Redhat 6.3 on Hyper-V, "SRAT: Hotplug area too small" at boot

Hello Guys,
After installing Linux Redhat 6.3 on Hyper I receive this message at boot of the Linux virtual machine:
SRAT: Hotplug area too small
Can anyone help understand this message and how to resolve.
Thank you in advance.
Regards
Raymond TODO

Hi Michael,
Thank you for your answer. Just in case you need them, please find below the information you requested in your previous post.
What version of Hyper-V are you running? (2008, 2008 R2, 2012, 2012 R2):
Answer: Core Windows 2008 R2 Hyper V
How much memory is configured in the VM?:
Answer: 16Gb
And how many vCPUs?
Answer: 4
How did you install RHEL 6.3? From the installation ISO? Or by copying a VHD that already had RHEL 6.3 in it?:
Answer:  From ISO
If from the RHEL 6.3 ISO, then the Linux Integration Services (LIS) are not already installed. If from a cloned VHD, then the LIS might already be installed. So what I'm really wanting to know is if the LIS is installed.
Answer: Yes, I installed the LIS v3.4 after the RHEL 6.3 installation
Thank you again for your assistance.
Regards
Raymond TODO

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    Each server is configured with 2 1Gb nics teamed via a virtual switch, now when I copt files between server 1 and 2 for example I see 100MBs throughput, but if I copy a file to server 3 at the same time the file copy load splits the 100MBs throughput between
    the 2 copy processes. I was under the impression if I copied 2 files to 2 totally different servers the load would basically be split across the 2 nics effectively giving me 2Gbs throughput but this does not seem to be the case. I have played around with tcpip
    large send offloads, jumbo packets, disabled vmq on the cards, they are broadcoms. :-(  but it doesn't really seem to make a difference with all of these settings.
    The other issue is If I live migrate a 12Gb vm machine running only 2gb ram, effectively just an o/s it takes between 15 to 20 minutes to migrate, I have played around with the advanced settings, smb, compression, tcpip not real game changers, BUT if I shut
    town the vm and migrate it, it takes, just under 3 and a half minutes to move across.
    I am really stumped here, I am busy in a test phase of hyper-v but cant find any definitive documents relating to this stuff.

    Hi Mark,
    The servers (hyper-v 2012 r2) are all basically configured with ssvmm2012R2 where they all have teamed 1Gb pNics, into a virtual switch, then there are vNics for the Vmcloud, live migration etc.  The physical network is 2 Netgear Gs724T switches which
    are interlinked and each servers 1st nic is plugged into the switch1 and the second nic is plugged into the switch2.See Below Image)  The hyper-v port is set to independent Hyper-v load balancing. 
    The R320 servers are running raid 5 sas drives, the R210s have 1Tb drives mirrored.  The servers all are using DAS storage, we have not moved to looking at using iscsi and san is out the question at the moment.
    I am currently testing between 2x 320s and 2x R210s, I am not copying data to the vm's yets, I am basically testing the transfer between the actual hosts at the moment by copying a 4Gb file manually, After testing the live migrations I decided to test to
    see the transfer rates between the servers first, I have been playing around with the offload settings and rss, what I don't understand is yesterday, the copy between the servers was running up to 228Mbs ie (using both nics) when copying
    the file between the servers, and then a few hours later it only was copying at 50/60Mbs, but its now back at 113Mbs seemingly to be only using one nic.
    I was under the impression if you copy a file between 2 servers the nicks could use the 2gb bandwidth, but after reading many posts they say only one nic, so how did the copies get up to 2Gb yesterday. Then again if you copy files between 3 servers, then
    each copy would use one nic, basically giving you 2Gbs, but this is again not being seen.
    Regards Keith

  • Online Backup of supported Linux VM on Hyper-V 2012 R2 / SC DPM 2012 R2

    Hi,
    I'm trying to set up a lab environment:
    Win 2012 R2 with Hyper-V
    running 2 Linux Machines:
    Linux2 - CentOS 6.4 with manually installed Linux Integration services 3.4
    Linux3 - CentOS 6.4 without LIS (should be already included in CentOS)
    Another machine running Win 2012 R2 Server with SC DPM 2012 R2
    but both VMs show as "Offline" when trying to back them up via DPM. Tried local Windows Server Backup with the same result.
    I am able to backup the VMs "offline" (pausing the VM, taking snapshot, resume VM) but according to MS, SC DPM 2012 R2 should be able to do Online backups for supported Linux VMs (http://blogs.technet.com/b/virtualization/archive/2013/07/24/enabling-linux-support-on-windows-server-2012-r2-hyper-v.aspx)
    The only things in the EventLog are these:
    A storage device in 'Linux3' loaded but has a different version from the server.  Server version 6.0  Client version 4.2 (Virtual machine ID 4F5CDDD8-B855-41CF-83B2-772C1B99090D). The device will work, but this is an unsupported configuration.
    This means that technical support will not be provided until this problem is resolved. To fix this problem, upgrade the integration services. To upgrade, connect to the virtual machine and select Insert Integration Services Setup Disk from the Action menu.
    Any Ideas ?
    Thanks

    Hi,
    That list would need to come from the Windows hyper-v group, they are responsible with adding the feature to the integration components for various Linux OSes.  DPM just backs up whatever the hyper-V writer presents to us, if the guest supports
    online, we back it up online, if not hyper-V saves the guest before the VSS snapshot is taken and DPM takes the backup from the saved state.
    NEW NOTE ADDED 1-29-14: Windows group just released “Linux Integration Services Version 3.5 for Hyper-V”. The
    document mentions that some versions of Red Hat and CentOS are now
    supported to do online backup.
    Live virtual machine backup support
    ======================
    RHEL/CentOS 6.0-6.3
    RHEL/CentOS 5.7-5.8
    RHEL/CentOS 5.5-5.6
    ADDTL NOTES: If there are open file handles during a live virtual machine backup operation, the backed-up virtual hard disks (VHDs) might have to undergo a file system consistency check (fsck) when restored.
    Live backup operations can fail silently if the virtual machine has an attached iSCSI device or a physical disk that is directly attached to a virtual machine (“pass-through disk”).
    Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread. Regards, Mike J. [MSFT] This
    posting is provided "AS IS" with no warranties, and confers no rights.

  • Hyper V on Win 8.1 Pro - can you use a wireless nic or does it need to be ethernet

    On my desktop with win 8.1 pro i installed win 8.1 pro on hyper v as we are going over this chapter in school. i got it loaded just fine but when i start it up I have no internet on the virtual 8.1 pro OS. My desktop uses a wireless nic and I'm wondering
    if this is the problem. I was able to get it to work once, but when I shut it down I no longer had an internet connection on the host OS. So i went in and removed the virtual switch and that did it - now i have internet on my desktop but when i turned the
    virtual machine back on, created the virtual switch again - no internet on virtual machine. I have a feeling I'm configuring something wrong - I will probably find out monday at school but decided to post here because it is bugging me!
    Any help is greatly appreciated
    S Vender

    FYI  - you should not need to perform the wireless sharing that is outlined in the article in the link provided.
    You should only need to select the wireless adapter as the physical adapter associated with your External Virtual Network.
    The internet sharing that folks do is only necessary in a very small number of cases due to router issues or wireless NIC driver issues.
    Brian Ehlert
    http://ITProctology.blogspot.com
    Learn. Apply. Repeat.

  • Windows 8.1 Hyper-V virtualization rights

    So in Windows 7 Pro we had XP mode.  It was a full copy of XP which was licensed under the Windows 7 Pro license.  Do I have the licensing rights to install Windows 7 Pro on my Windows 8/8.1 machine using Hyper-V?
    Quite often my company uses XP mode to run 16 bit applications, or apps that just seem to work better on a 32 bit system, but I really don't want to have to keep getting Windows 7 machines when 8/8.1 works fine except for these old apps which I need an older/32
    bit system.

    Hi,
    The Windows 8 x86 can run the 16-bit application， please refer to the following link.
    http://social.technet.microsoft.com/forums/windows/en-US/d03a56cb-0039-42b7-962d-a389caab99f9/installing-windows-8-32bit
    I don’t think you have the license right of the Windows 7 Pro in Windows 8 Hyper-v, if you don’t buy it.
    Please refer to the license agreement as follow.
    http://download.microsoft.com/Documents/UseTerms/Windows_8_English_ca383862-45cf-467e-97d3-386e0e0260a6.pdf
    Additionally, if you install the Windows 7 in Hyper-v, you will not be able to use XP mode, because XP mode is a vitual mode and the Hyper-v is a virtual machine.
    You can't use vitual mode in a virtual machine. Please refer to the following link.
    http://social.technet.microsoft.com/forums/windows/en-US/78578f0d-4891-4bbf-8bbb-6b9eb05bc031/want-to-run-xp-mode-on-windows-7-vm-on-hyper-v
    If there are any problems, please let me know.
    Best regards

  • Windows Server 2012 - Hyper-V - Cluster Sharded Storage - VHDX unexpectedly gets copied to System Volume Information by "System", Virtual Machines stops respondig

    We have a problem with one of our deployments of Windows Server 2012 Hyper-V with a 2 node cluster connected to a iSCSI SAN.
    Our setup:
    Hosts - Both run Windows Server 2012 Standard and are clustered.
    HP ProLiant G7, 24 GB RAM. This is the primary host and normaly all VMs run on this host.
    HP ProLiant G5, 20 GB RAM. This is the secondary host that and is intended to be used in case of failure of the primary host.
    We have no antivirus on the hosts and the scheduled ShadowCopy (previous version of files) is switched off.
    iSCSI SAN:
    QNAP NAS TS-869 Pro, 8 INTEL SSDSA2CW160G3 160 GB i a RAID 5 with a Host Spare. 2 Teamed NIC.
    Switch:
    DLINK DGS-1210-16 - Both the network cards of the Hosts that are dedicated to the Storage and the Storage itself are connected to the same switch and nothing else is connected to this switch.
    Virtual Machines:
    3 Windows Server 2012 Standard - 1 DC, 1 FileServer, 1 Application Server.
    1 Windows Server 2008 Standard Exchange Server.
    All VMs are using dynamic disks (as recommended by Microsoft).
    Updates
    We have applied the most resent updates to the Hosts, VMs and iSCSI SAN about 3 weeks ago with no change in our problem and we continually update the setup.
    Normal operation:
    Normally this setup works just fine and we see no real difference in speed in startup, file copy and processing speed in LoB applications of this setup compared to a single host with two 10000 RPM Disks. Normal network speed is 10-200 Mbit, but occasionally
    we see speeds up to 400 Mbit/s of combined read/write for instance during file repair.
    Our Problem:
    Our problem is that for some reason a random VHDX gets copied to System Volume Information by "System" of the Clusterd Shared Storage (i.e. C:\ClusterStorage\Volume1\System Volume Information).
    All VMs stops responding or responds very slowly during this copy process and you can for instance not send CTRL-ALT-DEL to a VM in the Hyper-V console, or for instance start task manager when already logged in.
    This happens at random and not every day and different VHDX files from different VMs gets copied each time. Some time it happens during daytime wich causes a lot of problems, especially when a 200 GB file gets copied (which take a lot of time).
    What it is not:
    We thought that this was connected to the backup, but the backup had finished 3 hours before the last time this happended and the backup never uses any of the files in System Volume Information so it is not the backup.
    An observation:
    When this happend today I switched on ShadowCopy (previous files) and set it to only to use 320 MB of storage and then the Copy Process stopped and the virtual Machines started responding again. This could be unrelated since there is no way to see
    how much of the VHDX that is left to be copied, so it might have been finished at the same time as I enabled  ShadowCopy (previos files).
    Our question:
    Why is a VHDX copied to System Volume Information when scheduled ShadowCopy (previous version of files) is switched off? As far as I know, nothing should be copied to this folder when this functionis switched off?
    List of VSS Writers:
    vssadmin 1.1 - Volume Shadow Copy Service administrative command-line tool
    (C) Copyright 2001-2012 Microsoft Corp.
    Writer name: 'Task Scheduler Writer'
       Writer Id: {d61d61c8-d73a-4eee-8cdd-f6f9786b7124}
       Writer Instance Id: {1bddd48e-5052-49db-9b07-b96f96727e6b}
       State: [1] Stable
       Last error: No error
    Writer name: 'VSS Metadata Store Writer'
       Writer Id: {75dfb225-e2e4-4d39-9ac9-ffaff65ddf06}
       Writer Instance Id: {088e7a7d-09a8-4cc6-a609-ad90e75ddc93}
       State: [1] Stable
       Last error: No error
    Writer name: 'Performance Counters Writer'
       Writer Id: {0bada1de-01a9-4625-8278-69e735f39dd2}
       Writer Instance Id: {f0086dda-9efc-47c5-8eb6-a944c3d09381}
       State: [1] Stable
       Last error: No error
    Writer name: 'System Writer'
       Writer Id: {e8132975-6f93-4464-a53e-1050253ae220}
       Writer Instance Id: {7848396d-00b1-47cd-8ba9-769b7ce402d2}
       State: [1] Stable
       Last error: No error
    Writer name: 'Microsoft Hyper-V VSS Writer'
       Writer Id: {66841cd4-6ded-4f4b-8f17-fd23f8ddc3de}
       Writer Instance Id: {8b6c534a-18dd-4fff-b14e-1d4aebd1db74}
       State: [5] Waiting for completion
       Last error: No error
    Writer name: 'Cluster Shared Volume VSS Writer'
       Writer Id: {1072ae1c-e5a7-4ea1-9e4a-6f7964656570}
       Writer Instance Id: {d46c6a69-8b4a-4307-afcf-ca3611c7f680}
       State: [1] Stable
       Last error: No error
    Writer name: 'ASR Writer'
       Writer Id: {be000cbe-11fe-4426-9c58-531aa6355fc4}
       Writer Instance Id: {fc530484-71db-48c3-af5f-ef398070373e}
       State: [1] Stable
       Last error: No error
    Writer name: 'WMI Writer'
       Writer Id: {a6ad56c2-b509-4e6c-bb19-49d8f43532f0}
       Writer Instance Id: {3792e26e-c0d0-4901-b799-2e8d9ffe2085}
       State: [1] Stable
       Last error: No error
    Writer name: 'Registry Writer'
       Writer Id: {afbab4a2-367d-4d15-a586-71dbb18f8485}
       Writer Instance Id: {6ea65f92-e3fd-4a23-9e5f-b23de43bc756}
       State: [1] Stable
       Last error: No error
    Writer name: 'BITS Writer'
       Writer Id: {4969d978-be47-48b0-b100-f328f07ac1e0}
       Writer Instance Id: {71dc7876-2089-472c-8fed-4b8862037528}
       State: [1] Stable
       Last error: No error
    Writer name: 'Shadow Copy Optimization Writer'
       Writer Id: {4dc3bdd4-ab48-4d07-adb0-3bee2926fd7f}
       Writer Instance Id: {cb0c7fd8-1f5c-41bb-b2cc-82fabbdc466e}
       State: [1] Stable
       Last error: No error
    Writer name: 'Cluster Database'
       Writer Id: {41e12264-35d8-479b-8e5c-9b23d1dad37e}
       Writer Instance Id: {23320f7e-f165-409d-8456-5d7d8fbaefed}
       State: [1] Stable
       Last error: No error
    Writer name: 'COM+ REGDB Writer'
       Writer Id: {542da469-d3e1-473c-9f4f-7847f01fc64f}
       Writer Instance Id: {f23d0208-e569-48b0-ad30-1addb1a044af}
       State: [1] Stable
       Last error: No error
    Please note:
    Please only answer our question and do not offer any general optimization tips that do not directly adress the issue! We want the problem to go away, not to finish a bit faster!

    Hallo Lawrence!
    Thankyou for youre reply, some comments to help you and others who read this thread:
    First of all, we use Windows Server 2012 and the VHDX as I wrote in the headline and in the text in my post. We have not had this problem in similar setups with Windows Server 2008 R2, so the problem seem to be introduced in Windows Server 2012.
    These posts that you refer to seem to be outdated and/or do not apply to our configuration:
    The post about Dynamic Disks:
    http://technet.microsoft.com/en-us/library/ee941151(v=WS.10).aspx is only a recommendation for Windows Server 2008 R2 and the VHD format. Dynamic VHDX is indeed recommended by Microsoft when using Windows Server 2012 (please look in the optimization guide
    for Windows Server 2012).
    Infact, if we use fixed VHDX then we would have a bigger problem since fixed VHDX are generaly larger then Dynamic Disks, i.e. more data would be copied and that would take longer time = the VMs would be unresponsive for a longer time.
    The post "What's the deal with the System Volume Information folder"
    http://blogs.msdn.com/b/oldnewthing/archive/2003/11/20/55764.aspx is for Windows XP / Windows Server 2003 and some things has changed since then. for instance In Windows Server 2012, Shadow Copies cannot be controlled by going to Control panel -> System.
    Instead you right-click on a Drive (i.e. a Volume, for instance the C drive/Volume) in Computer and then click "Configure Shadow Copies".
    Windows Server 2008 R2 Backup problem
    http://social.technet.microsoft.com/Forums/en/windowsbackup/thread/0fc53adb-477d-425b-8c99-ad006e132336 - This post is about the Antivirus software trying to scan files used during backup that exists in the System Volume Information folder and we do not
    have any antivirus software installed on our hosts as I stated in my post.
    Comment that might help us:
    So according to “System Volume Information” definition, the operation you mentioned is Volume Shadow Copy. Check event viewer to find Volume Shadow Copy related event logs and post them.
    Why?
    Furhter investigation suggests that a volume shadow copy is somehow created even though the Schedule for Shadows Copies is turned off for all drives. This happens at random and we have not found any pattern. Yesterday this operation took almost all available
    disk space (over 200 GB), but all the disk space was released when I turned on scheduled Shadow Copies for the CSV.
    I therefore draw these conclusions:
    The CSV Volume has about 600 GB of disk space and since Volume Shadows Copy used 200 GB, or about 33% of the disk space, and the default limit is 10% then I conclude that for some reason the unscheduled Volume Shadow Copy did not have any limit (or ignored
    the limit).
    When I turned on the Schedule I also change the limit to the minimum amount which is 320 MB and this is probably what released the disk space. That is, the unscheduled Volume Shadow Copy operation was aborted and it adhered to the limit and deleted the
    Volume Shadow Copy it had taken.
    I have also set the limit for Volume Shadow Copies for all other volumes to 320 MB by using the "Configure Shadow Copies" Window that you open by right clicking on a drive (volume) in Computer and then selecting "Configure Shadow Copies...".
    It is important to note that setting a limit for Shadow Copy Storage, and disabaling the Schedule are two different things! It is possible to have unlimited storage for Shadow Copies when the Schedule is disabled, however I do not know if this was the case
    Before I enabled Shadow Copies on the CSV since I did not look for this.
    I now have defined a limit for Shadow Copy Storage to 320 MB on all drives and then no VHDX should be copied to System Volume Information since they are all larger than 320 MB.
    Does this sound about right or am I drawing the wrong conclusions?
    Limits for Shadow Copies:
    Below we list the limits for our two hosts:
    "Primary Host":
    C:\>vssadmin list shadowstorage
    vssadmin 1.1 - Volume Shadow Copy Service administrative command-line tool
    (C) Copyright 2001-2012 Microsoft Corp.
    Shadow Copy Storage association
       For volume: (\\?\Volume{e3ad7feb-178b-11e2-93e8-806e6f6e6963}\)\\?\Volume{e3ad7feb-178b-11e2-93e8-806e6f6e6963}\
       Shadow Copy Storage volume: (\\?\Volume{e3ad7feb-178b-11e2-93e8-806e6f6e6963}\)\\?\Volume{e3ad7feb-178b-11e2-93e8-806e6f6e6963}\
       Used Shadow Copy Storage space: 0 bytes (0%)
       Allocated Shadow Copy Storage space: 0 bytes (0%)
       Maximum Shadow Copy Storage space: 320 MB (91%)
    Shadow Copy Storage association
       For volume: (E:)\\?\Volume{dc0a177b-ab03-44c2-8ff6-499b29c3d5cc}\
       Shadow Copy Storage volume: (E:)\\?\Volume{dc0a177b-ab03-44c2-8ff6-499b29c3d5cc}\
       Used Shadow Copy Storage space: 0 bytes (0%)
       Allocated Shadow Copy Storage space: 0 bytes (0%)
       Maximum Shadow Copy Storage space: 320 MB (0%)
    Shadow Copy Storage association
       For volume: (G:)\\?\Volume{f58dc334-17be-11e2-93ee-9c8e991b7c20}\
       Shadow Copy Storage volume: (G:)\\?\Volume{f58dc334-17be-11e2-93ee-9c8e991b7c20}\
       Used Shadow Copy Storage space: 0 bytes (0%)
       Allocated Shadow Copy Storage space: 0 bytes (0%)
       Maximum Shadow Copy Storage space: 320 MB (3%)
    Shadow Copy Storage association
       For volume: (C:)\\?\Volume{e3ad7fec-178b-11e2-93e8-806e6f6e6963}\
       Shadow Copy Storage volume: (C:)\\?\Volume{e3ad7fec-178b-11e2-93e8-806e6f6e6963}\
       Used Shadow Copy Storage space: 0 bytes (0%)
       Allocated Shadow Copy Storage space: 0 bytes (0%)
       Maximum Shadow Copy Storage space: 320 MB (0%)
    C:\>cd \ClusterStorage\Volume1
    Secondary host:
    C:\>vssadmin list shadowstorage
    vssadmin 1.1 - Volume Shadow Copy Service administrative command-line tool
    (C) Copyright 2001-2012 Microsoft Corp.
    Shadow Copy Storage association
       For volume: (\\?\Volume{b2951138-f01e-11e1-93e8-806e6f6e6963}\)\\?\Volume{b2951138-f01e-11e1-93e8-806e6f6e6963}\
       Shadow Copy Storage volume: (\\?\Volume{b2951138-f01e-11e1-93e8-806e6f6e6963}\)\\?\Volume{b2951138-f01e-11e1-93e8-806e6f6e6963}\
       Used Shadow Copy Storage space: 0 bytes (0%)
       Allocated Shadow Copy Storage space: 0 bytes (0%)
       Maximum Shadow Copy Storage space: 35,0 MB (10%)
    Shadow Copy Storage association
       For volume: (D:)\\?\Volume{5228437e-9a01-4690-bc40-1df85a0e6736}\
       Shadow Copy Storage volume: (D:)\\?\Volume{5228437e-9a01-4690-bc40-1df85a0e6736}\
       Used Shadow Copy Storage space: 0 bytes (0%)
       Allocated Shadow Copy Storage space: 0 bytes (0%)
       Maximum Shadow Copy Storage space: 27,3 GB (10%)
    Shadow Copy Storage association
       For volume: (C:)\\?\Volume{b2951139-f01e-11e1-93e8-806e6f6e6963}\
       Shadow Copy Storage volume: (C:)\\?\Volume{b2951139-f01e-11e1-93e8-806e6f6e6963}\
       Used Shadow Copy Storage space: 0 bytes (0%)
       Allocated Shadow Copy Storage space: 0 bytes (0%)
       Maximum Shadow Copy Storage space: 6,80 GB (10%)
    C:\>
    There is something strange about the limits on the Secondary host!
    I have not in any way changed the settings on the Secondary host and as you can see, the Secondary host has a maximum limit of only 35 MB storage on the CSV, but it also shows that this is 10% of the Volume. This is clearly not the case since 10% if 600
    GB = 60 GB!
    The question is, why does it by default set a too small limit (i.e. < 320 MB) on the CSV and is this the cause of the problem? I.e. is the limit ignored since it is smaller than the smallest amount you can provide using the GUI?
    Is the default 35 MB maximum Shadow Copy limit a bug, or is there any logical reason for setting a limit that according to the GUI is too small?

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