windows installation around. Is it possible to install my linux distribution, and use the OEM license that came with the computer to create the virtual instance? I have no intention of moving the license off the physical machine so i'm sure i could argue that i'm not violating the license but i don't expect that this would work and activate without great legal battles. So in the event that this doesn't work what other options do i have? Can i shrink the physical partition and have Qemu boot it? My thoughts are that windows would detect the change in hardware and fail. What can i do with this windows install as a linux user?

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• Nagios remote monitoring: NRPE Vs. SSH

  - by sam

  We use Nagios to monitor quite a few (~130) servers. We monitor CPU, Disk, RAM and a few other things on each server. I've always used SSH to run the remote commands, purely because it requires little to no additional config on the remote server, just install nagios-plugins, create the nagios user and add the SSH key, all of which I've automated into a shell script. I've never actually considered the performance implications of using SSH over NRPE. I'm not too bothered about the load hit on the Nagios server (It's probably over-speced for what it does, it's never been over 10% CPU), but we run each remote check every 30 seconds and each server has 5 different checks performed. I assume SSH requires more resources for each check but is there a huge difference? (I.E. enough of a difference to warrant the switch to NRPE). If it's any help, we monitor a mix of physical servers (Normally with 8, 12 or 16 physical cores) and Amazon EC2 medium/large instances.

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• How to remove bad disk from LVM2 with the less data loss on other PVs?

  - by Walkman

  I had a LVM2 volume with two disks. The larger disk became corrupt, so I cant pvmove. What is the best way to remove it from the group to save the most data from the other disk? Here is my pvdisplay output: Couldn't find device with uuid WWeM0m-MLX2-o0da-tf7q-fJJu-eiGl-e7UmM3. --- Physical volume --- PV Name unknown device VG Name media PV Size 1,82 TiB / not usable 1,05 MiB Allocatable yes (but full) PE Size 4,00 MiB Total PE 476932 Free PE 0 Allocated PE 476932 PV UUID WWeM0m-MLX2-o0da-tf7q-fJJu-eiGl-e7UmM3 --- Physical volume --- PV Name /dev/sdb1 VG Name media PV Size 931,51 GiB / not usable 3,19 MiB Allocatable yes (but full) PE Size 4,00 MiB Total PE 238466 Free PE 0 Allocated PE 238466 PV UUID oUhOcR-uYjc-rNTv-LNBm-Z9VY-TJJ5-SYezce So I want to remove the unknown device (not present in the system). Is it possible to do this without a new disk ? The filesystem is ext4.

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• How is the 137GB limit counted in Virtual PC (two systems on one disk)?

  - by Nux

  I have a dual boot (Win7, XP) physical machine on my old computer which I want to virtualize and move to my new one. So I've uninstalled everything that I can and run shrink from RescueCD (used GParted). Now I have two about 80GiB partitions with a gap between them, so still this seem to be above the given limit. Still the resulting VHD (made with Disk2vhd) is much below the limit (about 110GiB) and both partitions are below the limit. So my question is - is it failing due to the limitations of disk size for VPC or is failing simply because it's a dual boot system. Or maybe it would work if I would move partitions to be close to each other (the gap between them is about 171GB and the whole physical disk is 1TB)?

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• Hyper-V stuck restoring VM

  - by Blax

  I have a hyper-v server that runs 5 virtual machines. I believe the physical box rebooted last night which is usually not a problem but this morning one of the virual machines is stuck at "restoring 0%". I have rebooted the physical machine and same thing, 4 virtual machines come up fine the 5th gets stuck at "restoring 0%". I right-clicked the VM in hyper-v manager and selected "Cancel restore" and nothing happens. I was able to copy the VHD to another hyper-v box and light it up there so I know the VHD is good. Any ideas on what to look at next? If I can I would like to just dump the saved state and move on, or if there is a better way to handle it I'm all ears. TIA!!

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• Multiple subnets behind SonicWall TZ 180

  - by Derek

  We have a SonicWall TZ180 that acts as a VPN endpoint. Right now it has one WAN IP address and a /24 assigned to the LAN interface. Our mail cluster administrator asked if it was possible to add a second private class C behind the VPN. This second subnet would be available to the other network and then we would use address objects and acls to limit access. Is this possible? I read up on PortShield but I don't know if that's what we would need to use because we're pushing all data out of one physical port into a Cisco switch that has VLANs already set up. Addendum: It appears that PortShields will do what I want with only one limitation; it requires a direct 1-1 relationship of portshield to physical port. This would then limit us to 4 PortShields on 1 TZ180. Is there a better solution than this?

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• A space-efficient filesystem for grow-as-needed virtual disks ?

  - by Steve Schnepp

  A common practice is to use non-preallocated virtual disks. Since they only grow as needed, it makes them perfect for fast backup, overallocation and creation speed. Since file systems are usually based on physical disks they have the tendency to use the whole area available1 in order to increase the speed2 or reliability3. I'm searching a filesystem that does the exact opposite : try to touch the minimum blocks need by an aggressive block reuse. I would happily trade some performance for space usage. There is already a similar question, but it is rather general. I have very specific goal : space-efficiency. 1. Like page caching uses all the free physical memory 2. Canonical example : online defragmentation 3. Canonical example : snapshotting

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• Query Performance Degrades with High Number of Logical Reads

  - by electricsk8

  I'm using Confio Ignite8 to derive this information, and monitor waits. I have one query that runs frequently, and I notice that on some days there is an extremely high number of logical reads incurred, +300,000,000 for 91,000 executions. On a good day, the logical reads are much lower, 18,000,000 for 94,000 executions. The execution plan for the query utilizes clustered index seeks, and is below. StmtText |--Nested Loops(Inner Join, OUTER REFERENCES:([f].[ParentId])) |--Clustered Index Seek(OBJECT:([StructuredFN].[dbo].[Folder].[PK_Folders] AS [f]), SEEK:([f].[FolderId]=(8125)), WHERE:([StructuredFN].[dbo].[Folder].[DealId] as [f].[DealId]=(300)) ORDERED FORWARD) |--Clustered Index Seek(OBJECT:([StructuredFN].[dbo].[Folder].[PK_Folders] AS [p]), SEEK:([p].[FolderId]=[StructuredFN].[dbo].[Folder].[ParentId] as [f].[ParentId]), WHERE:([StructuredFN].[dbo].[Folder].[DealId] as [p].[DealId]=(300)) ORDERED FORWARD) Output from showstatistics io ... Table 'Folder'. Scan count 0, logical reads 4, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0. Any ideas on how to troubleshoot where these high logical reads come from on certain days, and others nothing?

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• What is Paging in memory management?

  - by Fasih Khatib

  I was just reading Operating System Principles by Silberschatz et al when I came across paging in memory management.I'm slightly confused about it. It states that Physical Memory(I assume it's RAM) is divided into frames, and logical memory is divided into pages. CPU generates logical addresses containing page number and an offset. This page number is used to retrieve the frame number from a page table which gives the base address so the physical address is calculated as base+offset. My question is: is the page table maintained for every process? I logically think that the answer would be yes as every process will need to map its own pages to frames. I may be wrong. Please clarify. Also: paging and segmentation(where 'holes' are created in memory) are two totally different techniques that are not used in combination. Correct?

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• How do I troubleshoot a page not found error when configuring IIS6 Windows Server 2003? [Page Not Found]

  - by Vinicius Ottoni

  I have configured IIS6 in my windows server 2003 with this link: http://www.simongibson.com/intranet/iis6/ After that I create a new web site inside Web Sites directory. Inside the physical path I created an index.htm that has: <html> <body>Test</body> </html> But I got the following error: "The page cannot be found". When I put the same index file inside the Web Site Default physical path, it works. I configured the new web site with the link above using the IP configuration and without a Host Header.' What should I do to troubleshoot this or is there an obvious configuration error?

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• Which simple server virtualization solution to use?

  - by vvanscherpenseel

  For one part of our hosting platform we are currently using VMware Server 2 to create two virtual machines on one physical machine. One VM is used for hosting of small websites, the other VM is used as a staging environment. Both the host OS and guest OSes run CentOS Linux. Support for VMWare Server 2 has been discontinued and we are currently looking for a replacement. We only use basic functionality (we don't use snapshots, moving around VMs to different physical machines, or other 'advanced' functionality'). Just a box, with two VMs. We are looking for a virtualization solution that has long-term support, is stable and allows configuration/management from Mac OSx (I understood that Xen only has a Windows client). What would be the right solution for us?

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• Workstation Build: Single 2.66ghz i-7 with overclock potential, OR Dual 5520 2.26ghz Xeons?

  - by jdc0589

  There are probably better places to ask this, but I am used to the excellent quality of responses on stack overflow. I am rebuilding my desktop in a few months. Aside from normal lightweight internet usage, I use it to run sqlServer, mySql, 1-2 Ubuntu VMs from time to time, lots of IDE's, and a media server for my PS3. The two possible setups cost the exact same amount (within $50) and would both have 12gb 1333mhz ddr3 ram and a 500gb RAID-0 array (250x2). Now, If I go with a single i-7 920 2.66ghz quadcore, I can easily overclock it to 3ghz, and would have cash leftover to get a 160gb ssd (either the ocz vertex or the 120gb intel) for the main OS/Program install drive. Else, I could get a dual lga1366 motherboard with two e5520 Xeon's (2.26ghz),just use the disks I already have. So, do I go for 8 physical/16 virtual cores at 2.26ghz (No overclocking on server boards) with normal disk I/O, or a 4 physical/8 virtual cores at 3.0ghz with really outstanding disk I/O?

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• Software to create a virtual parallel port in Windows XP?

  - by drknexus

  I am writing a program that will eventually be used on a computer with a physical parallel port and will need to set certain pins high or low in order to signal to an external device. However, the development laptop I am using does not have any physical parallel ports and is too low powered to run a virtual machine. Is there any option available that will create a virtual parallel port within Windows XP? Ideally it would include a debug mode that would allow me to see what values have been pushed out on the parallel port.

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• arp across subnets which devices can be detected?

  - by Gobliins

  i have some devices connected in the same physical network (LAN) but in different subnets. I want to detect them all with the ARP from my computer. My Computer is also in the same physical network but on a different subnet. ! The devices have no arp protocol installed (yet). Is it possible to detect the devices (with or withour ARP installed on every device)? If the devices have a MAC-address but no IP-address, can ARP still detect the machines?

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• Win 7: How can I resize a window to make it much bigger than my screen?

  - by RexE

  I have a window that I'd like to make much bigger than my physical screen (explanation of why below). I hit Alt+Space, M, and then press the Up arrow to move the title bar above the physical top of my screen. However, when I press Enter to set it, the title bar snaps back to the top of my screen. How can I prevent this from happening? Background: I want to get a hi-res image of a neighborhood map so that it can be printed to a poster. Google Earth has a "Save as JPG" feature, which will save the map in the window to a file. The bigger the window, the bigger the JPG; so, I'm trying to make the window as big as I can. Alternate suggestions welcome.

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• vSwitch configuration with 12 uplinks

  - by Joshua

  I have been doing a lot of research on vSwitch configurations, but I think I am more confused now after all of the reading that I have done. So here is my situation 3 ESX Hosts (12 nics each), 1 iSCSI SAN, 2 Force 10 switches. Should I create individual vSwitches for MGMT, vMotion, VM, and SCSI traffic? or do I need to group anything together in the same vSwitch? I am going to have 4 vLANS total, one for each of those items, do I need to do any trunking on the physical switch or just assign the correct vLAN to each physical switch port?

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• Vmware Workstation 10 connect remote server (Debian, Guest-Windows XP) Does not allow raw disk access nor shared folders

  - by Alex

  The setup: Ubuntu with local Vmware Workstation 10 (everything works locally) Connects(File- Connect to Server) Debian server with the same Vmware Workstation 10 (Windows XP Guest) Debian setup does not allow raw disk access nor shared folders (most options does not exist) No shared folder No physical disk option I use root user for this machine. Default install. I've tried to add shared folder from command line - it does not work. How to enable shared folders or raw disk access? I have created new Windows 8 64 bit template from scratch - I cannot use physical HDD either, and no SharedFolder option. I think this is something about security policy of remote server.

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• Hosting ESXI (free edition) [closed]

  - by Peter Adss

  We currently have one physical server running the free version of VMWare ESXi that virtualizes a Win SBS 2003 server and a Citrix server. We need to collocate the server and are investigating our options. Are there places that will host our virtual servers and save us the expense of shipping the physical server out for collocation. In my mind we'd copy the Vms to disk and ship them out. Does the fact that we're using the free version of ESXi create a barrier to this idea? Thanks for the help, I realize this is a stupid question.

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• Open Source or Low Cost Layer 7 ("Content") Switch?

  - by Rob

  I have several web servers that host a number of different applications and web sites. I want to make it easy to host apps or parts of web sites on different servers (e.g. example.com/foo might be on one physical server and example.com/bar might be on another). We do this Apache redirects right now, but that gets messy fast and in any case we have other problems we want to solve, such as throttling requests from individual clients, and reducing dependency on specific physical hosts. Is there an open source or low cost layer 7 switch that would be suitable for this sort of task? I was hoping to find something like a stripped down Linux VMware guest/appliance built for this purpose, but haven't seen anything suitable out there so far.

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