SAN LUNS vs. VMFS Block Size block size

Similar Questions

• change the block size to SAN LUNS?

  is it possible that I can change the size of the block on a SAN LUN (whether SATA, iSCSI or fiber) with the help of a vCenter?  If not, what is the way to do it?  Or, our administrator SAN should do?

  It is easier in vcenter - once the vmfs data store has been deleted data from the data store vmfs to remove and re-create it with the correct size of the block.

  If you find this or any other answer useful please consider awarding points marking the answer correct or useful

• Question of size for VMFS block

  I created a 600 GB LUN. Then I go to the ESX host that contains the data - tab Configuration - Storage store - select the data store.

  Why does say that my 600GB LUN is a block size of 8? When I create a 600 GB LUN, should not be a block size of 4?

  He said that my VMFS filesystem is 3.46.

  I'm under vCenter 5.0 with ESXi 4.1

  Thank you

  I created the data store via my interface EMC e 3100

  I ' don't know this interface, but this could create the data store with a block size of 8MB. In any case, there is basically nothing wrong with the block size of 8MB. You don't have a degradation in performance compared to a different block size.

  André

• MSCS with a RDM SAN LUN

  I'm building a Microsoft Cluster with two VM on the physical host computers separate servers.  Based on what I have read so far using a RDM SAN LUN is supported when the cluster nodes are on separate host servers.  VMFS formatted SAN LUNS are not supported when the nodes are on separate host servers.

  If I have I need of several shared volumes, the only commune RDM LUN can cause several volumes in windows or each shared volume is associated with a RDM LUN?

  ESXi 5.0

  Windows Server Standard 2008 R2 x 64-cluster nodes

  Welcome to the community,

  usually, you would create a volume on a LUN (essentially identical with the physical installation of MSCS). Having multiple volumes on a single LUN would make not much sense anyway, because MSCS can not move LUN between nodes (i.e. only a single cluster node can be the owner/Defender).

  André

• How to add SAN LUN in ESX of CLI?

  Hello people,

  I work for a team of engineers to implementation, where our tasks involve the construction of about 15 bunches per month.

  As part of build tasks, we end up consuming more time add the SAN LUN in the ESX servers all running ESX 4.1 through the Victoria Cross.

  I understand that the vmkfstools command could help us create a partition vmfs3 on the LUN, but when I do it asks me to set the partition to 0xfb and I believe that we should use the parted for that utility.

  I can't define it with a single command. My goal is to put these commands in a script to speed up the work.

  

  I'm also not sure if the LUN list that I see in the Terminal Server to ESX Server session is the same as what I see in the VCenter. How can I do?

  
  Comparing the two screenshots, I see an additional LUN of the Terminal Server session

  

  Would appreciate any help in this matter.

  Thanks in advance

  Hello

  Take a look on the link below

  http://www.virtu-al.NET/2009/08/28/PowerCLI-mass-provision-datastores/

  And if you work in a team of engineers, I recommend to familiarize themselves with PowerCLI, tool very powerful

  BTW, I remember if you would vmkfstool used for the creation of VMFS, data warehouses will be not aligned LUN pieces that could lead to a deterioration of storage I/O performance

  www.VMware.com/PDF/esx3_partition _align.pdf

  See you soon
  Artur
  

  Please, do not forget the points of call of the "useful" or "correct" answers

• 2 san LUNS have been disassembled automatically need to pull up the same

  Dear Experts,

  last night all of a sudden we found two san LUNS are not mounted on one of the vcb server, but we are able to see the same on a disk management window, need your help how to mount these LUNS without losing any data. How to download buttons pressure or attachment...

  Need urgent help

  concerning

  Mr. VMware

  Hello

  What operating system is installed on the computer?

  Contact VMware support for assistance.

  http://www.VMware.com/support/

  Hope this information helps.

• relocation of esxi start from the san LUN

  I have 1 SG by ESXi host and its start-up dedicated to san lun and other LUN datatore. IF I had to reinstall the host esxi via kickstart, do I need to unmask the LUNS of the SG data store before installing?

  I used to do if Imaging is automated. If I do this since an ISO just be careful. That's what I do.

  My Blog of UCS http://realworlducs.com

• SAN LUN must be disconnected to ESXi 4.1 U3 upgrade?

  Salvation;

  I was wondering if SAN LUN must be separated (registered) during the upgrade of U3 for an ESXi host.

  I did the upgrade on a new host that is not yet in production, and has any HBA inside.

  I just tried on a variety of prod in maintenance mode and it gets to a screen and it shows the LUNS sees it. (see the attached screenshot)

  I know that the local drive is the target, but I want to just make sure that nothing happens on the remote SAN LUNS if I proceed.

  Any info would be great, thanks.

  If I am mistaken, interactively fix/upgrade using the CD is only supported with ESXi 5.0 and newer. In doing so, with the ESXi 4.1 CD, will wipe the installation disc! A method of support for ESXi 4.1 update is for example the vihostupdate command-line utility to apply the patches provided in http://www.vmware.com/patchmgr/download.portal.

  André

  PS: Please consider joining screenshots in format rather than .rtf .jpg files.

  PS2: Issues displayed in communities VMTN (http://communities.vmware.com/community/) rather than in groups generally receive more attention.

• need help to set up a SAN LUN...

  Dear team,

  Today, all of a sudden, we have identified two san LUNS are not mounted on one of the vcb server, but we are able to see the same on a disk management, here is the screenshot window, need your help how to make these existing LUNS without losing any data.

  

  LUNS that are not initialized these r the LUN I want to mount as drive Q and O, and here's event logs

  

  need urgent help

  concerning

  Mr. Vmware

  First, look at the status of logic on the side of SAN unit number.

  The windows machine

  1. make sure that you can see WWPN in the HBA bios.

  2. starting at OS level check LUN status using above commands so Multipathing s/w is installed, Else look for hard drives in the Device Manager (it must be something lik DISK IBM)

  3 simple reboot may go up Mon

• Conversion of a server that has SAN LUNS attached

  Hello

  Need help.

  I need a file server, which currently has 4 mapped to the EVA SAN drives, each drive is almost 1.6 TB of P2V.

  I also have the CD VMware converter acronis.

  How can I get it work? as I'm not able to migrate the attached SAN LUN due to space issues.

  Any help appreciated...

  How can I get it work? as I'm not able to migrate the attached SAN LUN due to space issues.

  You don't need to convert the SAN disks, ignore those.  NPIV can be used to attach these LUNS later once it is converted.

  Use VM Converter, convert JUST the boot disk for the file server.

• SAN LUN mapping

  Hi all

  Just a quick question, in are environment we use ESX 4.0 Update 2. We use a SAN that is connected through fibre channel. I want to know it's possible map SAN LUNS directly to a virtual machine?

  You can do this with NPIV, where your virtual machines get there own virtual fiber HBA and WWN adapters and you then use your San to map LUNS to these WWN. Your esx host must be able to see the SAN for this to work and there are a few prerequisites more.

  Scott Lowe has a good article here: http://blog.scottlowe.org/2009/11/27/understanding-npiv-and-npv/

  and also the configuration of VMware SAN guide.

  Hope this helps,

  Dan

• P2V with the guest who has devoted the fiber SAN LUN connection

  We have a Windows 2003 server that has a SAN LUNS dedicated to her.  It is not shared.  It is only used by this server.   We need to virtualize it but wonder how the dedicated SAN LUNS will be included in the new virtual machine?  Some people in our Department who took the course VMware informs me that there is no way in VI3 for this.  Is this true?

  Looks like he's talking about NPIV that allows each virtual machine to have its own Port.  Discover 86 of the Guide of Fibre Channel SAN Configuration for details.  It would also certainly work.

• ESX host managed by VirtualCenter servers all see the same SAN LUNS / data warehouses

  Scenario of

  I have two separate deployments of VirtualCenter (in the same physical location) VCA and VCB with each deployment management 5 x ESX hosts (10 in total).

  All 10 hosts are allowed to look at the same SAN LUNS / data warehouses?

  Or I have to isolate five VCA hosts and five guests to their own SAN LUNS VCB / data warehouses?

  Box293 wrote:

  Basically, we have our direct environment and we are on the beta program for VI4.

  I want to turn off a virtual machine in the direct environment and then pull it out of the inventory.

  Then I want to go the VI4 Beta and browse the data store and add this virtual machine to inventory.

  These two environments may see the same LUNS / data warehouses.

  I did and it works however I want to make sure that it is an approved practice.

  You can do that normally without any problems. Even if the virtual machine is in a different datacenter inventory and there Powred-Off. You can map the logic unit number on the VI4 and add to the inventory of the VI4 another host.

  Recently, I did this practice to migrate from host with virtual machines in a different subnet to the host who knows the same setting SAN LUN in the other subnet.

  Best regards

  Hussain Al Sayed

• Pointer of RDM / vmfs block size?

  We run ESX 4.0 on Dell R710s connect to a network SAN IBM N-Series on CF.

  This week we had a major outage due to a server RedHat MySQL fall.

  Off firstly the server wouldn't boot past virtual POST-sachant a RDM disk I have it deleted from the configuration. The server would then boot to OS, but every time that the ROW was reconnected it would either fall or unbootable.

  I remembered we had farily recently expanded space on this server and the RDM was now 300 GB in size. However the space used was only 85% on the lun (255GB). Then I remembered the limits of block size. The server was sitting on a partition vmfs with a block size of 1 MB (256GB max). So I removed the RDM and svMotion had the server in a data store that have a block size of 2MB, reconnected the RDM and the server starts very well. After a consistency check DB we were back running.

  This survey of fault, I went to read the document of maximum rates of the white paper

  http://www.VMware.com/PDF/vSphere4/R40/vsp_40_config_max.PDF

  to be honest - had some vague information on RDM

  and then I found VMware KB

  http://KB.VMware.com/selfservice/microsites/search.do?language=en_US & cmd = displayKC & externalId = 1029697

  surprising to me, which clearly states the pointer RDM files are affected by the block vmfs sizes.

  However, there is a difference of opinion in this thread

  http://communities.VMware.com/message/1507498

  And look further in my own environment, we have several production server running with connected RDM which are excessive in size until the limits of said block size.

  I need clarity defined on it because as he sits down we could have several production machines in an unstable state, or I'm just left with no explanation for the disc lock, we witnessed and a power outage that caused a substantial loss of business.

  concerning
  wolfsonmicro

  Post edited by: wolfsonmicro Click accidental - it is always a request without response

  My understanding is that the LUN cannot be greater than the maximum size supported by the data store on that of RDM file pointer is created.  Pointer RDM file does not need to be stored on the same data store, Setup or other files vmdk files, for example you could have moved the file pointer RDM from a store of data with a larger block and left the vmx file and the data store other files vmdk with a block of 1 MB.

  Are you sure that files of pointer RDM for running virtual machines, you have on data with blocksizes warehouses NOT supporting the LUN size they point?

• A procedure to follow to change the block of VMFS Volume size?

  We use a VMFS volume with size of 1 MB blocks.  As the virtual HD size must be greater than 256 GB, to change the size of the block to 2 MB.

  We would like to confirm that the following is correct:

  (1) to migrate all VM this VMFS volume

  (2) delete this VMFS of ESX Cluster

  Add 3) as storage again

  4) format with the 2 MB block size

  Is it Miss?

  Thank you

  There is not another possible procedure

  But as already shown reflect the selection of block size.

  ---

  MCSA, MCTS, VCP, VMware vExpert 2009

  http://blog.vadmin.ru